Selection of hyposensitive line in flame atomic absorption spectrometry and its application in the determination of magnesium in industrial zinc sulfate solution
WU Hai-yan, ZHANG Xu*, SHEN Qing-feng, HE Huan, ZHANG Yun-peng
Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract：A determination method of high content magnesium in industrial zinc sulfate solution by flame atomic absorption spectrometry (FAAS) was established. The hyposensitive line of Mg 202.6 nm was used as analytical line, 2% hydrochloric acid was used as determination medium, and 5 mL of 50 mg/mL lanthanum nitrate solution was used as releasing agent.The results showed that the linear relationship was good when the mass concentration of magnesium was in range of 1.0-30.0 μg/mL. The calibration curve was A=0.028 ρ (μg/mL)+0.004 3 with correlation coefficient of R2=0.999 8. The detection limit of method was 0.15 μg/mL. The experiments indicated that other elements in industrial zinc sulfate solution did not interfere with the determination of magnesium when the dilution ratio of sample solution was higher than 320. The proposed method was applied to the determination of magnesium in actual industrial zinc sulfate solution. The average value was 5.67 mg/mL, and the relative standard deviation (RSD, n=5) was 1.7%. The industrial zinc sulfate solution was determined by the experimental method and EDTA titration method, and the found results were basically consistent. The recoveries of standard addition were between 96% and 104%.
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WU Hai-yan, ZHANG Xu, SHEN Qing-feng, HE Huan, ZHANG Yun-peng. Selection of hyposensitive line in flame atomic absorption spectrometry and its application in the determination of magnesium in industrial zinc sulfate solution. , 2016, 36(1): 36-39.
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