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微量镉的测定方法,通常有溶出伏安法、原子吸收法、催化极谱法等。为了满足电子工业金属材料中的杂质分析和环境监测的需要,经过实验,我们得出了碘化钾-联吡啶-镉络合物的吸附波。Fe~(3+)的存在使灵敏度进一步提高。较Neves等提出NH_4NO_3-NH_4SCN-联吡啶-镉的吸附波灵敏度高一个数量级以上。方法选择性好,大量镍、铁及20余种常见金属离子及阴离子在一定量时不影响测定。本法可不经任何分离直接测定电真空用镍和废水中微量镉,效果良好。
Determination of trace amounts of cadmium, usually with stripping voltammetry, atomic absorption, catalytic polarography. In order to meet the needs of impurity analysis and environmental monitoring in metal materials of the electronics industry, we have found the adsorption wave of potassium iodide-dipyridyl-cadmium complex through experiments. The presence of Fe ~ (3 +) further increases the sensitivity. Neves and other proposed NH_4NO_3-NH_4SCN-bipyridine-cadmium adsorption wave sensitivity of more than an order of magnitude. The method has good selectivity, a large amount of nickel, iron and more than 20 kinds of common metal ions and anions do not affect the determination in a certain amount. This method can be directly measured without any separation of vacuum nickel and waste water cadmium, the effect is good.