Determination of Lead in Red Wine for CCQM-K30 International Comparison by using ID-ICPMS

The content of lead in red wine for CCQM K30 international key comparison is determined by using isotope dilution mass spectrometry (IDMS). This test almost reach detect limit of the method because the content of lead in red wine was only 3 ng/g and the procedure blank was about 0.3 ng. The comparison results indicate that it is easy to achieve agreements using IDMS. In uncertainty analysis, all of the factors about IDMS method were considered. But, procedure blank took great inference to experiment precision and enlarged the total uncertainty. Therefore the controls of procedure blank were very important for the analysis of ultra trace concentration of samples.