硫酸雾测试方法若干问题思考

简述了我国硫酸雾测试方法的发展历史,分析和总结了《固定污染源废气硫酸雾的测定离子色谱法》(HJ 544—2016)存在的一些争议和问题,包括硫酸雾的定义、测试方法的干扰控制等。分析认为,相比《硫酸工业污染物排放标准》(GB 26132—2010),HJ 544—2016对硫酸雾的定义更加合理。实验结果表明:硫酸盐是测试方法条件下的目标物,滤筒可以显著地捕捉硫酸盐。9组样品滤筒中,被测目标物所占比例为7.9%~69.1%;滤筒和前吸收液中,被测目标物所占比例为93.7%~97.8%。HJ 544—2016新增加的两级串联碱液吸收瓶可以较完全地捕集穿透滤筒后的硫酸雾,同时也会捕集SO2。SO2会对硫酸雾测试产生正干扰,约42.9%的SO2在被吸收后转化为硫酸雾。

Consideration on Problems About the Determination of Sulfuric Acid Mist

The development history of the determination of sulfuric acid mist in China is briefly described in this paper.The disputes and problems of Stationary source emission—Determination of sulfuric acid mist—Ion chromatography(HJ 544-2016)are analyzed and summarized,including the definition of sulfuric acid mist and the interference of the method.After analysis,it is concluded that HJ 544-2016 is more reasonable for the definition of sulfuric acid mist compared with Emission standard of pollutants for sulfuric acid industry(GB 21632-2010).Experiments show that sulphate is the target under test conditions.The filter cartridge can capture sulphate remarkably.The proportion of the target in nine groups of sample cartridges ranges from 7.9%to 69.1%,and the proportion of the target in filter cartridge and pre-absorbent liquid ranges from 93.7%to 97.8%.The new two-stage series alkali absorption bottle can completely capture the sulfuric acid mist after penetrating the filter cartridge.The new alkali absorption bottle in HJ 544-2016 can capture SO2 at the same time,which has a positive interference on the sulfuric acid mist test.Under the condition of sulfuric acid mist test,about 42.9%SO2 is absorbed and converted into sulfuric acid mist.