Determination of copper, lead, arsenic and cadmium in fructus amomi by microwave digestion-inductively coupled plasma mass spectrometry
WANG Kui, ZHANG Ni, WEI Zeng, MA Yifei
Xi'an Northwest Geological Research Institute for Nonferrous Metals Ltd., Co., Xi'an 710054, China
Abstract：A method for determination of trace copper, lead, arsenic and cadmium in fructus amomi cultivated in high arsenic soil in Southwest Guizhou Province was established by microwave digestion combined with ICP-MS. The conditions of microwave digestion were optimized. In order to avoid the interference of the reagent on mass spectrometry, nitric acid-hydrogen peroxide mixed solution (the volume ratio was 3∶1) was selected as the microwave digestion reagent.The solution was detected with ICP-MS. The correction equation was used to corrected for mass interference of arsenic and cadmium. The linear correlation coefficients of the four elements of Cu, Pb, As, Cd were all more than 0.999 2, and the detection limits were 0.073, 0.048, 0.39, 0.062 μg/L, respectively. The relative standard deviations of determination results were all less than 4.5%（n=5）. The recoveries of each element were 96%-105%. The method of sample processing is fast, simple with high dissolution rate. The method is accurate and reliable, it is suitable for determination of Cu, Pb, As and Cd in fructus amomi batch sample.
Keywords：microwave digestion; ICP-MS; fructus amomi; copper; lead; arsenic; cadmium
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