Iron Analysis using the HACH FerroVer method and a Spec 20

合集下载

小学上册第十一次英语第6单元期末试卷

小学上册英语第6单元期末试卷英语试题一、综合题(本题有50小题，每小题1分，共100分.每小题不选、错误，均不给分)1 What is the name of the nearest large galaxy to the Milky Way?A. Triangulum GalaxyB. Andromeda GalaxyC. Sombrero GalaxyD. Whirpool Galaxy2 What is the name of the famous British rock band known for songs like "Hey Jude"?A. The Rolling StonesB. The WhoC. The BeatlesD. Pink Floyd答案: C. The Beatles3 What is the capital of Haiti?A. Port-au-PrinceB. Cap-HaïtienC. JacmelD. Les Cayes答案: A4 A ______ (植物的生命周期) can be complex.5 A __________ is the young stage of a butterfly.6 My best friend has a ________ (玩具名) that is ________ (形容词). We often trade toys and share our ________ (名词).7 What do you call a person who studies fossils?A. PaleontologistB. GeologistC. ArchaeologistD. All of the above答案:A8 A rainbow is caused by the refraction of ______.9 (Magna Carta) was signed in 1215 to limit the power of the king. The ____10 The boy has a new ________.11 What is the common name for H2O?A. OilB. JuiceC. WaterD. Soda答案:C12 Oceans are deeper than ________.13 What is the longest river in the world?A. AmazonB. NileC. MississippiD. Yangtze答案: B14 My sister likes to draw ____.15 The chemical formula for potassium bromide is _____.16 We have a ______ (愉快的) family day every month.17 The capital of Saint Lucia is __________.18 My friend is __________ (成功的).19 The _____ (大楼) is tall and shiny.20 They are watching a ______. (movie)21 What do we use to measure distance?A. ScissorsB. RulerC. ClockD. Brush22 The ______ is a talented poet.23 What do we call the act of saving something from danger?A. PreservationB. ConservationC. ProtectionD. All of the above答案: D24 I have a _____ (相框) that holds a picture of my family. 我有一个相框，里面放着我家人的照片。

60001-18 5000系列高浓度磷酸盐分析仪60001型仪器操作手册说明书

哈希公司的商标AccuGrow® AccuVac® AccuVer™ AccuVial™Add-A-Test™ AgriTrak™ AluVer®AmVer™APA 6000™ AquaChek™ AquaTrend® BariVer® BODTrak™ BoroTrace™ BoroVer®C. Moore Green™ CA 610™CalVer® ChromaVer® ColorQuik® CoolTrak® CuVer® CyaniVer® Digesdahl® DithiVer®Dr. F. Fluent™ Dr. H. Tueau™ DR/Check™EC 310™ FerroMo® FerroVer® FerroZine® FilterTrak™ 660 Formula 2533™ Formula 2589™ Gelex® H2O University™H2OU™Hach Logo®Hach One®Hach Oval®™HachLink™Hawkeye The Hach Guy™HexaVer®HgEx™HydraVer®ICE-PIC™IncuTrol®Just Add Water™LeadTrak®m-ColiBlue24®ManVer®MolyVer®Mug-O-Meter®NetSketcher™NitraVer®NitriVer®NTrak®OASIS™On Site Analysis.Results You Can Trust SMOptiQuant™OriFlow™OxyVer™PathoScreen™PbEx®PermaChem®PhosVer®Pocket Colorimeter™Pocket Pal™Pocket Turbidimeter™Pond In Pillow™PourRite®PrepTab™ProNetic™Pump Colorimeter™QuanTab®Rapid Liquid™RapidSilver™Ratio™RoVer®sens ion™Simply Accurate SMSINGLET™SofChek™SoilSYS™SP 510™Spec ™StablCal®StannaVer®SteriChek™StillVer®SulfaVer®Surface Scatter®TanniVer®TenSette®Test ‘N Tube™TestYES!SMTitraStir®TitraVer®ToxTrak™UniVer®VIScreen™Voluette®WasteAway™ZincoVer®目录安全防范 (1)规格参数 (3)操作 (5)第一部分一般信息 (6)1.1 仪器描述 (6)1.2 物理设计 (6)1.2.1 控制模块 (6)1.2.2 试剂供给系统 (8)1.2.3 分析模块 (8)1.3 分析方法 (9)1.4 工作原理 (9)第二部分测定仪操作 (11)2.1 测定仪拆箱 (12)2.1.1 检查破损 (12)2.1.2 安装工具包的内容 (12)2.1.3 第一次试剂供给 (12)2.2 启动 (13)2.2.1 安装搅拌棒 (13)2.2.2 制备试剂 (13)2.2.3 安装试剂 (13)2.3 操作 (14)2.3.1 供电 (14)2.3.2 键盘显示描述 (15)2.3.3 使用菜单 (17)2.3.4 检查试剂压力 (17)2.3.5 设置样品压力 (18)2.3.6 首次操作 (19)2.3.7 稳定化时间 (20)2.3.8 初次校准 (20)2.4 进行监测 (21)2.4.1 报警器指示 (21)2.4.2 管道检查 (21)2.4.3 测得的磷酸盐的正常显示 (22)2.5 操作编程 (23)2.6 初始化设置 (23)2.6.1 报警器 (23)2.6.2 试剂 (27)2.6.3 记录仪 (29)2.6.4 记录通讯格式/设置 (33)2.6.5 打印格式 (34)2.6.6 远程输入命令 (36)2.6.7 打印设置 (40)2.6.8 首次设置 (40)2.6.9 键盘锁定 (45)2.7 校准 (47)2.7.1 默认校准 (48)2.7.2 自动校准 (48)2.7.3 用户校准 (51)2.7.4 调用校准值 (51)2.8 测试菜单 (52)2.8.1 报警器测试 (52)2.8.2 记录仪测试 (52)2.8.3 打印机测试 (53)2.8.4 简单采样测试 (54)2.8.5 剩余时间 (55)2.8.6 显示屏测试 (56)2.8.7 试剂压力 (56)2.8.8 样品压力 (57)2.9 报警系统操作 (58)2.9.1 样品浓度报警 (58)2.9.2 测定仪系统报警 (59)2.9.3 系统报警 (60)安装/维护 (63)第三部分安装 (64)3.1 测定仪的位置 (64)3.1.1 环境要求 (64)3.1.2 选择采样点 (64)3.1.3 安装测定仪 (64)3.2 泵管/水力接头 (66)3.2.1 样品调节要求 (66)3.2.2 样品压力调节工具包 (67)3.2.3 样品管线连接 (68)3.2.4 样品管线和阀的清洗 (68)3.2.5 样品排空管线接头 (69)3.2.6 箱体排空/放空管线连接 (70)3.2.7 试剂压力系统 (70)3.2.8 空气吹脱接头 (71)3.2.9 试剂排气接头 (71)3.3 电气连接 (71)3.3.1 电源连接 (72)3.3.2 报警继电器连接 (73)3.3.3 记录仪输出连接 (75)3.3.4 串行接口 (76)第四部分维护要求 (83)4.1 每月的试剂补充 (83)4.1.1 试剂空白 (83)4.1.2 输入新的试剂液位 (84)4.1.3 装填试剂 (84)4.1.4 更改标准溶液液位 (84)4.1.5 检查试剂压力 (84)4.1.6 检查样品调节系统 (84)4.2 每季的比色池清洗 (85)4.3 泄漏装置 (85)4.3.1 检查样品泄漏 (85)4.3.2 寻找试剂泄漏 (85)4.3.3 寻找试剂压力泄漏 (85)4.4 每年的预防性维护 (87)4.4.1 更换比色计灯 (87)4.5 非定时维护流程 (89)4.5.1 试剂泵管模块更换 (89)4.5.2 试剂瓶管更换 (91)4.5.3 样品池更换 (92)4.5.4 样品池盖组件更换 (93)4.5.5 试剂阀更换 (93)4.5.6 样品节流阀更换 (96)4.5.7 熔芯更换 (96)4.5.8 样品池排空管备件 (97)4.5.9 控制模块更换 (97)4.5.10 压力传感器更换 (98)4.5.11 长期关机 (100)第五部分故障排除 (102)5.1 在低浓度条件下的一致性与准确性问题 (102)第六部分备件和附件 (116)备件 (116)其它项目 (117)备用试剂 (119)可选的试剂和附件 (119)附录 (122)分析仪测定与实验室分析的比较 (122)DR/2010型钼钒酸盐方法——反应性磷流程 (122)反应性磷（也称为正磷酸盐）： (123)方法8114——钼钒酸盐方法 (123)采样和保存 (125)准确度检验 (126)精密度 (126)干扰 (126)方法小结 (127)需要的试剂（使用试剂溶液） (127)需要的试剂（使用AccuVac®安瓿） (127)需要的设备（使用试剂溶液） (128)需要的设备（使用AccuVac®安瓿） (128)可选的试剂 (128)可选的设备 (128)一般信息 (130)如何定购.....................................................................................错误！未定义书签。

