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ICP-AES Determination of Lead,Cadmium,Chromium and Mercury in Lead-Tin Solder Alloy

ZHONG Zhi-guang,ZHAI Cui-ping,LI Cheng,ZHANG Zhen-kun,HUANG Wei,XIE Jing,LI Zheng-jun,ZHANG Shao-ping,ZHENG Jian-guo(Guangdong Entry-Exit Inspection and Quarantine Bureau,Guangzhou 510623,China)ZHU Bin(Lab-Tech Co Ltd.,Guangzhou 510260,China)  
The solder sample was digested with HNO3, HF and H2O2 assisted by micro-wave heating.Boric acid was added to complex with excess HF.The sample solution in dilute HNO3 was used for the simultaneous determination of Pb,Cd,Cr and Hg by the DUO-ICP-AES.Detection limit(3S) found for these 4 elements were in the range of 0.002 1-0.017 mg·L-1.Tests for precision and recovery were made,and values of RSD′s(n=11) and recovery obtained were in the ranges of 0.25%-3.4% and 94.9%-101.0% respectively.
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