Quantitative reduction of selenate ion to selenite in aqueous samples
Quantitative reduction of selenate ion to selenite in aqueous samples
复制标题
水样中硒酸根离子定量还原为亚硒酸盐
DOI：
--
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
K. Kulhavy
中科院分区：
文献类型：
--
作者：
S. P. Brimmer;W. Fawcett;K. Kulhavy
生物材料和水中硒的痕量分析主要是测定元素的总量。然而，硒的氧化态形态对于评估该元素的生物利用度及其毒性非常重要。电分析特别适合于这种类型的形态分析，并且具有可以同时测定其他痕量元素的额外优点。本调查的目的是更仔细地评估的条件下，硒酸盐定量转化为亚硒酸盐。亚硒酸盐和硒酸盐测定由美国农业部，弗雷斯诺，加利福尼亚州提供的排水样品。使用阴离子交换树脂（Amberlite伊拉-400）从样品中除去阴离子，并用稀HCl从柱中冲洗，得到0.12 M溶液。电分析程序被证明是有效的，在一个很宽的浓度范围内，在样品中的硒的最低水平为35 ppb。
Trace analysis for selenium in biological materials and water has chiefly been concerned with determination of the total amount of the element. However, speciation of selenium with respect to oxidation state is important in assessing the bioavailability of the element and its toxicity. Electroanalysis is especially well suited to this type of speciation and has the additional advantage that other trace elements can be determined simultaneously. The purpose of the present investigation was to assess more carefully the conditions under which selenate is quantitatively converted to selenite. Selenite and selenate were determined in drainage water samples supplied by the US Department of Agriculture, Fresno, CA. The anions were removed from the sample using an anion exchange resin (Amberlite IRA-400), and flushed from the column with dilute HCl to give a 0.12 M solution. The electroanalytical procedure was shown to be effective over a wide concentration range, the lowest level of selenium in the samples tested being 35 ppb.