Abstract：Copper-magnesium master alloy is a kind of representative high-strength and high-conductivity alloy in copper alloy materials. It has been widely used in many fields such as electrommunication and transportation. Magnesium is usually added in smelting in the form of master alloy. However, there are few methods for the accurate determination of high-content magnesium in copper-magnesium master alloy. In experiments, the copper-magnesium master alloy sample was dissolved with hydrochloric acid-nitric acid mixture. Hexamethylenetetramine solution and copper reagent were used as precipitator to separate matrix elements and impurity elements via two-step precipitation. The residual trace metal ions were masked with L-cysteine, triethanolamine and hydroxylamine hydrochloride solution. Then the pH of solution was adjusted to about 10 using ammonia water-ammonium chloride buffer solution. The content of magnesium in copper-magnesium master alloy was determined by EDTA titration using chrome black T as the indicator. The addition amount of precipitator and masking reagent were obtained through conditional experiments. The content of magnesium in copper-magnesium master alloy sample was determined according to the experimental method. The relative standard deviations (RSD, n=11) of determination results were between 0.27% and 0.48%. The recoveries were between 99.6% and 100.9%. The proposed method could meet the detection requirements of copper-magnesium master alloy with mass fraction of magnesium in range of 10%-30%.
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