Comparison of Three Methods for Determination of Iodide in Water
Objective:To determine iodine content in water by ion chromatography,cerium sulfate catalytic spectrophotometry and inductively coupled plasma mass spectrometry,and to analyze the advantages and disadvantages of the three methods through experimental comparison.Method:Quality control samples were selected as experimental objects,and the concentration of iodine in water of each experimental group was determined according to the experimental steps of the three methods.Result:The linear relationship of the three detection methods all meet the actual detection requirements,and the correlation coefficient R2≥0.999.The detection limit of inductively coupled plasma mass spectrometry was 0.6 μg·L-1,the spiked recovery rate was 100.8%,and RSD was 0.36%～0.45%.The detection limit of cerium sulfate catalytic spectrophotometry was 1.2 μg·L-1,the spiked recovery rate was 84.4%,and RSD was 0.80%～1.91%.The detection limit of ion chromatography was 8 μg·L-1,the spiked recovery rate was 91.4%,and RSD was 0.23%～1.11%.Conclusion:The three detection methods have a wide range of detection,high sensitivity,and good precision and accuracy,and can accurately determine the content of iodide in water.
iodideion chromatographycerium sulfate catalytic spectrophotometryinductively coupled plasma mass spectrometry
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