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PM2.5中OC/EC测定的离线分析法与在线分析法比较
引用本文:刘琼玉,谈静,钟章雄,龚海群,胡珂,梁胜文,米铁.PM2.5中OC/EC测定的离线分析法与在线分析法比较[J].中国环境监测,2019,35(4):123-130.
作者姓名:刘琼玉  谈静  钟章雄  龚海群  胡珂  梁胜文  米铁
作者单位:工业烟尘污染控制湖北省重点实验室(江汉大学);武汉市环境监测中心
基金项目:湖北省高等学校优秀中青年科技创新团队项目(T201420);武汉研究院开放性课题资助项目(IWHS2016332)
摘    要:采用离线分析法和在线分析法同步监测了武汉市PM_(2.5)中有机碳(OC)、元素碳(EC)和总碳(TC)的浓度,分析了2种方法的差别。结果表明,离线分析法与在线分析法对TC的测定结果具有很好的可比性,2种方法对TC的测定结果显著相关(r=0.970 9)。离线分析法得到的OC浓度普遍高于在线分析法,前者为后者的1.12倍,造成OC结果差异的主要原因可能是采样系统的差异。2种方法对EC测定的相关性较低(r=0.763 0),且2种方法对EC测定的精密度(相对偏差为13.14%)也不如其对TC和OC测定的精密度(相对偏差分别为3.42%和5.95%),造成EC结果差异的原因较复杂。离线分析法测得的OC/EC值明显高于在线分析法,鉴于OC/EC值在颗粒物源解析研究中具有重要意义,需要规范OC/EC分析方法。

关 键 词:离线分析  在线分析  细颗粒物  碳质组分  OC/EC值
收稿时间:2018/5/1 0:00:00
修稿时间:2019/5/15 0:00:00

Comparison of Off-line Analysis and On-line Analysis for Organic Carbon and Elemental Carbon in PM2.5
LIU Qiongyu,TAN Jing,ZHONG Zhangxiong,GONG Haiqun,HU Ke,LIANG Shengwen and MI Tie.Comparison of Off-line Analysis and On-line Analysis for Organic Carbon and Elemental Carbon in PM2.5[J].Environmental Monitoring in China,2019,35(4):123-130.
Authors:LIU Qiongyu  TAN Jing  ZHONG Zhangxiong  GONG Haiqun  HU Ke  LIANG Shengwen and MI Tie
Institution:Hubei Key Laboratory of Industrial Fume and Dust Pollution Control,Jianghan University,Wuhan 430056,China,Hubei Key Laboratory of Industrial Fume and Dust Pollution Control,Jianghan University,Wuhan 430056,China,Wuhan Environmental Monitoring Centre,Wuhan 430015,China,Wuhan Environmental Monitoring Centre,Wuhan 430015,China,Wuhan Environmental Monitoring Centre,Wuhan 430015,China,Wuhan Environmental Monitoring Centre,Wuhan 430015,China and Hubei Key Laboratory of Industrial Fume and Dust Pollution Control,Jianghan University,Wuhan 430056,China
Abstract:The concentration of organic carbon (OC), elemental carbon (EC) and total carbon (TC) in fine particulate matter (PM2.5) of Wuhan city were simultaneously analyzed by off-line analysis and on-line analysis methods. The differences between the results of these two methods were compared. The results showed that the concentration of total carbon (TC) was well correlated with off-line analysis and on-line analysis, with the correlation coefficients r was 0.9709, these two methods were in good agreement with TC determination. The concentration of OC obtained by off-line analysis was generally higher than that of OC obtained by on-line analysis, with the former was 1.12 times higher than the latter. The main reason that the results of OC obtained by off-line analysis was higher than on-line analysis may be due to the difference of sampling system. The correlation between these two methods for EC determination was lower (r=0.7630), and the precision (relative deviation was 13.14%) of these two methods for EC determination was also lower than that for TC and OC determination (relative deviations were 3.42% and 5.95%, respectively). The reasons for the differences in EC results were more complicated. The OC/EC ratio measured by off-line analysis method was obviously higher than on-line analysis method. In view of the significance of OC/EC ratio in source apportionment of particulates, it is need to standardize the OC/EC analysis method.
Keywords:off-line analysis  on-line analysis  fine particulate matter  carbon species  OC/EC
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