Department of Chemistry, Suzhou University, Suzhou 215006, China.
Talanta. 2003 Oct 17;61(2):165-71. doi: 10.1016/S0039-9140(03)00242-X.
A new high sensitive spectrophotometric determination of trace molybdenum was investigated. The sensitivity of the determination of molybdenum, which based on the color charge transfer complex of molybdotungstophosphate-3,3',5,5'-tetramethylbenzidine, was greatly enhanced by copper(II) ions in the presence of polyvinyl alcohol. The improved method maintained the features of simplicity, rapidity and selectivity, especially eliminating the interference from tungsten. Under the optimum conditions, Beer's law was obeyed over the range from 2 to 32 ng ml(-1) molybdenum with molar absorptivity being 4.92x10(5) l mol(-1) cm(-1) at 660 nm. The relative standard deviation was 1.2% under nine determinations for 16 ng ml(-1) Mo(VI). The present method had been applied to the determination of trace molybdenum in tungsten ores with satisfactory results.
研究了一种新的高灵敏度分光光度法测定痕量钼。基于磷钨钼酸-3,3',5,5'-四甲基联苯胺的电荷转移配合物，在聚乙烯醇存在下，铜（II）离子大大提高了钼的测定灵敏度。改进后的方法保持了简单、快速和选择性的特点，特别是消除了钨的干扰。在最佳条件下，从 2 到 32ngml(-1)范围内，钼的摩尔吸光系数在 660nm 处为 4.92x10(5)lmol(-1)cm(-1)，遵守比尔定律。在 16ngml(-1)Mo(VI)的九次测定中，相对标准偏差为 1.2%。该方法已成功应用于钨矿石中痕量钼的测定。
