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本文报道了一种测定痕量镉离子的灵敏的电分析方法。在pH8.34 NH_3-NH_4Cl介质中,CNAQS-Cd~(2+)络合物在-0.72V有一灵敏的吸附还原峰,峰电流与镉浓度在一定范围内成线性关系,最低检测限为0.20ng/ml。确定Cd~(2+)-CNAQS的络合比为1:1,并对其电化学机理进行了初步的探讨,拟定了测定痕量镉的方法,应用于高炉煤气洗涤污水中镉分析,结果与原子吸收法一致。
This paper reports a sensitive method for the determination of trace cadmium ions. In pH8.34 NH3-NH4Cl medium, the CNAQS-Cd2 + complex has a sensitive adsorption reduction peak at -0.72V, and the peak current and the concentration of cadmium have a linear relationship within a certain range with the minimum detection limit of 0.20 ng / ml. The complex ratio of Cd ~ (2 +) - CNAQS was determined to be 1: 1. The electrochemical mechanism of Cd ~ (2 +) - CNAQS was preliminarily discussed, and the method for determination of trace cadmium was developed. The method was applied to the analysis of cadmium in blast furnace gas washing wastewater. Consistent with atomic absorption method.