Influence of rare earth elements on solidification behavior of a high speed steel for roll

JOURNAL OF RARE EARTHS, Vol. 29, No. 11, Nov. 2011, P. 1089Foundation item: Project supported by the NSFC (51071136) and State 863 Projects (2006AA03Z532 and 2010AA03A407)Influence of rare earth elements on solidification behavior of a high speed steel for roll using differential scanning calorimetryWANG Mingjia (⥟ )1, CHEN Lei (䰜䳋)1,2, WANG Zixi (⥟ )1, BAO Er ( 㘇)3(1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China; 2. College of Mechanical and Engineering, Yanshan University, Qinhuangdao 066004, China; 3. College of Electromechanical and Information Engineering, Northeastern University for Nationalities, Dalian 116600, China)Received 18 August 2011; revised 8 September 2011Abstract: The influence of rare earths (RE) on solidification behavior of a high speed steel for roll was investigated by using differential scanning calorimetry (DSC) in combination of microstructure analysis. It was found that the sequence of solidification was L ĺȖ, L ĺȖ+MC, L ĺȖ+M2C, L ĺȖ+M6C, respectively. The start temperature and the latent heat liberated by unit mass of L ĺȖ and L ĺȖ+MC increased with increase of RE addition, indicating that RE could trigger the crystallization of the primary Ȗ and the MC carbide more effectively. The pro-moting effect of RE on the heterogeneous nucleation was believed to be an important cause of this effect. Grain refinement, discontinuous network of eutectic carbides and disperse and finer MC were observed in the samples with RE addition, moreover, RES could act as the het-erogeneous nucleus of the MC. RE addition was favorable for stable M6C at the expense of the metastable M2C. Keywords:high speed steel roll; rare earths; solidification; DSCHigh speed steels (HSSs) with an excellent combination of hardness, wear resistance and high-temperature properties are attractive alternative to conventional hot roll material during rolling process [1,2]. Various complex eutectic carbides which are formed in solidification play dominant role in as-cast HSS rolls. Many efforts have been made to improve the as-cast microstructure through controlling the type, morphology, and volume fraction of carbides [3,4], and the modification method characterized by adding different metal alloys into the molten HSS is an effective approach for this purpose. Rare earths (RE), as reactive elements, not only ex-hibit some similarities to other modifiers, but also display their unique characteristics. So far, several reports have fo-cused on the applications of RE compound modification and the effect of RE on microstructure and properties of HSSs [5–7]. However, there are few investigations on the so-lidification behavior and microstructural response in HSS due to the complexity of modification and the experimental limitation.DSC is a widely used analysis technique which is sensi-tive to thermal variation. It is indeed possible to obtain pre-cise estimates of various thermal transformations by taking proper precautions and ensuring good calibration practices. DSC analysis has been well used to evaluate the solidifica-tion characteristics of alloy steels and nonferrous alloys [8,9]. In this paper, an attempt was made to describe the effect of RE on solidification of a HSS for roll using DSC in combi-nation of microstructure observation. Furthermore, it is pos-sible to obtain a more fundamental understanding of the mechanism of RE in the HSS.1 ExperimentalThe HSS with nominal composition of C (1.5–2.0 wt.%), Cr (4–8 wt.%), W (1–4 wt.%), Mo (3–8 wt.%), V (3–8 wt.%) and Fe in balance was melted in vacuum induction furnace with an argon atmosphere. After deoxidizing with Al and Si-Ca alloy, ferroalloys and RE alloys (RE>98 wt.%) were added to the melt. A series of barrel specimens of size 80 mm×40 mm×140 mm were obtained by horizontal cen-trifugal casting. Specimens were divided into four groups according to different RE additions: HSS0 (RE=0), HSS1 (RE=0.04%), HSS2 (RE=0.08%) and HSS3 (RE=0.12%). DSC measurements were performed using NETZSCH STA-449C thermal analyzer. Small, well-cleaned samples, with approximately the same mass (about 60 mg) and size (ĭ3 mm×5 mm) obtained from four specimens with differ-ent RE additions, were used for DSC experiments. A typical isochronal DSC run employed in the present study was con-ducted as follows: the DSC samples were heated to 1400 ºC at a heating rate of 40 ºC/min and held for 5 min, then cooled to 1100 ºC at 25 ºC/min and subsequently cooled to room temperature at high cooling rate. Base line calibration runs were performed before experiment and a steady argon flow of about 50 ml/min was maintained throughout the experi-ment.1090 JOURNAL OF RARE EARTHS, Vol. 29, No. 11, Nov. 2011Microstructure was examined for assisted analysis by us-ing optical microscopy (OM), scanning electron microscopy (SEM) combined with electron disperse spectrum (EDS). X-ray diffraction (XRD) was used to determine the type of carbides.2 Results and discussion2.1 Analysis of DSC curves during continuous cooling Typical DSC curves of four specimens with different RE additions obtained in the process of cooling schedule are shown in Fig. 1. Four exothermic peaks are delineated in every curve, in which include three distinct peaks and a weaker peak. However, the position of the weaker one is different; in other words, it appears in different temperature ranges. In HSS0, the weak peak is observed in the tempera-ture from 1125 to 1145 ºC (Fig. 1(a)). In other studied steels, the weak peak positions which are seen at about 1160±5 ºC are higher as compared with HSS0, as shown in Fig. 1(b), (c) and (d). The exothermic peaks presented in DSC curves in cooling depend on the exothermic reaction of various phases in solidification[8]. In the case of HSS, they are sensitive to eutectic reactions of all kinds of carbides. Thus, the result on the weaker peak positions suggests that the eutectic reaction of some carbide is influenced by RE addition.The solidification of HSS consists of various exothermic reactions such as the primary į or Ȗ reaction, Ȗ+MC, Ȗ+M2C, Ȗ+M6C, Ȗ+M7C3 eutectic reaction[2]. Fig. 2 shows the quasi-phase diagram calculated by using the Thermo-calc software. The present HSS solidified along the dashed line. It can be seen that the sequence of solidification of test steel is LĺȖ, LĺȖ+MC, LĺȖ+M6C above 1100 ºC. Logically, there should be three peaks for LĺȖ, LĺȖ+MC, LĺȖ+M6C in the DSC curves of test steels, but there are practi-cally four peaks (Fig. 1). In general, the calculated diagram represents equilibrium, in reality, however, the DSC curves, in present work, were obtained in non-equilibrium due to faster cooling rate. According to Ref. [7], M2C, as a metast-able eutectic carbide, which forms earlier than M6C could be observed in HSSs with higher Mo or W content which are approximate composition to those used in this paper. The XRD patterns of HSS0 and HSS3 are shown in Fig. 3. It is found that three types of carbides (MC, M2C and M6C) ex-ist in each sample which is the evidence that can substantiate the presence of M2C. Taking this into account, it can be concluded that the peaks from high to low temperature in the DSC curves of test steels can be described as LĺȖ, LĺȖ+ MC, LĺȖ+M2C, LĺȖ+M6C, respectively. Besides, RE does not change the type of carbides.The start temperatures of primary Ȗ and eutectic reactions obtained from the intersection point of the two tangents on the curve, which could be ascribed to the early stage of various transformations during solidification and the corre-sponding peak areas which could represent the heat of reac-tion liberated by unit mass are shown in Fig. 4. It can be seen that the start temperature of LĺȖ and LĺȖ+MC apparently shifted to the higher temperature range with increase of RE addition, while there is no significant increase in LĺȖ+M2C and LĺȖ+M6C compared with the former two (Fig. 4(a)). The heat of reactions for LĺȖ, LĺȖ+MC, LĺȖ+M6CWANG Mingjia et al.,Influence of rare earth elements on solidification behavior of a high speed steel for roll using (1091)Fig. 2 Quasi-binary phase diagram for M (Fe-5Cr-5Mo-3W-3V)-CsystemFig. 