Determination of Six Heavy Metal Elements in Rice by Microwave Digestion-Inductively Coupled Plasma Mass Spectrometry

A novel method for the determination of six heavy metals elements(Pb,Cd,As,Tl,Cr and V)in rice by ICP-MS with microwave digestion was established.Analytical conditions were investigated and optimized.115 In,209Bi and 45 Sc were selected as the internal standard elements to effectively overcome the matrix effects and instrument fluctuations.Under the optimized conditions,the detection limits were in the range of 0.067~27.5ng/L with the correlation coefficients over 0.999 for the calibration curve.The method was tested using national plant standard substance and the results are in good agreement with the recommended values.