Determination of Cr(Ⅵ),Cd,Hg,Pb in Toy Packing Materials by ICP-AES

An ICP-AES method for the determination of Cr(Ⅵ),Cd,Hg and Pb in toy packing materials was proposed in this paper.The sample was treated by the conventional acidic wet-digestion or the microwave assisted digestion,the solution obtained was then analyzed by ICP-AES.Chromium(Ⅲ) was separated from Cr(Ⅵ) in the solution after coprecipitation with ferric hydroxide when the total amount of Cr,Cd,Hg and Pb was over 100 mg·kg-1.Recovery of the method was ranged from 91.2% to 103.5% and values of RSD′s (n=11) were less than 3%.