3 X-ray diffraction patterns of HSS0 and HSS3 increases with increase of RE addition, but that of LĺȖ+ M2C is reverse, as shown in Fig. 4(b).As we know, RE inclusions (for instance, Ce2O3) can be regarded as the effective heterogeneous nucleus for the pri-mary Ȗ of Fe-C alloys due to higher melting point and smaller lattice misfit with Ȗ[10]. This could explain why the primary Ȗ is triggered more effectively at higher temperature with increase of RE addition. With the crystallization of primary Ȗ, the heat of reaction would be released. More re-lease of heat of unit mass indicated by more peak areas in samples with RE addition may cause decrease of the cooling rate of the local residual melts, whereby the subsequent eutectic reaction LĺȖ+MC is more close to equilibrium in which the transformation temperatures is higher. That may be one of the possible reasons that RE addition causes in-crease of eutectic temperature of LĺȖ+MC. Similarly, with increase of RE addition, the state of solidification after LĺȖ+MC is in favor of stable M6C and against metastable M2C due to more heat of reaction for LĺȖ+MC. Thus, the peak area of LĺȖ+M6C increases, while that of LĺȖ+ M2C decreases, although both eutectic temperatures change slightly.In the following section, a detailed microstructural inves-tigation was discussed in order to describe the effect of RE addition on the solidification behavior sufficiently.2.2 Analysis of microstructureThe micrographs shown in Fig. 5 exhibit the as-cast mi-crostructure of test steels after the DSC measurement. It can be found that the typical microstructure of four HSSs con-sists of dendrites surrounded by a more or less continuous interdendritic network of eutectic carbides. In HSS0, the grains and the network of eutectic carbides are coarser, as seen in Fig. 5(a). With RE addition increasing, the grains are refined (Fig. 5(b), (c)) and the network of eutectic carbides does not evolve into the continuous configuration, keeping instead a more discontinuous shape, and moreover, the chrysanthemum-like eutectic colonies which consists of coarser rod-shaped MC become more dispersed and finer, especially in HSS3 with 0.12 wt.% RE addition, as shown in Fig. 5(d).As pointed out above, RE can promote the heterogeneous nucleation of the primary Ȗ which is helpful to decrease den-drites arm spacing[11], whereby the dendrites structures are refined and the continuous growth of eutectic carbides can be hindered. On the other hand, some nucleation agents can be regarded as effective heterogeneous nuclei for the eutectic carbides as well, which improves the morphology and dis-tribution of the carbide. Thus, some excellent mechanical properties could be obtained[12–14]. Fig. 6(a) shows the SEM micrograph of the sample HSS3 at higher magnification. It can be found that a white particle embedded in the carbide. The corresponding EDS spectrum at point A in Fig. 6(a) re-veals that C, V, Cr, W, Fe, S and RE elements are present,1092 JOURNAL OF RARE EARTHS, Vol. 29, No. 11, Nov. 2011Fig. 5 Typical solidification microstructures of test steels HSS0 (a), HSS1 (b), HSS2 (c) and HSS3 (d)and the atom ratio of RE and S is close to 1:1, as can be seen in Fig. 6(b). It suggests that the white particle in Fig. 6(a) should be the RES and acts as the heterogeneous nucleus of the MC rich in V and C. This could not only explain the ob-served characteristic in the response of the morphology and distribution of MC carbides, but may be another reason which could be responsible for the starting point of LĺȖ+MC in the DSC curves of samples with RE addition tak-ing place for higher temperature. More importantly, this characteristic of MC implies the importance of the disper-sion technique of modifier.As the eutectic reaction LĺȖ+MC progresses, the content of V element decreases, and the concentration of W, Mo elements which are helpful for the formation of M2C or M6C increases in the residual melts. Thus, the M2C or M6C carbides appear at the boundaries between the liquid and the primary Ȗ/the eutectic Ȗ/the eutectic MC carbides. In that way, these eutectic carbides are distributed along the grain boundaries at the end of the solidification process.The typical morphology of carbides at grain boundaries revealed by a special etching agent in HSS0 and HSS3 are shown in Fig. 7. It can be seen that the carbides located along solidification grain boundaries have a lamella-like and extensive branching morphology which is the typical shape of the eutectic M2C[2,3] in HSS0 (Fig. 7(a)). However, some fanlike or fishbone-like eutectic colonies consisted of plate- like carbides which are very similar to the shape feature of M6C and few lamellar M2C at the grain boundaries can be observed in HSS3 with 0.12 wt.% RE addition (Fig. 7(b)). Combining the results characterized by variation rule of peaks areas in DSC curves and microstructure shown in Fig. 7, it can be reasonably deduced that RE addition is favorableWANG Mingjia et al.,Influence of rare earth elements on solidification behavior of a high speed steel for roll using (1093)Fig. 7 Typical morphology of carbides at grain boundaries in HSS0 (a) and HSS3 (b)for stable M6C at the expense of the metastable M2C.As mentioned above, the heterogeneous nucleation of the primary Ȗ and MC carbides can be promoted by RE addition; accordingly, the C element concentration is lower in the re-sidual liquid which benefits to the crystallization of the M6C[15]. This could be believed to be an important cause of influence of RE on the formation of the M2C and M6C. Moreover, it is possible that RE may change partition coeffi-cients of some alloy elements such as W and Mo between the residual melts and eutectic carbides so as to facilitate the formation of M6C just like Si in a high carbon HSS[2,15]. However, in order to provide evidence for this mechanism, further research is necessary.3 ConclusionsCurrent research results allow following conclusions to be drawn regarding the effect of RE on solidification behavior of a high speed steel for roll:(1) The sequence of solidification was LĺȖ, LĺȖ+MC, LĺȖ+M2C, LĺȖ+M6C.(2) The start temperature and the heat of reaction liberated by unit mass of LĺȖ and LĺȖ+MC increased with increase of RE addition, which was closely related to promoting ef-fect of RE on the heterogeneous nucleation. That is, the crystallization of the primary Ȗ and MC carbides could be triggered more effectively by RE addition.(3) RE could not only refine the grains but also break the continuous interdendritic network of eutectic carbides. MC carbides were uniformly dispersed in the matrix by RE addi-tion and RES could act as the heterogeneous nucleus of the MC to improve its distribution.(4) RE addition was favorable for stable M6C at the ex-pense of the metastable M2C, which was shown in two evi-dences: (i) with increase of RE addition, the heat of reaction liberated by unit mass of LĺȖ+M6C increased, but that of LĺȖ+ M2C decreased; (ii) the typical morphology of major carbides at grain boundaries varied gradually from lamellar M2C to fanlike or fishbone-like M6C. References:[1] Lin S C, Fu H G. Progresses in research on the high speed steelroll. Wide and Heavy Plate (in Chin.), 2003, 9(1): 3.[2] Hwang K C, Lee S, Lee H C. Effects of elements on micro-structure and fracture properties of cast high speed steel rolls Part I: Microstructural analysis. Materials Science and Engi-neering, 1998, 254A(1-2): 282.[3] Boccalini M, Goldenstein H. Solidification of high speed steels.International Materials Reviews, 2001, 46(2): 92.[4] Luan Y K, Song N N, Bai Y L, Kang X H, Li D Z. Effect ofsolidification rate on the morphology and distribution of eutec-tic carbides in centrifugal casting high-speed steel rolls. Jour-nal of Materials Processing Technology, 2010, 210: 536. [5] Wang M J, Li Y M, Wang Z X, Bao E. Effect of rare earthelements on the thermal cracking resistance of high speed steel rolls. Journal of Rare Earths, 2011, 29(5): 489.[6] Fu H G, Xiao Q, Li Yanxiang. A study of the microstructuresand properties of Fe-V-W-Mo alloy modified by rare earth.Materials Science and Engineering, 2005, 395A: 281.[7] Wang M J, Mu S M, Sun F F, Wang Y. Influence of rare earthelements on microstructure and mechanical properties of cast high-speed steel rolls. Journal of Rare Earths, 2007, 25: 490.[8] Raju S, Jeya Ganesh B, Banerjee Aritra, Mohandas E. Charac-terisation of thermal stability and phase transformation ener-getics in tempered 9Cr-1Mo steel using drop and differential scanning calorimetry. Materials Science and Engineering, 2007, 397A: 29.[9] Ohno M, Mirkovic D, Schmid-Fetzer R. Phase equilibria andsolidification of Mg-rich Mg-Al-Zn alloys. Materials Science and Engineering, 2006, 396A: 328.[10] Yang Q X, Liao B, Cui Z Q, Yao M. Effects of freeing pointon RE inclusion as heterogeneous nucleation of primary aus-tenite in Fe-C alloys. Chinese Journal of Material Research (in Chin.), 1999, 13(4): 353.[11] Yang J, Zou D N, Li X M, Du Z Z. Effect of rare earth on mi-crostructures and properties of high speed steel with high car-bon content. Journal of Iron and Steel Research International,1094 JOURNAL OF RARE EARTHS, Vol. 29, No. 11, Nov. 2011[12] Serna M M, Rossi J L. MC complex carbide in AISI M2high-speed steel. Materials Letters, 2009, 63: 691.[13] Kheirandish Sh, Mirdamadi Sh, Kharrazi YHKK. Effect of ti-tanium on cast structure of high speed steel. Materials Science and Technology, 1998, 14(4): 312.[14] Qu Y H, Xing J D, Zhi X H, Peng J Y, Fu H G. Effect of ce-rium on the as-cast microstructure of a hypereutectic high chromium cast iron. Materials Letters, 2008, 62: 3024. [15] Hashimoto M, Kubo O, Matsubara Y. Analysis of carbides inmulti-component white cast iron for hot rolling mill rolls. ISIJ International, 2004, 44(2): 372.。

