固定污染源废气中三氧化硫测试方法初探

Determination of SO_3 in Stationary Pollution Source

建立了异丙醇吸收-分光光度法测试固定污染源中三氧化硫(SO_3)的方法,分别连续9次测试低、中、高3个质量浓度的SO_3烟气。测试结果表明,相对误差分别为7. 5%,-2. 6%和6. 7%,相对标准偏差分别为3. 3%,1. 7%和4. 1%,方法的准确度和精密度较好。方法检出限为0. 1 mg/m^3,测定下限为0. 4 mg/m^3。二氧化硫(SO_2)、一氧化碳(CO)、氮氧化物(NO_x)、硫化氢(H_2S)、含湿量、烟尘等因素对方法的干扰较小,方法适用于现场测试。

A method for determination of SO3 in stationary sources by isopropyl alcohol absorption spectrophotometry was established.The SO3 flue gas with low,medium and high mass concentration was tested 9 times in succession. The results showed the relative errors were 7. 5%,-2. 6% and 6. 7% respectively,RSDs were 3. 3 %,1. 7 % and 4. 1%. The accuracy and precision of the method are good. The detection limit was 0. 1 mg/m3 and the limit of quantitation was 0. 4 mg/m3. The method shows slight interference from sulfur dioxide( SO2),carbon monoxide( CO),nitrogen oxides( NOx),hydrogen sulfide( H2S),moisture content,smoke and other factors. The method is suitable for field test.