Simultaneous Determination of Dithionate and Sulfate in Leaching Solution from SO2-Leaching Pyrolusite by Ion Chromatography

• DOI: 10.1021/acs.energyfuels.6b01333
• Publication Date: 2016-09-09T00:29:18Z
• Authors: Bing Qu; Wenli Hu; Lin Deng; Weiyi Sun; Sanglan Ding; Zhiwei Gan; Shijun Su
• Keywords: 01 natural sciences; 6. Clean water; 0104 chemical sciences

A sensitive method for simultaneous determination of dithionate and sulfate using ion chromatography equipped with a suppressed conductivity detector was developed. The flow rate was 1.2 mL min–1, and the mobile phase contained KOH, which was gradient-generated by an automatic generator. The detection limits were 0.63 and 0.42 mg L–1 for dithionate and sulfate, respectively. The correlation coefficients of the calibration curves were greater than 0.997. The linearity ranges were 5–200 mg L–1, and the accuracies were in the range of 99.5–111%. The proposed method was rapid, accurate, and fully validated. Finally, the method was successfully applied to the analysis of the leaching liquid and slurry by SO2-leaching pyrolusite.