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Determination of lead content in the plastic by ICP and AAS using HI reduction - PbSO4 dissolution method  

Lee, Hyun-Ja (Materials & Components Standards Division Agency for Technology and Standards)
Kim, Sang-Kyung (Materials & Components Standards Division Agency for Technology and Standards)
Lee, Se-Jin (Materials & Components Standards Division Agency for Technology and Standards)
Lee, Hyun-A (Materials & Components Standards Division Agency for Technology and Standards)
Publication Information
Analytical Science and Technology / v.17, no.5, 2004 , pp. 369-374 More about this Journal
Abstract
Plastic was decomposed with nitric acid after being carbonized by sulfuric acid. Then excess sulfuric acid and nitric acid was removed by evaporating and drying. Precipitated $SO{_4}^{-2}$ ion of $PbSO_4$ was resolved itself into $H_2S$ by HI in hydrochloric acid and was volatilized. Then $Pb^{+2}$ was dissolved and was measured by AAS and ICP. The test for reproducibility using PVC-Pb standard material (690-34610mg/kg) was conducted and the accuracy was more than 99.9% compared with the estimated concentration. The precision by AAS was 99.8% and that of ICP was 99.9%.
Keywords
Plastics; Lead; Hydroiodic acid reduction; AAS; ICP;
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