Uncertainty Evaluation of Pb Content in Water by ICP-MS
Objective To evaluate the uncertainty evaluation of Pb content in water by ICP-MS.Methods The determination of Pb content in water was carried out according to GB 5009.268-2016.The factors of the uncertainty in the whole process of the experiment were systematically analyzed,and the results of the uncertainty and the expanded uncertainty were calculated by CNAS-GL006-2019(Guidance on quantifying uncertainty in chemical analysis)and JJF 1059.1-2012(Evaluation and expression of uncertainty in measurement).Results When the Pb content in water was 0.247mg/L and the confidence probability was 95%,the combined standard uncertainty was 0.018mg/L,and the expanded uncertainty was 0.036mg/L(k=2).Conclusion Calibration of ICP-MS and standard solution was the predominant source of uncertainty measurement results for Pb in water.
NETL
NSTL
万方数据
维普
