对测定草酸钴中钴含量的容量法进行了改进。采用盐酸直接溶解样品,并以红紫酸铵作指示剂,以冰醋酸及氨水作溶液pH值调整剂,对钴含量进行EDTA滴定分析,简化了操作,分析结果的相对标准偏差为0.026%。%A standard volumetry for determination of cobalt in cobaltous oxalate was studied and improved. The hydrochloric acid was used to dissolve the sample directly, the murexide as indicator, and the glacial acetic acid and aqueous ammonia (10% NH3*H2O) were used as pH adjusting agent of the solution. The 0.01 mol/L EDTA standard solution was added until the color of the solution turn purplish red from bright yellow. This improved method effectively simplified the operations and the relative standard deviation (RSD) is less than 0.03%.
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