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海水中溶解镉的浓度范围一般在0.01-0.6微克/升之间[1].镉的污染毒性是众所周知的,研究痕量元素镉在海洋食物链中的转移变化过程,对人们研究污染物在海洋的扩散以及海洋环境的自净能力均有积极意义。近年来,国内出现了不少各有特色的用于水质测定的较好的阳极溶出伏安法[2,3],但直接测定海水中痕量镉均有困难。 相似文献
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An analytical method is proposed for the direct determination of Cd in seawater by differential pulse anodic stripping voltammetry and the derivative technique with a hanging mercury drop electrode. The process of determination is quick, simple and convenient. The concentration of Cd in seawater is only determined by adjusting the acidity of seawater to pH 2 and by taking three minutes' plating time. Sensitivity of the method is about 1×10-10M, and accuracy of that satisfactory. Relative standard deviation is about 12% when the concentration of Cd in seawater is approximately 0.04 ppb. A good agreement was obtained by a standard curve and a standard addition technique respectively from determining Cd in the same seawater. Actual measurement time per sample is about 10 min. 相似文献
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