P204萃取色谱法对Co~(2+)的分离研究

对萃取色谱法分离钴与铜、镉、锰、锌、铁等金属离子进行了研究。用含Ｐ２０４萃取剂的萃淋树脂，经过ｐＨ４．０的ＮａＡｃ溶液转型后，只需用ｐＨ２．５的氯乙酸－氯乙酸钠缓冲溶液作为流动相淋洗，就可将钴与其它金属离子分离。方法分离效果好，操作简单方便，是分离分析钴的一种新方法。

Study on the Separation of Co 2 from Cu 2 , Cd 2 , Mn 2 , Zn 2 and Fe 3 by Extraction Chromatography

In this paper, extraction chromatography by which Co2+ can be separated from Cu2+, Cd2+, Mn2+, Zn2+, Fe3+ is developed. The chromatographic column was 17 mm i.d. x 520 mm, containing polymers synthesized by styrene, divinylbenzene and P204 (volume fraction was 40%), with particle size of 100-200 mesh. The effects of transformation of P204 from the H(+)-form to the Na(+)-form by NaAc solution, the eluent acidity, and eluent composition were investigated. The results indicated that this extraction chromatographic method is good to separate Co2+ from Cu2+, Cd2+, Mn2+, Zn2+ and Fe3+, and the condition of separation is simple and convenient. When the P204 is transformed from the H(+)-form to the Na(+)-form by pH 4.0 NaAc (0.5 mol/L), and the column is eluted with pH 2.5 ClCHCOOH-ClCHCOONa (0.1 mol/L), the separation can be completed effectively.