Abstract：The magnesium-based alloy containing single or several light rare earths (lanthanum, cerium, praseodymium and neodymium) and middle rare earths (samarium and gadolinium) was decomposed with hydrochloric acid. In 25 mL of sample solution, the dosage of 0.6 g/L chromogenic reagent was 3-8 mL. The concentration of hydrochloric acid was 0.5-1.0 mol/L. The content of total rare earths in magnesium alloy was determined by tribromoarsenazo spectrophotometry under wavelength of 640 nm. The matrix magnesium had no interference with the determination. When the mass concentration of total rare earths (including light rare earths and middle rare earths) was in range of 0.2-0.8 μg/mL, it showed linear relationship to absorbance. The correlation coefficients (R2) were higher than 0.999. The apparent molar absorptivity (εRE) was (1.10-1.19) × 105 L·mol-1·cm-1. The content of total rare earths in various magnesium alloy samples was determined according to the experimental method. The relative standard deviation (RSD, n=6) was no more than 1.6%. The found results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES).
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