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Cation determination is important for quality control of beverage products. To determine a large group simultaneously, a capillary electrophoresis procedure is developed with indirect UV at 214 nm in a three-complex buffer system (10mM N,N-dimethylbenzylamine (DBA), 8mM lactic acid and 2mM 18-crown-6) with good mobility matching with desired cations. Under optimized conditions with pH adjusted to 4.65, a baseline separation is achieved for 14 cations (Rb+, NH4 +, K+, Ca2+, Na+, Mg2+, Mn2+, Co2+, Fe2+, Cd2+, Cr3+, Ni2+, Zn2+ and Cu2+) within 7 min using an uncoated silica column. To cover ng/l to g/l range, both hydrostatic and electrokinetic sampling are studied, showing working ranges within (0.0550)/(0.0052) g/l and detection limits (1378)/(1.410) ng/l, respectively with satisfactory repeatability (RSD 0.310.47% for migration time, and 3.04.0% for peak height measurement). Agreeable results with established inductively coupled plasma-atomic emission spectrometry method have been obtained for orange juice and tea samples.
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Create Date : 17 กรกฎาคม 2553 |
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Last Update : 17 กรกฎาคม 2553 14:44:17 น. |
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