Abstract The element contents of lead and nickel in drinking water were determined by ICP-MS method, and uncertainties of the two approaches preparing standard curves including volumetric method and weighing method were evaluated. The sources of uncertainty were analyzed, and the components of uncertainty were evaluated and the expanded uncertainty was synthesized. According to the established uncertainty evaluation method, the relative uncertainty of volumetric method is urel(Pb)=2.8%,urel(Ni)=2.4%; the relative uncertainty of weighing method is urel(Pb)=1.6%,urel(Ni)=1.0%. The established uncertainty evaluation procedure is suitable for the determination of heavy metal elements in drinking water by ICP-MS. By comparing the uncertainty and relative component contribution of the volumetric method and weighing method, improvements were proposed from the perspective of standard solution configuration. The scientific basis for strengthening the detection of heavy metals in drinking water was provided and the safety of water quality was ensured.
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2022, Vol. 43 
