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Chlorate ion standard solution established by multipath titration techniques
Microchemical Journal ( IF 4.8 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.microc.2018.06.015
Toshiaki Asakai

Abstract Analyses of chlorate ion are essential in evaluating water quality; however, there is no standard solution of chlorate ion characterized by a metrologically valid procedure. This paper describes the measurement procedures and assays of chlorate ions with the linkage to the International System of Units (SI) by multipath gravimetric titration techniques. Three different titration techniques were employed to assay chlorate ions: oxidimetric-reductometric back titration with an iron(II) solution standardized with standard potassium dichromate, precipitation titration with a silver nitrate solution standardized with standard sodium chloride, and oxidimetric-reductometric titration with a thiosulfate solution standardized with standard potassium iodate. The results obtained through three different reactions were in good agreement with each other within their uncertainties. A certified reference material of chlorate ions with the linkage to the SI was first established by evaluating the storage stability of the solution and estimating measurement uncertainties. The assay (mass fraction) of sodium chlorate was characterized by using a weighted mean of the results of three methods; 99.829% ± 0.029% (the value following ± gives a level of confidence of approximately 95%, coverage factor k = 2). Providing with the standard solution through Japan Calibration Service System (JCSS) under Japanese Measurement Act widely allows all analysts to obtain their reliable analytical results.

中文翻译:

多径滴定技术建立的氯酸根离子标准溶液

摘要 氯酸根离子的分析是评价水质的关键;然而,没有以计量有效程序为特征的氯酸根离子标准溶液。本文描述了通过多路径重力滴定技术与国际单位制 (SI) 相关联的氯酸根离子的测量程序和分析。三种不同的滴定技术用于测定氯酸根离子:用标准重铬酸钾标准的铁 (II) 溶液氧化还原滴定法、用标准氯化钠标准硝酸银溶液沉淀滴定和用硫代硫酸盐氧化还原滴定法用标准碘酸钾标准化的溶液。通过三种不同反应获得的结果在它们的不确定度内彼此非常一致。通过评估溶液的储存稳定性和估计测量不确定性,首先建立了与 SI 相连的氯酸根离子标准物质。氯酸钠的测定(质量分数)通过使用三种方法结果的加权平均值来表征;99.829% ± 0.029%(± 后面的值给出了大约 95% 的置信水平,覆盖因子 k = 2)。根据日本计量法,通过日本校准服务系统 (JCSS) 提供标准解决方案,使所有分析人员都能获得可靠的分析结果。通过评估溶液的储存稳定性和估计测量不确定性,首先建立了与 SI 相连的氯酸根离子标准物质。氯酸钠的测定(质量分数)通过使用三种方法结果的加权平均值来表征;99.829% ± 0.029%(± 后面的值给出了大约 95% 的置信水平,覆盖因子 k = 2)。根据日本计量法,通过日本校准服务系统 (JCSS) 提供标准解决方案,使所有分析人员都能获得可靠的分析结果。通过评估溶液的储存稳定性和估计测量不确定性,首先建立了与 SI 相连的氯酸根离子标准物质。氯酸钠的测定(质量分数)通过使用三种方法结果的加权平均值来表征;99.829% ± 0.029%(± 后面的值给出了大约 95% 的置信水平,覆盖因子 k = 2)。根据日本计量法,通过日本校准服务系统(JCSS)提供的标准解决方案,使所有分析人员都能获得可靠的分析结果。029%(± 后面的值给出了大约 95% 的置信水平,覆盖因子 k = 2)。根据日本计量法,通过日本校准服务系统 (JCSS) 提供标准解决方案,使所有分析人员都能获得可靠的分析结果。029%(± 后面的值给出了大约 95% 的置信水平,覆盖因子 k = 2)。根据日本计量法,通过日本校准服务系统 (JCSS) 提供标准解决方案,使所有分析人员都能获得可靠的分析结果。
更新日期:2018-11-01
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