Study on the Determination of Perchlorate in Drinking Water by Ion Chromatography
An analytical for deterniination of trace amounts of perchlorate in drinking water was established by ion chromatography.After the sample was collected,it was filtered by 0.22 μm microporous filter membrane to remove insoluble matter and then introduced into ion chromatography with sample injection of 100 μL.Use Ion PacAS19 analytical column as the chromatographic column,with a column temperature of 30℃and a conductivity cell temperature of 35℃.Use 45.0 mmol/L potassium hydroxide solution as the eluent for online gradient elution,with a flow rate of 1.0 mL/min.The results indicated that perchlorate had good linearity within the range of 0～0.500 mg/L.The correlation ooefficient was 0.9999 and the adding standard recoveries were 96.0%～98.5%.The method detection limit(S/N=3)was 0.005 mg/L,determination limit(S/N=10)was 0.015 mg/L,and the relative standard deviations RSD was 0.46%.This method has a shorter retention time,higher recovery rate of the added standard,and lower detection limit,which can meet meet the detection requirements of the perchlorate limit mass concentration(0.07 mg/L)of drinking water quality standards in our country and suitable for the detection of perchlorate in a large number of drinking water samples.
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