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本文使用金电极为工作电极,银-氯化银电极为参比电极,铂电极为对电极,在硫酸-碘化四乙基铵介质中减小了铋对铜的干扰,提高了铅、镉测定灵敏度.用导数阳极溶出法,可同时测定铜、铅和镉,它们的溶出峰电位分别为+0.25,-0.12和-0.27V、检测下限分别可达:铜(Ⅱ)和铅(Ⅱ)0.2ppb,镉(Ⅱ)0.05ppb.在选定的条件下,溶出峰电流与浓度很好地成线性关系.本文还用三角波循环伏安法观察了电极反应过程.
In this paper, the gold electrode as the working electrode, the silver-silver chloride electrode as the reference electrode and the platinum electrode as the counter electrode, the interference of bismuth on copper was reduced in the sulfuric acid-tetraethylammonium iodide medium, the contents of lead, cadmium (Ⅱ) and Pb (Ⅱ) were determined by the method of derivative anodic stripping, which could simultaneously determine copper, lead and cadmium, their peak elution potentials were + 0.25, -0.12 and -0.27V, respectively. 0.2ppb, cadmium (Ⅱ) 0.05ppb. Under the selected conditions, the peak current eluted and the concentration of a good linear relationship.In this paper, triangular wave cyclic voltammetry was also used to observe the electrode reaction process.