化学专业英语马永祥兰州大学--翻译

1. The Elements and The Periodic Table元素和周期表The number of protons in the nucleus of an atom is referred to as the atomic number, or proton number, Z. The numbers of electrons in an electrically neutral atom is also equal to the atomic number, Z. The total mass of an atom is determined very nearly by the total number of protons and neutrons in its nucleus. This total is called the mass of the number, A. The number of neutrons in an atom, the neutron number, is given by the quantity A-Z.refer to sb. [sth.] as 称某人（物）为be determined by 由…确定原子核中质子的数目称为原子序数，或者质子数，以Z表示。

电中性原子中电子的数目也等于原子序数Z。

经测定，原子的总质量与原子核中质子与中子的总数差不多。

（几乎相同）（或者说原子的总质量几乎可以由原子核中质子与中子的总数确定。

）这个总数叫质量数，以A表示。

因此，原子中的质子的数目，质子数，可以定量地由A-Z给出。

即原子中质子数=A-ZThe term element refers to a pure substance with atoms all kinds of a single kind. To the chemist the “kind” of an atom is specified by its atomic number, since this is the property that determines its chemical behavior. At present all the atoms from Z=1 to Z=107 are known; there are 107 chemical elements. Each chemical element has been given a name and a distinctive symbol. For most elements the symbol is simply the abbreviated form of the English name consisting of one or two letters,for example:元素这个术语指的是仅仅由同一种类的原子组成的物质。

钕铁硼油泥稀土和铁同步浸出与分步提取研究

第15卷第1期2024年2月有色金属科学与工程Nonferrous Metals Science and EngineeringVol.15，No.1Feb. 2024钕铁硼油泥稀土和铁同步浸出与分步提取研究林辉阳a ，b ，c ，d ，e ，刘子帅*a ，b ，c ，d ，e ，黎文庆b ，c ，d ，e ，刘海平b ，c ，d ，e，唐学昆a ，b ，c ，d ，e ，周贺鹏a ，b ，c ，d ，e ，罗仙平a ，b ，c ，d ，e（江西理工大学，a.江西省矿冶环境污染与控制重点实验室； b.国家市场监管重点实验室（稀土产品检测与溯源）；c.国家稀土功能材料创新中心；d.离子型稀土资源开发及应用教育部重点实验室；e.稀有金属资源高效开发与利用重点实验室，江西赣州 341000）摘要：钕铁硼废料是一种宝贵的稀土二次资源，对其进行综合高效回收对实现稀土可持续发展与循环利用具有重要的现实意义。

以钕铁硼油泥为研究对象，通过对其进行低温氧化焙烧、盐酸浸出、草酸沉淀稀土、还原沉淀铁进行研究，提出了一种钕铁硼油泥稀土和铁同步浸出与分步提取的新工艺。

结果表明，在较优焙烧温度和浸出条件下，稀土和铁浸出率分别为98.80%和98.41%，实现了同步浸出。

在n （H 2C 2O 4）∶n （RE 3+）=3∶1、沉淀温度60 ℃、沉淀时间30 min 条件下，稀土沉淀率达98.43%，铁共沉淀率仅为0.5%，获得了纯度为98.34%的草酸稀土产品，稀土总回收率为97.24%，实现了稀土和铁的选择性分离。

