ICP-MS Determination of 9 Restricted Elements in Plastic Parts of Electrical and Electronic Products

The sample of plastic parts of electrical and electronic products was treated with HNO3 and H2O2 by microwave assisted digestion, and the contents of 9 restricted elements, including Pb, Cd, Hg, Cr, Co, As, Sn, Si and B in the sample solution were determined by ICP-MS. The interferences were eliminated by suitable internal standard elements and correcton formula. The values of detection limit (3σ) of the method found were in the range of 0.01-4.38 μg·kg-1. The proposed method was applied in the analysis of samples of different plastic parts, giving values of recovery in the range of 100.2%-109.6%, and RSD′s (n=7) in the range of 1.7%-5.7%.