摘要
利用大气细颗粒物水溶性离子在线监测仪(Marga 1S)分别与API 100E和Thermo 43i同时测量环境空气和二氧化硫(SO_(2))标气,进而评估了湿式旋转溶蚀器对SO_(2)吸收效率及其测量干扰.研究结果显示,基于API 100E和Marga 1S测得的2017年南京市环境空气SO_(2)浓度分别为(17.1±7.7)μg·m^(-3)和(9.6±5.9)μg·m^(-3),Marga 1S较API 100E低43.8%,当API 100E监测SO_(2)浓度低于25μg·m^(-3)时,API100E和Marga 1S的相对误差较大,秋、冬季Marga 1S测量结果与API 100E最为接近,夏季Marga1S测量结果偏低;基于实验室研究发现,Marga 1S和Thermo 43i的相关系数r为0.999,相关性较好,Marga 1S的测量结果偏低,与环境空气结论一致.湿式旋转溶蚀器对SO_(2)吸收效率为82.1%-91.7%,随着SO_(2)浓度逐渐升高,湿式旋转溶蚀器的吸收效率逐渐升高,60μg·m^(-3)附近时吸收效率趋于稳定.高浓度SO_(2)条件下,颗粒态中SO_(4)^(2-)残留率介于0.43%-1.34%之间,高浓度SO_(2)对颗粒物SO_(4)^(2-)组分监测影响较小.
Utilizing Marga 1 S together with API 100 E and Thermo 43 i to simultaneously measure sulfur dioxide(SO_(2)) concentration in ambient air and standard gas respectively,we evaluated the absorption efficiency of SO_(2) by wet rotating denuder and its measurement interference.Atmospheric SO_(2)concentration in Nanjing in 2017 measured by API 100 E and Marga 1 S were(17.1±7.7)μg·m^(-3) and(9.6±5.9)μg·m^(-3) respectively,with Marga 1 S 43.8%lower than API 100 E.When atmospheric SO_(2) concentration was below 25μg·m^(-3) monitored by API 100 E,Marga 1 S had a large relative deviation from API 100 E.Marga 1 S measurenments in ambient air were closest to API 100 E in autumn and winter,and lower in summer.While measuring standard gas,Marga 1 S had a high correlation of 0.999 with Thermo 43 i.However its measurement were still lower than Thermo 43 i,as was stated by the measurements in ambient air.The absorption efficiency of wet rotating denuder for SO_(2)was 82.1%-91.7%,gradually.increased with SO_(2)concentration and tended to stabilize near60μg·m^(-3).At high SO_(2)concentration,the SO_(4)^(2-)residual ratio in the particulate state was0.43%-1.34%.Therefore high SO_(2)concentration had little effect on the measurment of particulate SO_(4)^(2-)component.
作者
秦艳红
秦玮
蒋自强
袁琦
陈诚
高洁
刘晨
QIN Yanhong;QIN Wei;JIANG Ziqiang;YUAN Qi;CHEN Cheng;GAO Jie;LIU Chen(Jiangsu Environmental Monitoring Center,Nanjing,210019,China;Sino-Metrohm Technology Ltd.,Shanghai,200335,China;Nanjing Guosiyuan Trading Co.,Ltd.,Nanjing,210002,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第12期3947-3954,共8页
Environmental Chemistry
基金
江苏省PM2.5与臭氧协同控制重大专项(2019023)
国家自然科学基金(41601193)
江苏省自然科学基金(BK20160622)
国家重点研发计划(2016YFC0200506)
江苏省环境监测科研基金(1918)资助。
