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近年来对镉的吸附波,已有较多的研究测定下限通常可达0.01～0.02μgml~(-1)。文献研究了在溴化钾-乳酸-十六烷基三甲溴化铵体系中镉的极谱行为,并用于纯锌中0.001%镉的测定。但引入表面活性剂(CTMAB)在室温低于8℃时,会析出结晶,妨碍测定。赵振明提出在酸性介质中,以苦杏仁酸-四乙基碘化铵为镉的催化波体系,灵敏度有所提高,并用于水样中镉的测定。据此,我们研究了苦杏仁酸-碘化钾体系镉的极谱行为,其峰位在-0.72V。方法有良好的选择性和稳定性,可用于高纯锌中10~(-4)%镉的直接测定。加标回收率为98～104%。
In recent years, the adsorption wave of cadmium has been more research and determination of the lower limit is usually up to 0.01 ~ 0.02μgml ~ (-1). The literature investigated the polarographic behavior of cadmium in potassium bromide-lactic acid-hexadecyltrimethylammonium bromide system and was used for the determination of 0.001% cadmium in pure zinc. However, the introduction of surfactant (CTMAB) at room temperature below 8 ℃, will precipitate crystallization, impede the determination. Zhao Zhenming proposed in acid medium, with mandelic acid - tetraethylammonium iodide as cadmium catalytic wave system, the sensitivity has increased, and for the determination of cadmium in water samples. Based on this, we investigated the polarographic behavior of the mandelate-potassium iodide system with a peak at -0.72V. The method has good selectivity and stability and can be used for direct determination of 10 ~ (-4)% cadmium in high purity zinc. Spike recovery was 98 ~ 104%.