Determination of harmful trace elements in fruit juice with microwave digestion by ICP-MS
To establish the method for determination of Cr, Ni, As, Cd and Pb harmful trace elements in fruit juice by inductively coupled plasma quadru-pole mass spectrometry (ICP-QMS). The sample was dissolved by microwave digestion in HNO 3 +H 2 O 2 , the solution was analyzed by ICP-MS. It was found that the spectral interferences could be calibrated by settings of the operational parameters of ICP- MS, selecting different isotope and correction equation of interference elements. The matrix effects and the instrument drift could be eliminated by selecting Sc, Rh and Bi as the internal standard elements. The optimum conditions for the determination is tested and discussed. The detection limits range from 0.012 μg/L to 0.083 μg/L depending on the elements. Recoveries of samples were of the range 92.38%~103.68% and precision was fine RSD1.79%. This method is accurate, quick-acquired and convenient. It is used in the determination of harmful trace elements in fruit juice.