Based Perchlorate is a new type of pollutant in drinking water,which is harmful to human health.The newly promulgated"Standards for Drinking Water Quality"(GB 5749-2022)has been listed as an expanded indicator.The uncertainty of determination of perchlorate in drinking water by ion chromatography was evaluated,and the factors affecting the accuracy of the result were determined.On the Standard Test Method for Drinking Water Part 5:Inorganic Nonmetallic Indicators(GB/T 5750.5-2023),the perchlorate in drinking water was measured by ion chromatography,and the uncertainty introduced in each step was analyzed and calculated.And evaluate its expanded uncertainty.The perchlorate concentration in drinking water was 0.101 mg/L and the extended uncertainty was 0.005 mg/L(k=2).The measurement uncertainty is mainly introduced from six aspects,namely,the standard material itself,the preparation of standard working fluids,the preparation of series of standard working fluids,the determination of sample repeatability,the recovery rate and the main equipment.The most important factor affecting the total uncertainty is the uncertainty introduced in the preparation process of standard series working fluids.
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