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利用OP的增溶作用使镉(Ⅱ)与PAN的螯合物溶于水中,从而省略了萃取操作。在水溶液中反应的适宜酸度范围为PH7～11。最大吸收波长和克分子吸光系数虽无变化,但使操作简化,容易掌握,再现性和重演性也有明显提高。用氯仿作溶剂萃取溴化镉络阴离子与DAM所生成的络合物,可达到痕量镉与大量其他共存金属离子的分离。萃取率高,操作简便。本文所提出的方法已应用于水质分析和金属材料的分析,速度和准确度均满意。
The use of OP solubilization of cadmium (Ⅱ) and PAN chelate dissolved in water, thus eliminating the extraction operation. The suitable acidity for the reaction in aqueous solution is in the range of pH 7-11. Although the maximum absorption wavelength and the molecular absorption coefficient have not changed, but the operation is simplified, easy to grasp, reproducibility and repeatability are also significantly improved. Chloroform as solvent extraction of cadmium bromide complex anion and the complex formed by DAM, trace amounts of cadmium can be achieved with a large number of other coexisting metal ions separation. High extraction rate, easy to operate. The proposed method has been applied to the analysis of water quality and the analysis of metal materials with satisfactory speed and accuracy.