Nitroso-R光度法检测湿法炼锌净化渣中的Co(Ⅱ)

Determination of Co(Ⅱ) in the Purifying Residue of Zinc Hydrometallurgy by Spectrophotometry with Nitroso- R Salt

湿法炼锌净化渣中的钻是重要的二次资源，测定钻含量是钻合理回收的基本条件。在pH=7．5时，亚硝基R盐与co（II）形成络合物并被氧化形成Co（Ⅲ）的稳定络合物，并以浓硫酸破坏样品中干扰离子的络合物，消除干扰。在波长入=522nm检测，检测限为0．0274μg/mL（n=6），在0—5．0μg/mL范围内符合比尔定律。方法用于检测样品中的钴含量为2．80％，ICP检测结果为2．89％，结果满意。

Cobalt in the purifying Rresidue of Zinc Hydrometallurgy was the important secondary resources, and the determination of Co（II） was one of the basic conditions for the recovery of metal cobalt. At pH = 7.5 buffer solution, the analyte forms the stable complex with nitroso - R salt when it became oxidized. The detection wavelength of absorption of complex was 522 nm. The detection limit was 0. 027 4 μg/mL （n = 6 ）. Analytical graphs were rectilinear in the concentration range of 0 - 5.0 μg/mL. The content of Co（II） in the purifying residue of Zinc hydrometallurgy by UV and ICP was 2. 80% and 2. 89%, respectively. The method determine the purifying residue of Zinc hydrometallurgy. was simple and efficient with good selectivity when it was used to