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分别采用离子交换树脂分离法和无机沉淀剂分离法对Fe3+、Co2+、Ni2+混合体系进行离子分离，然后利用滴定分析法或重量分析法对分离出的离子的含量进行分别测定．根据离子含量测定结果的相对误差及测定结果的相对标准偏差，得出相应的结论，选出适合的实验方法．
The separation of Fe3 +, Co2 + and Ni2 + was carried out by ion exchange resin separation method and inorganic precipitant separation method, respectively. Then the contents of isolated ions were determined by titration analysis or gravimetric analysis. According to the relative error of determination result of ion content and the relative standard deviation of determination result, the corresponding conclusion is drawn and the suitable experimental method is selected.