Comparison of Barium Chromate Spectrophotometry(Thermal Method)and Ion Chromatography in Determining Sulfate Content in Drinking Water
Objective:To compare the results of barium chromate spectrophotometry(thermal method)and ion chromatography in determining sulfate content in drinking water,and to explore the differences,advantages and disadvantages of the two methods.Method:The sulfate content in 26 tap water samples from 13 townships in the jurisdiction of Mile city was determined by barium chromate spectrophotometry(thermal method)and ion chromatography,respectively,and the results of the two methods were tested by paired t-test.Result:There was no statistically significant difference between the two methods in the determination of chloride in 26 water samples(t=0.865 7,P＞0.05).The detection limit of ion chromatography was lower than that of barium chromate spectrophotometry.Both methods can achieve good accuracy and recovery rate in the determination of sulfate solutions with the same concentration,but the precision of ion chromatography is significantly higher than that of spectrophotometry,especially for water samples with low sulfate content.Conclusion:When the sulfate content in drinking water is low,ion chromatography has a lower detection limit and can save time in testing a large number of water samples,while measuring the content of other anions at the same time.However,spectrophotometry has a lower detection cost.
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