Determination of Cu,Pb,Cr,Ni and Sn in Medium Chain Triglycerides by Microwave Digestion-ICP-MS

In order to meet the national drug safety limits of China,the contents of trace harmful elements of copper,lead,chromium,nickel and tin in medium chain triglycerides(MCT)were determined by inductively coupled plasma mass spectrometry(ICP-MS)with microwave digestion.Under optimal analytical conditions,the linear ranges are 0—30μg/L with the correlative coefficient of 0.999 4—0.999 9.The detection limits of the method are0.013—0.057μg/kg.The relative standard derivations(RSDs)are in the range of 1.2%—6.7%.The average recoveries at three levels of the method are between 94.0% and110.0%.The national standard material GBW10018chicken was analyzed by the method,and the measured element values were in accord with the standard values.