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用硫氰酸盐作显色剂用光度法测定焦磷酸盐电镀锡钴溶液中的钴含量，方法简便易行，分析结果的准确度和精密度能满足生产要求。１ 试剂和仪器钴标准溶液：称取４．７６９９ｇ硫酸钴（ＣｏＳＯ４·７Ｈ２Ｏ）溶于水中，加入硫酸（１＋１）溶液４ｍｌ，移入１０００ｍｌ容量瓶，?
Using thiocyanate as a chromogenic reagent to determine cobalt content in the tin-tin-cobalt solution of pyrophosphate by a photometric method is simple and convenient, and the accuracy and precision of the analytical results can meet the production requirements. 1 Reagents and Instruments Cobalt standard solution: Weigh 4.7699g cobalt sulfate (CoSO4 · 7H2O) dissolved in water, add 4ml of sulfuric acid (1 + 1) solution into 1000ml volumetric flask ,?