在n （H 2C 2O 4） ∶ n （Fe ）=1.5∶1、n （Fe ） ∶ n （Fe 3+）=1∶1、沉淀温度30 ℃、沉淀时间30 min 条件下，铁沉淀率为94.28%，获得了纯度为99.22%的草酸亚铁产品，铁总回收率为92.34%，达到了综合回收的目的。

相对传统钕铁硼废料回收工艺，该工艺具有资源综合利用率高、固体废弃物量少等优点，为稀土二次资源综合利用提供了新思路。

HACH 2200 PCX 粒子计数器仪器操作说明书

第1页哈希公司注册商标 57050ttl.fm12200 PCX 粒子计数器仪器操作说明书©哈希公司，2000，所有权保留，美国印刷 dd/dp 1/00 第1版第2页哈希公司注册商标 57050ttl.fm2哈希公司注册商标AccuGrow® AccuVac® AccuVer™ AccuVial™ Add-A-Test™ AgriTrak™ AluVer® AmVer™ APA 6000™ AquaChek™ AquaTrend® BariVer® BODTrak™ BoroTrace™ BoroVer®C. Moore Green™ CA 610™ CalVer®ChromaVer® ColorQuik® CoolTrak® CuVer® CyaniVer® Digesdahl® DithiVer®Dr. F. Fluent™ Dr. H. Tueau™ DR/Check™ EC 310™ FerroMo® FerroVer® FerroZine®FilterTrak™ 660 Formula 2533™ Formula 2589™ Gelex®H2O University™ H2OU™ Hach Logo® Hach One® Hach Oval® ™ HachLink™Hawkeye The Hach Guy™ HexaVer® HgEx™ HydraVer® ICE-PIC™ IncuTrol®Just Add Water™ LeadTrak® M-ColiBlue24® ManVer® MolyVer®Mug-O-Meter® NetSketcher™ NitraVer® NitriVer® NTrak® OASIS™On Site Analysis.Results You Can Trust OptiQuant™ OriFlow™ OxyVer™PathoScreen™ PbEx®PermaChem® PhosVer®Pocket Colorimeter™ Pocket Pal™Pocket Turbidimeter™Pond In Pillow™ PourRite® PrepTab™ ProNetic™Pump Colorimeter™ QuanTab® Rapid Liquid™ RapidSilver™ Ratio™ RoVer® sension™Simply Accurate SINGLET™ SofChek™ SoilSYS™ SP 510™ Spec ™ StablCal® StannaVer® SteriChek™ StillVer® SulfaVer®Surface Scatter® TanniVer® TenSette® Test ‘N Tube™ TestYES! TitraStir® TitraVer® ToxTrak™ UniVer® VIScreen™ Voluette® WasteAway™ ZincoVer®目录哈希公司注册商标 (2)安全预防措施 (4)技术规格 (5)操作 (5)第一节概述 (9)1.1 仪表控制面板 (10)安装 (13)第二节安装 (15)2.1 仪器连接 (17)2.1.1 管件连接 (19)2.1.2 调整流量 (20)2.1.3 电气连接 (22)2.1.4 连接多路传感器 (22)2.2 使用多路模拟信号输入/输出工具 (24)2.3 写入多路接线盒 (28)第三节程序模块配置 (29)3.1 改变操作配置 (29)3.1.1 改变RS485的操作配置 (29)3.1.2 改变RS485的操作配置 (31)3.2 设置对传感器的输入和输出 (31)3.2.1 设置对传感器的输入 (31)3.2.2 设置对传感器的输出 (32)3.2.3 测定刻度值 (33)3.2.4 理解 4-20 mA 的输出信号 (34)3.2.5 SCADA的计算 (35)3.3 4-20 mA 的输出测试 (36)SCADA 工作表 (37)第四节串口协议和命令 (39)4.1 通讯协议 (39)4.2 命令和数据语法结构 (39)第五节维护 (43)5.1 清洁传感器 (43)5.1.1 清洁周期……............................................................................................................................................................ .435.1.2 轻擦清洁……............................................................................................................................................................ .435.1.3 除锈清洁.................................................................................................................................................................. .44 5.2 长期贮存或装运.. (45)5.3 更换传感器流动单元 (46)5.4 更换管材 (46)总说明 (47)合格证书 (48)如何订货 (50)修理服务 (51)有限担保 (52)第3页5705018TOC.fm目录安全预防措施在拆箱、安装或操作本仪器前，请务必阅读该说明书的全部内容。

固相萃取分离富集分光光度法测定水环境中的二价铁

第一作者:李红英,女,1961年生,副教授,主要从事分析化学的研究和教学工作。

3宁夏大学自然科学基金资助项目(No.L0512)。

固相萃取分离富集分光光度法测定水环境中的二价铁3李红英1Minorn O 2(1.宁夏大学化学化工学院,宁夏　银川750021;2.日本岛根大学综合理工学部,日本　松江市6902850) 摘要提出了应用固相萃取分离富集分光光度法测定水环境中痕量Fe 2+的新方法。

水样中的Fe 2+首先与1,102邻二氮菲(1,102phen )络合剂作用生成有色阳离子络合物,然后通过Sep 2Pak C18柱预富集分离,以乙醇和盐酸混合溶液为洗提液,在509nm 测定痕量Fe 2+。

同时,以人工海水为对象详细讨论了盐含量对分析测定的影响。

该方法灵敏度高,选择性好,方法的最低检测限2.9μg/L ,相对标准偏差0.93%,可用于测定淡水和海水水样中痕量Fe 2+,回收率为92%～102%。

关键词固相萃取分光光度法Fe 2+Solid 2phase extraction and color measurement for determination of F e(Ⅱ)in w ater L i Hongy ing 1,M inorn O 2.(1.College of Chemist ry and Chemical Engineering ,N ing x ia Universit y ,Yinchuan N ing x ia 750021;2.De partment of M aterial S cience ,S hinmane Universit y ,M atsue J apan 6902850)Abstract :　Using solid phase extraction for pre 2concentration followed by color measurement ,a new analytical method was developed for determination of trace level Fe (Ⅱ)present in water.Fe (Ⅱ)in a water sample was first converted into a colored cationic complex with phenanthlorine ;the Fe (Ⅱ)2phen complex was absorbed on a Sep 2Pak C18cartridge ,then extracted by 5mL mixture of ethanol and HCl ,and finally quantified by spectrophotometer at 509nm.The method ’s detection limit was 2.9μg/L ;the relative standard deviation for 5.0μg Fe (Ⅱ)was 0.93%.The new analytical method was applicable to f resh water and sea water ;the expected recovery factor was 92%～102%.K eyw ords :　Solid 2phase extractionSpectrophotometerFe (Ⅱ) 铁是天然水体中的微量元素之一,在水中的含量取决于该地区的地质状况及水体中的其他化学成分。

