Abstract：The analysis method of nickel and magnesium contents in nickel-magnesium alloy by EDTA complexometric titration was established. The sample was dissolved with nitric acid and hydrochloric acid. A certain volume of solution was sampled to precipitate nickel with dimethylglyoxime by adding citric acid to mask the iron ions. Then, the precipitating agent was destroyed by nitric acid and perchloric acid. The content of nickel was titrated with EDTA standard solution using murexide as indicator. Meanwhile, a certain volume of solution was sampled to pre-separate nickel matrix with cuprisone. The residual interference ions were masked by adding hydroxylamine hydrochloride, potassium cyanide and triethanolamine. The content of magnesium was determined with EDTA standard solution using chrome black T as indicator. The precipitating agent was discussed. The results showed that the addition of dimethylglyoxime for complex-precipitation of nickel exhibited good selectivity. During the determination of magnesium, the cuprisone was selected to precipitate nickel matrix and other interference ions. The content of magnesium ions in filtrate could be directly determined with little interference. The content of nickel and magnesium in nickel-magnesium alloy sample was determined for several times. The relative standard deviation (RSD, n=6) was 0.23%-0.57% and 0.76%-0.90%, respectively. The main components and content in nickel-magnesium alloy was simulated to synthesize sample solution for determination. The found results were consistent with the theoretical values. The proposed method was applied to the analysis of actual nickel-magnesium alloy sample, and the determination results were consistent with the reference method.
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