邻苯二甲酸氢钾阴极吸附溶出伏安法测定铀

Cathodic adsorptive stripping voltammetric determination of uranium with potassium hydrogen phthalate.

作者信息

Farghaly O A, Ghandour M A

机构信息

Chemistry Department, Faculty of Science (Qena), South Valley University, Qena, Egypt.

出版信息

Talanta. 1999 Jun;49(1):31-40. doi: 10.1016/s0039-9140(98)00338-5.

DOI:10.1016/s0039-9140(98)00338-5

PMID:18967571

Abstract

The adsorption properties of dioxouranium (II)-Phathalate complexes onto hanging mercury drop electrode are exploited in developing a highly sensitive and selective stripping voltammetric procedure for the determination of uranium (VI). The reduction current of adsorbed complex ions of U(VI) was measured by both linear sweep (LSCSV) and differential pulse cathodic stripping voltammetry (DPCSV), preceded by a period of preconcentration onto the electrode surface. As low as 2x10(-9) mol dm(-3) (0.5 mug/l) and 2x10(-8) mol dm(-3) (4.8 mug/l) with accumulation time 240 and 120 s using DPCSV and LSCSV, respectively, have been determined successfully. The relative standard deviation of 2.2% at the 5 ppm level was obtained. The interferences of some metal ions and anions were studied. The application of this method was tested in the determination of uranium in superphosphate fertilizer.

摘要

利用二氧铀（II）-邻苯二甲酸酯配合物在悬汞滴电极上的吸附特性，开发了一种用于测定铀（VI）的高灵敏度和选择性溶出伏安法。在电极表面进行一段时间的预富集后，通过线性扫描（LSCSV）和差分脉冲阴极溶出伏安法（DPCSV）测量吸附的U（VI）络合离子的还原电流。使用DPCSV和LSCSV时，分别在240秒和120秒的积累时间下，成功测定了低至2×10⁻⁹摩尔/立方分米（0.5微克/升）和2×10⁻⁸摩尔/立方分米（4.8微克/升）的铀。在5 ppm水平下获得了2.2%的相对标准偏差。研究了一些金属离子和阴离子的干扰。该方法在过磷酸钙肥料中铀的测定中进行了应用测试。