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Journal of the Chilean Chemical Society

versión On-line ISSN 0717-9707

Resumen

GAO, JINZHANG et al. SEPARATION AND DETERMINATION OF SIX METAL CATIONS BY CAPILLARY ZONE ELECTROPHORESIS. J. Chil. Chem. Soc. [online]. 2008, vol.53, n.1, pp. 1420-1423. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072008000100020.

A rapid, simple and reliable method was devised for separation and determination of six metal cations, based on the capillary zone electrophoresis. The results showed that the complete separation of K+,Cu2+, Zn2+, Mn2+, Pb2+and Cd2+canbe achieved within 5 min. Anew electrolyte system containing 15 mmol-L"1 imidazole as a background absorbance reference and 8 mmol-L"1 malonic acid, 2 mmol-L-1 18-crown-6 ether as the complexing agents, 10%methanol as anorganic modifier, by using acetic acid to adjust the pH=4.40 was developed. The applied voltage was 20 kV at 25 °C. Under the optimum conditions, 6 ions were separated and determined with the correlation coefficient of 0.9984-0.9993. The detection limits (S/N=3) from 0.05 (K+)to 0.75 (Zn^mg-L1. The repeatability of migration times was less than 0.60% and of peak area ranged from 3.4 to 5.6% (n=6). The results were compared with AAS for analyzing the real samples of waste-water and snow water

Palabras clave : Electrolyte composition; metal cations; capillary zone electrophoresis.

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