Abstract:

An ion chromatography method for determining the sulfate ion content in high concentration bittern was establi-shed.According to the chromatographic conditions,the sulfate ion series standard solution was analyzed by ion chromatogra-phy to establish a standard curve of peak area and mass concentration of the sulfate ion chromatographic peak.The high con-centration bittern sample was diluted and filtered by the solid phase extraction sodium column（SPE-Na column） and needle filtration Filter,the high concentration bittern sample was determined by ion chromatograph according to the chromatographic conditions.The content of sulfate ion in the high concentration bittern was calculated by sulfate peak area of the high concentration bittern,standard curve and sample dilution factor.The results showed that the linear relationship of the standard curve was good with the sulfate ion mass concentration in the range of 0.5~50.0 mg/L,the detection limit was 0.13 mg/L,the relative standard deviation（RSD） of 7 parallel measurements of the high concentration bittern samples was 0.161%,the standard addition recovery of six determinations ranged from 96.68% to 99.20%,the precision and accuracy of the results was good.The method was simple in sample processing and rapid in analysis,and can be used for the detection and analysis of sulfate ion in the high concentration bittern.

Key words: ion chromatography, high concentration bittern, sulfate ion