水中微量砷的示波极谱测定

• 作 者: 陈立华
• 出 处: 吉首大学学报(自然科学版)
• 发表日期: 1987年02期
• 关键词: 示波极谱 吸附波 测定下限 峰电流 钼酸铵溶液 乙醇体系 分光光度法 底液 混合溶剂 丁酮

微量砷的测定多采用分光光度法.应用极谱催化波测定砷已有报道.文献首次提出砷的杂多酸吸附波.本文在此基础上,对体系中的各种试剂的用量等条件进行了实验,选择了HCI—Sb(Ⅲ)—钼酸铵—丙酮—丁酮—乙醇体系.在此体系中,砷与锑(Ⅲ)、钼(Ⅵ)形成三元杂多酸阴离子在-0.37V(对SCE)有一个非常尖锐的吸附波.其测定下限达2×10~(-7)mol/1.实际应用表明,本法具有波形好、灵敏、准确和快速等特点.

Determination of trace arsenic and more use of spectrophotometry.Application of polarographic catalytic wave arsenic has been reported.For the first time the literature proposed arsenic heteropolyacid adsorption wave.In this paper on this basis, the system of reagents such as the amount of conditions In this experiment, we choose HCI-Sb (Ⅲ) -Ammonium molybdate-acetone-butanone-ethanol system.In this system, the anions of ternary heteropolyacid formed by arsenic, antimony V (for SCE) has a very sharp adsorption wave with a lower limit of determination of 2 × 10 -7 mol / L. The practical application shows that this method has the characteristics of good waveform, sensitivity, accuracy and fastness.