Separation and determination of inorganic cations in beverages by capillary electrophoresis with indirect UV detection |
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Authors: | Jinzhang Gao Haifeng Fan Wu Yang Xiangli Sun Chongyang Li Xuefeng Mao Jie Wang Rong Wang Zhengping Jia |
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Affiliation: | (1) College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China;(2) Lanzhou General Hospital for PLA, Lanzhou, 730070, China |
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Abstract: | A rapid, simple and reliable capillary electrophoresis method for the separation and quantitation of inorganic cations with indirect UV detection at 214 nm was developed. The electrolyte was: 12 mM imidazole as background absorbance provider; 5 mM malic acid and 1.0 mM 18-crown-6 ether as complexing agents; and 20% D2O (v/v) to improve ion mobility. The pH was 4.25. The applied voltage was 22 kV at 22°C. Nine ions were completely separated and determined with correlation coefficients of 0.9979-0.9992. The relative standard deviations (RSD) were less than 0.5% for migration time and less than 5.2% for peak area (n=8). The detection limits (S/N=3) were from 0.08 mg L−1 (for Na+) to 0.51 mg L−1 (for Cu2+). To assess the reliability atomic absorption (AA) was also used to determine the same samples. Satisfactory results were obtained for real samples of jasmine tea drink and coconut milk. |
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Keywords: | Capillary electrophoresis Inorganic cations Beverages Malic acid D2O |
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