金华“PEP”2024年小学三年级I卷英语第6单元自测题

金华“PEP”2024年小学三年级英语第6单元自测题考试时间：80分钟（总分:100）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、听力题：The symbol for cadmium is _____.2、填空题：The ______ (植物的形状) can affect light absorption.3、听力题：The first successful test of an atomic bomb was in _______.4、What do we call the story of someone's life?A. BiographyB. NovelC. FictionD. Poetry5、听力题：My friend is a ______. He enjoys learning about space.6、听力填空题：School is a place where I learn many things. My favorite subject is __________ because I find it __________. I especially enjoy __________ during our lessons. My teacher,__________, always encourages us to __________. She believes that learning should be fun and exciting.7、填空题：I like to collect different kinds of ________ (玩具类型).8、What do we call the act of exploring new places?A. TravelingB. ExploringC. AdventuringD. All of the above答案: D. All of the above9、填空题：_____ (乡村生活) often revolves around plants and agriculture.10、听力题：His favorite movie is a ________.11、填空题：We built a _____ (沙堡) at the beach.12、What is the largest mammal in the world?a. Elephantb. Blue Whalec. Giraffed. Hippopotamus答案:b13、听力题：My sister is a ______. She loves to create art installations.14、填空题：We need to _______ (改善) our community.15、What is the hardest natural substance on Earth?A. GoldB. DiamondC. IronD. Quartz答案:B16、What do we call the time of year when leaves fall from trees?A. SpringB. SummerC. FallD. Winter答案: C. Fall17、Which continent is known for its deserts?A. AsiaB. AfricaC. EuropeD. Antarctica答案:BOxidation reactions involve the ________ of electrons.19、填空题：I love to ______ (尝试) new hobbies.20、填空题：Orchids are known for their beautiful ______ (花).21、听力题：The process of separating mixtures is called ______.22、What is the name of the famous bridge in San Francisco?A. Brooklyn BridgeB. Golden Gate BridgeC. London BridgeD. Sydney Harbour Bridge23、听力题：The _____ of an element is determined by the number of protons in its nucleus.24、听力题：A precipitate forms when two liquids ______.25、填空题：In _____ (巴西), Carnaval is a major celebration.26、听力题：Chemical changes often involve the formation or breaking of ________.27、填空题：The _____ (果实) of the apple tree is very sweet.28、填空题：A rabbit's diet is primarily made up of ________________ (草和蔬菜).29、听力题：Chlorine is used to disinfect _____ (water) in pools.30、听力题：The kids are _____ in the park. (running)31、听力题：The _____ (leaf) is green.The country famous for its lakes is ________ (加拿大).33、What do you call a baby zebra?A. ColtB. CalfC. KitD. Pup34、选择题：What is the name of the famous character known for his long hat and green jacket?A. The Cat in the HatB. The GrinchC. WaldoD. Peter Pan35、填空题：A stingray glides along the ________________ (海底).36、填空题：I like to play with my ________ (玩具名称) after school.37、填空题：The __________ is the capital city of Canada. (渥太华)38、填空题：The __________ (历史的再现) can evoke powerful emotions.39、听力题：The __________ Ocean is located between Europe and Asia.40、填空题：My grandmother tells me __________. (故事)41、填空题：He _______ (喜欢) playing soccer after school.42、听力题：My cousin is a ______. She enjoys solving problems.43、听力题：The dog is ________ in the park.44、What is the smallest continent?A. AsiaB. AfricaC. AntarcticaD. Australia答案:D45、听力题：The capital of Tuvalu is _______.46、听力题：A chemical that donates electrons is called a ______.47、What do you call the process of water turning into vapor?A. EvaporationB. CondensationC. PrecipitationD. Freezing答案:A48、听力题：A __________ is a geological feature that can shape human activities.49、听力题：The ______ helps with the coordination of movements.50、听力题：The chemical symbol for zinc is __________.51、What is the capital of the United Kingdom?A. LondonB. ParisC. RomeD. Berlin答案:A52、填空题：I enjoy ________ (晨跑) in the park.53、填空题：A ______ (植物资源管理) is vital for sustainability.54、What is the color of a typical chocolate bar?A. BrownB. WhiteC. BlackD. Purple答案:AI call my friend’s sister __________. (妹妹)56、听力题：The _______ of an object can be calculated using its volume.57、听力题：A sound wave can be represented by a ______ wave.58、听力题：My brother is a ______. He enjoys playing video games.59、填空题：The ________ is soft and warm.60、填空题：The museum is very _______ (有教育意义的).61、填空题：The _______ (小乌鸦) caws loudly in the tree.62、听力题：A ____ is often seen in gardens hopping around.63、听力题：The chemical formula for samarium(II) oxide is _____.64、填空题：A __________ day is good for hiking. (晴朗的)65、听力题：The _______ tells us the number of protons in an atom.66、填空题：The filmmaker produces amazing _____ (电影).67、填空题：The sun is shining ________ (明亮).68、What is the name of the famous painting by Leonardo da Vinci?A. The Last SupperB. Mona LisaC. The Starry NightD. The Scream答案:BThe _______ can be very colorful in the spring.70、填空题：The scientist, ______ (科学家), studies animals and plants.71、填空题：I saw a ________ jump over a fence.72、What is the name of the famous mountain in Asia?A. Mount EverestB. Mount KilimanjaroC. Mount FujiD. Mount McKinley答案:A73、填空题：The ancient Romans were known for their ________ and architecture.74、填空题：After the rain, the grass looks __________. (湿润的)75、What do you call a baby pig?A. CalfB. PigletC. LambD. Kid答案:B76、听力题：A polar molecule has regions of _______ charge.77、填空题：My pet rabbit has soft _______ (毛) that I like to pet.78、What is the name of the first female astronaut?A. Sally RideB. Mae JemisonC. Valentina TereshkovaD. Eileen Collins答案:C79、填空题：My puppy enjoys rolling in the ______ (草地).Which sport is played with a bat and ball?A. SoccerB. BasketballC. BaseballD. Swimming81、填空题：A wolverine is a strong ______ (动物).82、What is the name of the fairy tale character who loses her glass slipper?A. Snow WhiteB. CinderellaC. JasmineD. Belle答案: B83、填空题：The ________ was a significant trade route in Asia.84、填空题：The __________ (历史的探索) continues to reveal new truths.85、听力题：The __________ can reveal the history of tectonic plate movements.86、What do we call the study of animals in their natural habitat?A. EthologyB. EcologyC. ZoologyD. Botany答案: B87、听力题：The first person to summit Mount Everest was _______ Hillary.88、What is the main function of leaves on a plant?A. To growB. To photosynthesizeC. To bloomD. To shed答案:B89、听力题：The rabbit is ___ (eating) a carrot.My grandma knitted me a ________ (毛线玩具). It’s a cute little ________ (兔子).91、选择题：What do we call a person who studies astronomy?A. AstronomerB. AstrophysicistC. CosmologistD. All of the above92、填空题：My sister's favorite toy is a _____.93、What is the term for the distance around a circle?A. DiameterB. RadiusC. CircumferenceD. Area答案:C94、听力题：The girl is wearing a ________ dress.95、填空题：A __________ (无机化合物) does not primarily contain carbon.96、填空题：The frog jumps into the ______ (水). It makes a big ______ (水花).97、听力填空题：I enjoy going to the farmer's market to buy __________.98、What do we call the process of plants absorbing sunlight?A. RespirationB. PhotosynthesisC. TranspirationD. Combustion99、What do you call the main character in a comic book?A. HeroB. VillainC. SidekickD. Comic relief答案:AThe bear forages for food in the dense ____.。

