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A novel conductometric titration approach for rapid determination of boron
Indian Journal of Chemistry, Section A ( IF 0.412 ) Pub Date : 2020-01-22
R Ananthanarayanan, M P Rajiniganth, M Sivaramakrishna, B S Panigrahi, B K Panigrahi

In laboratories dealing with radioactive samples it is important to minimize both the sample size and also the associated waste generated in an analysis. To meet this objective a rapid conductometric titration technique is developed to determine boron in the moderators of Pressurized Heavy Water Reactors (PHWR’s). Using this novel PC interfaced titration facility a minimum tenfold reduction in sample size is achieved compared to conventional conductometric titration. Determination of boron is based on the conversion of extremely weak boric acid to better conducting boron mannitol complex and titrating the complex against NaOH. Various parameters affecting the analysis, when moving from large to small sample size, are analyzed and optimized. The technique is primarily proposed for the assay of boron (≥0.5 ppm) during reactor startup. Each analysis requires less than 10 min. The detection limit is 0.5 ppm and the precision obtained at this level is 4.6% RSD. The technique is a good alternative to less sensitive carminic acid based spectrophotometric method.

中文翻译:

一种快速测定硼的新型电导滴定方法

在处理放射性样品的实验室中,重要的是最小化样品量以及分析中产生的相关废物。为了达到这个目的,开发了一种快速电导滴定技术来测定加压重水反应堆(PHWR)的缓和剂中的硼。与传统的电导滴定法相比,使用这种新颖的PC接口滴定工具可将样品尺寸减少至少十倍。硼的测定是基于极弱的硼酸转化为导电性更好的硼甘露糖醇配合物并针对NaOH进行滴定。从大样本量变为小样本量时,影响分析的各种参数都经过分析和优化。该技术主要用于反应器启动过程中的硼(≥0.5ppm)分析。每次分析少于10分钟。检出限为0.5 ppm,在此水平下获得的精密度为4.6%RSD。该技术是基于敏感性较低的氨基甲酸的分光光度法的良好替代方法。
更新日期:2020-01-22
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