极谱络合吸附波测定痕量金的研究  

STUDY ON THE DETERMINATION OF TRACES OF GOLD WITH COMPLEX ADSORPTIVE WAVE BY POLAROGRAPHY

作　　者：张利[1] 朱化雨[1] 宋兴良[1] 

机构地区：[1]山东临沂师范学院化学系,临沂276005

出　　处：《理化检验（化学分册）》2005年第10期748-750,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在硫酸-铋-钼酸铵-抗坏血酸-乙醇体系中,金的化合物有一个尖锐、灵敏的络合吸附波,其峰电位为-1.12 V(vs.SCE),一阶导数峰电流与金浓度在0.003～0.15 mg·L-1范围内呈线性关系,检出限为2.0×10-4 mg·L-1,对极谱波的性质进行了研究,用于矿石中金的测定.A new polarographic method for the determination of traces of gold is proposed in this paper. It is found that in a base solution containing H2 SO4, Bi（ Ⅴ ）, ammonium molybdate and alcohol, traces of gold forms a ternary complex with Bi （Ⅴ）, Mo （Ⅵ）, which is adsorbed on the dropping mercury electrode and a sensitive adsorptive wave can be observed at it＇s peak potential of -1.12 V（vs. SCE）. The limit of detection is 2.0×10^-4mg·L^-1. The derivative wave height is directly proportional to gold concentration in the range of 0. 003-0. 15 mg·L^-1. The adsorption characteristic of the wave was experimentally studied. The method has been applied to the determination of traces of Au in ores with satisfactory results.

关 键 词：极谱法 金 金铋钼杂多酸 

分 类 号：O657.1[理学—分析化学]