离子色谱法测定气体中痕量二氧化硫

Determination of Trace Amounts of Sulfur Dioxide in Gas by Ion Chromatography

建立了测定气体中痕量二氧化硫的离子色谱法。采用氢氧化钠–过氧化氢溶液为吸收液，将气体样品中痕量二氧化硫转化为硫酸根离子，以离子色谱法测定硫酸根离子，从而得到气体中二氧化硫含量。二氧化硫气体含量在1～100μL／L范围内与色谱峰面积线性关系良好，相关系数为0.9999。二氧化硫的检出限为0.1μg／L，测量结果的重复性小于2%（n=6），测定标准样品的回收率在98.1%～99.6%之间，准确度优于对照方法。

An ion chromatography method was set up to determine sulfur dioxide in gas. Sodium hydroxide–hydrogen peroxide solution was used to absorb trace amounts of sulfur dioxide in gas, and then sulfur dioxide was converted to sulfate ion which was determined by ion chromatography, and the content of sulfur dioxide in gas was defined.The content of sulfur dioxide was linear with chromatographic peak area in the range of 1–100 μL/L with the correlation coefficient of 0.999 9. The detection limit of sulfur dioxide was 0.1 μg/L, the results of repeated measurements was less than 2%(n=6), and the recoveries of standard sample were 98.1%–99.6%. The method showed that the accuracy was better than the reference method.