Abstract: Capillary ion analysis(CIA) was used to determine the contents of Zn, Mn, Cu, Pb and Cd in tea. In the solution(pH=4.0) containing 10βmmol/L of imidazol and 10βmmol/L of α-hydroxyacetic acid, Zn, Mn, Cu, Pb and Cd in tea were separated within 10βmin. Zn, Mn, Cu, Pb and Cd in tea were detected at 214βnm by indirect UV, and quantified externally. The calibration curves of five elements showed good linearity .The correlation coefficient were 0.9973~0.9997.The average recoveries were 96.4%~104.2% with RSD of 2.1%~3.3%.The detection limits were 0.02~0.2βµg/ml. The result showed that the method is convenient, rapid, accurate and lower cost. It was used in the determination of tea samples, and satisfactory results could be obtained.

Key words: Capillary ion analysis, Indirect UV detection, Tea, Zn, Mn, Cu, Pb, Cd