硼氢化钾分析方法改进

Improvement on analytical method for potassium borohydride

采用原化工行业标准(HG/T 3584—1999《硼氢化钾》)测定硼氢化钾主含量时存在以下弊端:1)碘化钾试剂加入量过多(5 g),浪费试剂;2)硼氢化钾称样量为0.2 g,精确到0.000 2 g,但当称样量较大时,测定的硼氢化钾含量会降低。针对以上问题,对原硼氢化钾测定方法(HG/T 3584—1999《硼氢化钾》)进行了改进:1)将碘化钾加入量由5 g减少到2.5 g,节省了碘化钾试剂用量;2)根据硼氢化钾的还原特性,将硼氢化钾的称样量限制在特定范围。实验结果令人满意。

There are disadvantages for the use of the orignial chemical industry standard(HG/T 3584—1999 Potassium Borohydride) to determine the content of potassium borohydride,such as:1)The addition of potassium iodide reagent(5 g) is too much resulting in wasting;2)The sampling weight of potassium borohydride is 0.2 g,accurately up to 0.000 2 g,but the determined content of potassium borohydride will be decreased when the sampling weight is larger.In allusion to above problems,the original potassium borohydride determination method(HG/T 3584—1999 Potassium Borohydride)was improved: 1)The potassium iodide addition is reduced to 2.5 g from 5 g so as to save the reagent consumption;2)According to the potassium borohydride′s deoxidization characteristics,the sampling weight is limited within a specific range.Experiment results were satisfied.