【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。更多还原

【Abstract】 The concentration of organic carbon（OC）, elemental carbon（EC） and total carbon（TC） in fine particulate matter(PM_2.5) 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.更多还原