Cd and Zn were separated from Co, from chloride solutions containing 16 different metal ions. The separation method used was liquid–liquid extraction. Two different chloride concentrations, 0.5 and 5 mol/kg, were tested. Aliquat 336 in toluene was used as extractant. It is shown that Li 2 SO 4 can back-extract the metals. Distribution ratios were determined using radiotracers or inductively coupled plasma mass spectrometry. The results of these methods are compared. In particular, we demonstrate that the determination of low distribution ratios are limited by the uncertainty of the measured concentration of the feed solution.

中文翻译：

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使用 Aliquat 336 从多元素基质中萃取、分离和反萃取 Cd、Zn 和 Co 的单相和两相测量比较

从含有 16 种不同金属离子的氯化物溶液中分离出 Cd 和 Zn。使用的分离方法是液-液萃取。测试了两种不同的氯化物浓度，0.5 和 5 mol/kg。甲苯中的 Aliquat 336 用作萃取剂。结果表明，Li 2 SO 4 可以反萃取金属。使用放射性示踪剂或电感耦合等离子体质谱法确定分布比。比较这些方法的结果。特别是，我们证明了低分配比的确定受到进料溶液测量浓度的不确定性的限制。