黄铁矿微生物浸出体系中的表面热力学和扩展DLVO理论

生物复杂界面作用机理的理论必须含有这些参数。为了弄清微生物在矿物表面的吸附现象 , 国内外进行了广泛的研究。但是研究较多的是矿物与细菌作用后界面的电动性质[ 3 ] , 包括 ζ电位。一般采 ζ 用的电动性质研究方法是使用电位仪测定界面的 ζ电位 , 采用依据微生物生长的 Mo nod 方程直接建立浸矿动力学模型[ 4 ] 。
energy of T hiobaci l l us f erroox i d ans abso rbed o n t he surface of p yrite was a po sitive value , which can not explain t he adhesion behavior of t he bacteria. However , t he adhesion behavior can be exactly p redicted by t he potential en2 ergy grap h of Lif shitz2van der Waals (L W) and Lewis acid2base (AB) and EL interfacial f ree energy as a f unctio n of separation distance ( d) , which were established on t he base of extended DL VO theo ry.
・1464 ・
中国有色金属学报 2006 年 8 月
ΔGtotal ( d) =ΔGL W ( d) +ΔGAB ( d) +ΔGEL ( d) ( 11) 由于矿物颗粒半径远大于细菌半径 ( R ) , 因此将矿物颗粒看成无限厚板 , 而细菌颗粒近似看作球体。根据 EDL VO 理论 , 可以得出矿物颗粒与细菌间接触距离为 d 时相应的相互作用自由能与作用距离的关系 ( 势能曲线 ΔG( d) ) 。 1 ) Lif shitz2van der Waal s ( L W) 相互作用势能曲线

哈奇 Pocket Colorimeter II 简易色谱仪说明书

Pocket Colorimeter™ IISimple as EverJust four buttons on the Hach Pocket Colorimeter II alloweasy operation. The Read/Enter key is used when measuringsample concentrations or to confirm menu choices. TheMenu key provides quick menu navigation and selection.Use the Zero/Scroll key to zero the instrument or to scrollthrough menu options. The Power/Backlight key turns theinstrument on and toggles the display backlight for low lightconditions.Waterproof, Rugged, and Light WeightThe IP67 rating means the Pocket Colorimeter II will resistthe elements and still function properly. A tough, impact-resistant shell protects the electronics and optics. It weighsonly 0.2 kg—about a half pound. A lanyard keeps the capattached to the colorimeter.Large Display and Data LoggingThe Range Indicator icon on the display of the colorimeterindicates either the instrument range or the parameter beingtested. For many parameters, the instrument can measure intwo different ranges. The battery icon will indicate when thebatteries need to be replaced. The instrument logs the tenmost recent data points and the time the measurementswere made—no need to record results manually.Accurate, Reproducible MeasurementsThe Pocket Colorimeter II offers accuracy and reproducibilitycomparable to expensive lab instruments, but is designedfor a long working life in harsh conditions. A long-lastingLED is used as the light source, and low power requirementsassure long battery life.Pre-programmedThe instruments are factory programmed for one or twoof more than 30 parameters. Many are based on EPA-approved methods. No manual calibration is ever required.Simply zero the instrument with a blank, insert the reactedsample, and read the result. Wavelength-specific modelswithout factory calibration are also available forprogramming custom methods.Better OpticsThe higher absorbance range provided by the improvedquality of the optical system over the previous modelprovides expanded ranges for several parameters—reducing the need for dilutions.Features and BenefitsDWWWPWIWEFBColorimeterEach Hach Pocket Colorimeter II measures one to two parameters—many at two concentration ranges. Each instrument comes in aready-to-use kit that includes a manual, pre-measured unit dosereagents, sample cells, and a sturdy custom carrying case.Portable and convenientRugged2LampLight Emitting Diode (LED)DetectorSiliconEnclosureIP67, waterproof at 1 m for 30 minutes (battery compartment excluded) WavelengthFixed wavelength ±2 nm, varies with modelFilter Bandwidth15 nm Absorbance Range0 to 2.5 AbsSample Cell Pathlength1 cm and 1-in. (25 mm)Operating Conditions0 to 50°C (32 to 122°F)0 to 90% relative humidityDisplayLCD, backlitPower Supply4 AAA batteries; approximate life of2000 tests (use of backlight reducesthis number)ComplianceEuropean CE markWarranty2 yearsDimensions6.1 x 15.5 x 3.5 cm (2.5 x 6.2 x 1.4 in.)Weight0.23 kg (0.5 lbs.)*Specifications subject to change without notice.Continued on next page.Parameter Range MethodAlachlor0.1, 0.5 ppb thresholds ImmunoassayAluminum0.02 to 0.80 mg/L Al AluminonAmmonia0.01 to 0.80 mg/L NH3-N SalicylateAmmonia, Free 0.02 to 0.50 mg/L Free Ammonia as NH3-N;Indophenoland Monochloramine0.04 to 4.50 mg/L Monochloramine as CI2Atrazine0.1, 0.5, 3.0 ppb thresholds ImmunoassayBromine0.05 to 4.50; 0.2 to 10.0 mg/L Br2DPDChlorine, Free* and Total* **0.02 to 2.00; 0.1 to 8.0 mg/L Cl2DPDChlorine, Free, Total, and pH†0.1 to 10.0 mg/L Cl2DPD6.0 to 8.5 pH Phenol RedChlorine, Free* and Total* **0.02 to 2.00; 0.1 to 8.0 mg/L Cl2DPDSwifTest DispenserChlorine Dioxide*0.05 to 5.00 mg/L ClO2DPD/GlycineChromium, Hexavalent**0.01 to 0.70 mg/L Cr6+1,5 Diphenylcarbohydrazide Copper** 0.04 to 5.00 mg/L Cu BicinchoninateFluoride* **0.1 to 2.0 mg/L F-‡SPADNS/SPADNS 2Iron, FerroVer®**0.02 to 5.00 mg/L Fe FerroVerIron, TPTZ0.01 to 1.70 mg/L Fe TPTZLead, LeadTrak™ 5 to 150 µg/L Pb Fast Column Extraction Manganese, Low Range0.01 to 0.70 mg/L Mn PANManganese, High Range**0.2-20.0 mg/L Mn Periodate Oxidation Molybdate0.02 to 3.00; 0.1 to 12.0 mg/L Mo Ternary Complex Monochloramine and Free Ammonia0.04 to 4.50 mg/L Monochloramine as CI2;Indophenol0.02 to 0.50 mg/L Free Ammonia as NH3-NNickel and Cobalt0.01 to 1.00 mg/L Ni; 0.02 to 2.00 mg/L Co PANNitrate0.4 to 30.0 mg/L NO3-N Cadmium Reduction Oxygen, Dissolved0.2 to 10.0 mg/L O2HRDOOzone0.01 to 0.25; 0.01 to 0.75 mg/L O3Indigo TrisulfonatePCB in Soil1, 5, 10, 50 ppm thresholds ImmunoassayPhosphate* **0.02 to 3.00 mg/L PO4PhosVer®3Phosphonate0.1 to 2.5; 1 to 125 mg/L PO4PhosVer 3 with UV Digestion3Parameter Range MethodSilica 1 to 100 mg/L SiO2SilicomolybdateSulfate** 2 to 70 mg/L SO4TurbidimetricTPH in Soil20, 50, 100, 200 ppm thresholds ImmunoassayTPH in Water2, 5, 10, 20 ppm thresholds ImmunoassayZinc** 0.02 to 3.00 mg/L Zn Zincon*Method is USEPA accepted or approved for drinking water (additional steps may be required)**Method is USEPA accepted or approved for wastewater (additional steps may be required)†Phenol Red colorimetric pH measurement is not accepted for regulatory reporting.‡Greater sensitivity (0.01 mg/L) is achieved by substituting bottled SPADNS reagent for the AccuVac® Ampuls provided in the kit.2812900Alachlor Pocket Colorimeter II;includes reagents for 18 tests5870025Aluminum Pocket Colorimeter II;includes reagents for 100 tests5870040Ammonia Pocket Colorimeter II;includes reagents for 100 tests5870026Ammonia, Free and Monochloramine PocketColorimeter II; includes reagents for 50 FreeAmmonia tests, 100 Monochloramine tests 2763500Atrazine Pocket Colorimeter II;includes reagents for 18 tests5870001Bromine Pocket Colorimeter II;includes reagents for 50 to 100 tests5870000Chlorine, Free and Total Pocket Colorimeter II;includes reagents for 50 to 100 tests5870012Chlorine, Free, Total, and pH Pocket Colorimeter II;includes reagents for 100 tests5870023Chlorine, Free, SwifTest Dispenser PocketColorimeter II; includes reagents for125 to 250 tests5870024Chlorine, Total SwifTest Dispenser PocketColorimeter II; includes reagents for125 to 250 tests5870051Chlorine Dioxide Pocket Colorimeter II;includes reagents for 100 tests5870017Chromium, Hexavalent Pocket Colorimeter II;includes reagents for 100 tests5870019Copper Pocket Colorimeter II;includes reagents for 100 tests5870005Fluoride Pocket Colorimeter II (SPADNS);includes reagents for up to 50 tests2513100Fluoride Pocket Colorimeter II(SPADNS 2–Arsenic-Free);includes reagents for up to 50 tests5870022Iron, FerroVer Pocket Colorimeter II;includes reagents for 100 tests 5870016Iron, TPTZ Pocket Colorimeter II;includes reagents for 100 tests5870021Lead, LeadTrak Pocket Colorimeter II;includes reagents for 20 tests5870018Manganese, Low Range, Pocket Colorimeter II;includes reagents for 50 tests5870015Manganese, High Range, Pocket Colorimeter II;includes reagents for 100 tests5870010Molybdate Pocket Colorimeter II;includes reagents for 100 tests5870020Nickel and Cobalt Pocket Colorimeter II;includes reagents for 100 tests5870002Nitrate Pocket Colorimeter II;includes reagents for 100 tests5870003Oxygen, Dissolved Pocket Colorimeter II;includes reagents for 25 tests5870004Ozone Pocket Colorimeter II;includes reagents for up to 50 tests2773400PCB in Soil Pocket Colorimeter II;includes reagents for 18 tests5870006Phosphate Pocket Colorimeter II;includes reagents for 100 tests5870007Phosphonate Pocket Colorimeter II;includes reagents for 100 tests5870034Silica Pocket Colorimeter II;includes reagents for 100 tests5870029Sulfate Pocket Colorimeter II;includes reagents for 100 tests2775000TPH in Soil Pocket Colorimeter II;includes reagents for 18 tests2774200TPH in Water Pocket Colorimeter II;includes reagents for 18 tests5870009Zinc Pocket Colorimeter II;includes reagents for 100 testsContinued on next page.The Hach Pocket Colorimeter II includes manual, pre-measured unit dose reagents, sample cells, and a carrying case. Reagents can be refilled by contacting Hach or your Hach distributor.Lit. No. 2596 Rev 2For current price information, technical support, and ordering assistance, contact the Hach office or distributor servingyour area.In the United States, contact:HACH COMPANY World Headquarters P.O. Box 3895870060Pocket Colorimeter II; Light Wavelength 600 nm5870065Pocket Colorimeter II; Light Wavelength 655 nmStandardsSpec✔Ampule Standards are colored gels that simulate the color produced by the analytical procedure, for simple checks on instrument response. Each set includes a blank and three concentrations.2635300Chlorine Spec✔Standard Kit, DPD LR (0 to 2.0 mg/L Cl2); set of 4 vials 2893300Chlorine Spec✔Standard Kit, DPD HR (0 to 6.5 mg/L Cl2); set of 4 vials 2712500Fluoride Spec✔Standard Kit (0 to 2.00 mg/L F-); set of 4 vials2507500Monochloramine/Free Ammonia Spec✔Standard Kit(0 to 4.5 mg/L Cl2and 0 to 0.50 mg/L NH3-N); set of 4 vials2708000Ozone MR Spec✔Standard Kit (0 to 0.75 mg/L); set of 4 vials Accessory5953100Pocket Colorimeter II Soft-Sided Case/Holster(holds colorimeter, two sample cells and reagent pouches)The optional soft-sided case/holster holdsthe Pocket Colorimeter, two vials, and more!。

