亚硝基R盐分光光度法测定硫酸锌溶液中的钴  

DETERMINATION OF COBALT IN ZINC SULFATE SOLUTION WITH NITROSO-R-SALT SPECTROPHOTOMETRY

作　　者：齐妍洁[1] 张旭[1] 沈庆峰[1] 张云彭 许康[1] 焦志良[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《矿冶》2014年第4期97-100,共4页Mining And Metallurgy

摘　　要：改进了传统的亚硝基R盐分光光度法测定硫酸锌溶液中的钴，并详细探讨了该方法中吸收波长、显色剂用量、消解酸种类和用量、加热时间、络合物稳定性、共存离子等测定条件对结果准确度和精密度的影响。实验表明，在pH=5．5—7．0的HAc．NaAe缓冲液介质中，Co2＋与亚硝基R盐反应生成红色络合物，最佳测定波长为530nm。钴的质量浓度0．1～5．0mg／L范围内呈线性关系，相关系数为0．9998。用该方法测定硫酸锌溶液中的钴，其RSD（rt：5）≤5．44％，标准回收率为99％～102％。Traditional nitroso-R-sah spectrophotometry method is improved to determine cobalt content in zinc sulfate solution. The influence of various experimental conditions, including absorption wavelength, dosages of chromogenic agent, kinds and amounts of acids for digestion, heating time, complex stability and coexisting ions, which affect the accuracy and precision are investigated in detail. Experimental results show that, Co2~ reacts with nitroso-R-salt to produce red complexes in acetic acid-sodium acetate buffer medium at pH = 5.5 -7.0 and the best absorption wavelength is 530 nm. The calibration graph is linear in the concentration range of 0. 1 -5.0 mg/L co- balt with a regression coefficient of 0. 9998. This method has been applied to the determination of cobalt in zinc sul- fate solution, the values of RSD（ n =5） is 5.44% or less, and the standard recovery rate is 99% - 102%.

关 键 词：硫酸锌溶液 钴 分光光度法 

分 类 号：O657.3[理学—分析化学]