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用Ｐ２１５－ＴＯＰＯ－ＳＰＡＮ８０－液体石蜡－煤油－内相（ＨＣｌ溶液）乳状液膜体系研究了Ｃｄ（２＋）的迁移行为，只有Ｃｄ~２能与各种阳离子得到满意的分离。最佳液膜体系为４％Ｐ２１５、２％ＴＯＰＯ、５％ ＳＰＡＮ８０、４％液体石蜡、８５％ 煤油和内相（４ｍｏｌ／ＬＨＣｌ）。确定了分离与富集镉（Ⅱ）的最优实验条件，Ｒｏｉ＝１：１（油内比），Ｒｅｗ＝２０：１２０（乳水比）。用此法已成功地测定镀液和工业废水中微量镉，其回收率为９９．４％以上，相对标准偏差在３．７％以下，结果满意。
The migration behavior of Cd (2+) was investigated by P215-TOPO-SPAN80-liquid paraffin-kerosene-internal phase (HCl solution) emulsion membrane system. Only Cd2 could be satisfactorily separated from various cations. The best liquid film system is 4% P215, 2% TOPO, 5% SPAN80, 4% liquid paraffin, 85% kerosene and internal phase (4mol / LHCl). The optimum experimental conditions for the separation and enrichment of cadmium (Ⅱ) were determined. The results showed that Roi = 1: 1 (oil internal ratio), Rew = 20: 120. This method has been successfully measured in the bath and industrial wastewater trace cadmium, the recovery rate of 99.4% or more, the relative standard deviation of 3.7% or less, with satisfactory results.