摘要
在ｐＨ４．３０的ＨＡｃ－ＮａＡｃ缓冲液中，Ａｕ（Ⅲ）与５－Ｂｒ－ＰＡＤＡＰ经沸水浴加热形成１：Ｉ紫色配合物，在示波极谱仪上－０．６０Ｖ（ｖｓ，ＳＣＥ）产生一灵敏的配合物吸附波。线性范围５．０×１０￣（－８）～２．００×ｌ０￣（－６）ｍｏｌ／Ｌ检出限２．０×１０８ｍｏｌ／Ｌ．研究３０多种离子的干扰及分离条件。用聚氨酯泡沫塑料分离金用于矿样中金的测定，结果良好。
The polarographic wave of complex of Au(Ⅲ)-5-Br-PADAP in HAc-NaAc buffer solution was studied, The optimum conditions are 5.00×10￣(-8)mol/L 5-Br-PADAP and 0.028mol/L HAC-0.012mol/NaAC at pH4.3.The potential of peak is-0.60V(vs.SCE).The linear rangebetween the peak height and the concentration of Au(Ⅲ)is from 8.0 × IO￣(-8)～2.0 × l0￣(-6)mol/L, and the minimum detectable concentration of Au(Ⅲ) is 2.0 × l0￣(-8)mol/L.The composition of complex is Au(Ⅲ): 5-Br-PADAP=1:1. The conditional stability constant was found to be β=2.53× l0￣7.The character,of polarog-raphic wave and the electrochemical reaction mechanism were investigated by cycle voltammetry and other electrochemical methods.The interference from more than thirty metal ions are tested.The method has been used for determination of trace amount of Au(Ⅲ) in cample. The results are satis-factory.
出处
《贵金属》
CAS
CSCD
北大核心
1994年第2期46-52,共7页
Precious Metals
关键词
金
极谱分析
矿样
Gold,Polarographic analysis
