分别采用10%盐酸+5%硝酸、10%盐酸和剑桥滤片捕集主流烟气中的砷,捕集后10%盐酸+5%硝酸和10%盐酸用水浴沸腾加热3 h,剑桥滤片用10%盐酸+5%硝酸超声浸提1h,处理后的样品用原子荧光光谱法检测砷,3种方法的平均回收率分别为94.3%、99.8%、96.3%,3种方法捕集主流烟气中砷的相对标准偏差在6.90%—9.86%之间,同时发现硝酸浓度大于等于8%时,对测定砷产生负效应,其中采用10%盐酸+5%硝酸对测定砷无负效应。 Arsenic in mainstream flue gas was captured by 10% hydrochloric acid + 5% nitric acid, 10% hydrochloric acid and Cambridge filter respectively. After collecting, 10% hydrochloric acid + 5% nitric acid and 10% hydrochloric acid were boiled in water bath for 3 h. The samples were treated with 10% hydrochloric acid and 5% nitric acid for 1 h, and the treated samples were detected by atomic fluorescence spectrometry. The average recoveries of the three methods were 94.3%, 99.8% and 96.3%, respectively. The relative standard deviation of arsenic in gas ranged from 6.90% -9.86%. At the same time it was found that the concentration of nitric acid was greater than or equal to 8%, which had a negative effect on the determination of arsenic. No adverse effect on the determination of arsenic was observed with 10% hydrochloric acid and 5% nitric acid.