Application of Three Digestion Methods to Determination of Four Heavy Metals in Sediment by ICP-MS

Three digestion methods were investigated to compare the effects on determination of four elements in certified reference material.The results showed that the efficiency of microwave digestion was better than the other two digestion methods,but the royal water method for determination of Cd was better than the other two digestion methods.A method based on inductively coupled plasma-mass spectrometric(ICP-MS) analysis was established for the determination of four heavy metals(Cr,Cd,Hg,Pb) in sediments.Good linearity of the calibration curves were obtained for these elements(r=0.9999-1.0000).Detection limits for these twelve elements were in the range of 2.4ng·g~(-1) to 9.7ng·g~(-1).The MESS-3 standard reference material was determined with this method,and the results of twelve elements were in good agreement with the reference values.The RSD varied from 2.67%to 5.58%,which showed that the method was precise.