微波消解ICP-MS法同时测定凉茶中的六种重金属元素

Simultaneous Determination of 6 Heavy Meta Elements in Herbal Tea by ICP-MS with Microwave Digestion

摘要:

建立凉茶中As、Pb、Cu、Zn、Fe、Sn等6种重金属的检测方法。微波消解凉茶样品,采用电感耦合等离子体质谱仪(ICP-MS)测定凉茶中的6种重金属元素。优化了微波消解条件和仪器测定条件。所有标准曲线的线性范围在0~100.0 μg/L之间，回归方程的相关系数皆大于0.9999，方法的检出限9 ng/L~55 ng/L，加标回收率在93%~106%之间，精密度RSD小于2.1%。本方法具有快速、准确、可靠、灵敏度高及多元素同时分析等特点，可进行批量凉茶样品测定。

Abstract:

A method for the simultaneous determination of As,Pb,Cu, Zn, Fe and Sn in herbal tea by ICP-MS with microwave digestion was studied. The herbal tea sample was digested in microwave system and the elements were determined by ICP-MS under optimum conditions. The linear range of the calibration curve was 0~100.0 μg/L with a correlation coefficient of 0.9999. The detection limits were in the range of 9~55 ng/L. Recoveries of the elements from the spiked herbal tea sample were of 93%-106%, and the RSD was less than 2.1%. The proposed method was easy to perform.