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

Iron Analysis using the HACH FerroVer method and a Spec 20
Introduction:
HACH ferrover powder pillows can be used as a replacement for the entire set of complexing reagents, etc. that are needed for most iron analysis experiments with the Spec 20. In addition to simplifying the lab, this method also makes the lab safer, saves time, eliminates waste generated from excess solutions, and costs approximately the same as conventional methods.
Each powder pillow contains all the reagents needed for a 5 ml sample or standard to be used in iron analysis. Iron in the sample is immediately complexed to an orange color. More iron in a sample will result in a deeper orange color. From data obtained from a series of iron standards, we will be able to identify the amount of iron in an unknown sample.
Safety: Always wear safety glasses and an apron in the lab.
Procedure:
Part 1 - preparation of standards (steps 1 and 2 may have been done by the instructor)
1. Dissolve 0.7022 grams of ferrous ammonium sulfate, hexahydrate in deionized
water. Dilute to 1.00 L. This solution is 100 mg/L Fe (same as 100 ppm).
2. Form standard solutions of 2, 4, 6, and 8 ppm by diluting 2, 4, 6, and 8 ml of the
100 ppm stock solution to 100 ml in volumetric flasks.
3. Clean and dry a set of cuvettes (or test tubes).
4. Label these B, 2ppm, 4ppm, 6ppm, 8ppm, unkB, and unk.
5. To the first 5 cuvettes pipet exactly 5 ml of the proper solution. B is the blank and will contain distilled water.
6. Add the contents of a HACH ferrover powder pillow (5 ml size) to each of the
first 5 cuvettes, cover with parafilm, and invert several times. You should visually see that the more concentrated solution is a darker orange color.
Part 2 - forming the standard curve
1. Turn on the spec 20, and allow it to warm up for 15 minutes.
2. Adjust the wavelength to 510 nm.
3. With the sample compartment empty, set the instrument to 0%T using the left knob.
4. Wipe off the cuvette containing the blank (using a Kimwipe), and place this cuvette in the sample compartment, being sure to properly align it. Close the cover.
5. Using the right knob, set the instrument to 100%T.
6. What is the absorbance? Record this on the data sheet.
7. The instrument is now ready to take readings. Obtain the 2ppm standard. Wipe
this cuvette, align it, and place it in the sample compartment.
8. Record the absorbance on the data table. If the instrument is analog you can
calculate the absorbance using the formula: A = 2-logT.
9. Repeat steps 7&8 using the remaining of the set of standards (4,6, & 8ppm). Fill
in the data table as you take each reading.
10. Make a graph of Concentration (x-axis) vs. Absorbance (y-axis).
Part 3 - the unknown
1. Prepare the unknown as directed in the procedure you are adapting for this lab, or
obtain it from your instructor.
2. Pipet 5 ml of solution into each of the 2 cuvettes labeled unkB and unk.
3. To the unk cuvette add the contents of a ferrover powder pillow.
4. Insert the unkB cuvette (the blank for this part of the lab) into the Spec 20. Set
100%T using the right front knob.
5. Place the unk cuvette into the Spec 20, record absorbance.
6. From the standard curve, determine the concentration of iron in this 5 ml sample. Data:。