In this paper,lanthanum(La)in corn products was determined by ICP-MS method,and all sources of uncertainty were calculated by mathematical modeling,and the relative standard uncertainty was obtained,and the expanded uncertainty is(27.9±2.02)µg/kg,k=2.By calculating the specific gravity of relative standard uncertainty,it can be concluded that the source of relative standard uncertainty in this experiment is mainly cause by the preparation process of the standard solution that contained in standard curve.
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