离子交换与吸附

对多氨羧基螯合树脂SL-401的性能进行了系统研究,该树脂的特点之一是吸附钴与镍有明显差别,能从大量钴中选择性地分离微量镍和铜。已成功地用于测定化学纯或分析纯钴盐中微量镍和铜。

This paper reports the properties of polyiminodiacetate chelating resin SL-401. The adsorption of Ni²⁺ and Co²⁺ at pH 1on the resin is quite different. The optimum pH value chosen for separation of Ni²⁺ from Co²⁺ is pH 1.5. A column containing 3ml of resin(H⁺form) is suitable for separation of microgram magnitude of Ni²⁺ and Cu²⁺ in Co²⁺ salt solution (1g CoCl₂·6H₂O) adjusted to pH1.5, at a flow rate of 2.5 min.ml^-1. The resin selectively adsorbs Ni²⁺ and Cu²⁺, which can be eluated out with 2.4mol.L^-1 HC1. The method is applicable for the analysis cf minute Ni²⁺ and Cu²⁺ in cobaltous salts solution.