PAHs in Chinese atmosphere: Gas/particle partitioning
PAHs in Chinese atmosphere: Gas/particle partitioning
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中国大气中的多环芳烃：气体/颗粒分配
DOI：
10.1016/j.scitotenv.2019.133623
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发表时间：
2019
影响因子：
9.8
通讯作者：
Li Yi-Fan
中科院分区：
文献类型：
--
作者：
Ma Wan-Li;Zhu Fu-Jie;Liu Li-Yan;Jia Hong-Liang;Yang Meng;Li Yi-Fan
气体/颗粒(G/P)分配行为是影响大气中多环芳烃(PAHs)环境归宿的重要因素。通过对中国市区11个监测点一年的监测，获得了16种优先多环芳烃的7647对气态和颗粒物浓度，为研究多环芳烃的G/P分配行为提供了良好的机会。11个采样点的气相和颗粒相中多环芳烃的浓度差异均在一个数量级以上。随着多环芳烃摩尔质量的增加，颗粒相中浓度所占比例逐渐增大。颗粒物相中，中国北方城市∑16PAHs浓度显著高于南方城市(p<； 0.0 5)，分别为83.4 ± 15 1 ng/m 3和33.4 ± 45.5 ng/m 3。气相中∑-16多环芳烃的含量差异不显著。16种多环芳烃的对数Kp(G/P分配系数/商)范围为−5.65 m~3/μg~2.34 m~3/μg，平均值为−2.01 ± 1.65 m~3/μg。11个采样点各点多环芳烃的logKP值不在同一水平。此外，除阿昔洛韦、流感和大哈外，中国北方和南方城市之间的16种多环芳烃的logKP均有显著差异(p<； 0.05)。不同同系物和不同环的多环芳烃与KP之间存在一个数量级以上的差异，这主要是由于它们的物理化学性质造成的。研究结果为多环芳烃的G/P分配研究提供了大量的Kp数据库，具有重要的现实意义。
The gas/particle (G/P) partitioning behavior is an important factor for the environmental fate of polycyclic aromatic hydrocarbons (PAHs) in atmosphere. Based on one year monitoring program at 11 urban sites across China, 7647 pairs of gaseous and particulate concentrations were obtained for 16 priority PAHs, which provided a good opportunity to study the G/P partitioning behavior of PAHs. The concentrations of PAHs in both gas and particle phases were not in the same level among the 11 sites with a difference of more than one orders of magnitude. Along with the increase of molar weight of PAHs, the proportion of concentration in particle phase was increasing. In particle phase, the concentrations of ∑16PAHs in northern Chinese cities were significantly (p< 0.05) higher than those in southern Chinese cities with the average concentrations of 83.4 ± 151 ng/m3and 33.4 ± 45.5 ng/m3, respectively. However, non-significant difference was found with ∑16PAHs in gas phase. The values of logKP(the G/P partitioning coefficient/quotient) ranged from −5.65 m3/μg to 2.34 m3/μg, with the mean value of −2.01 ± 1.65 m3/μg for the 16 PAHs. The values of logKPfor individual PAHs at the 11 sites were not in the same level. Furthermore, significant difference (p< 0.05) with logKPof the 16 PAHs was found between northern Chinese cities and southern Chinese cities except for Acy, Flu and DahA. More than one orders of magnitude difference withKPwere observed for different congeners and different rings PAHs, which are mainly caused by their physical-chemical properties. The results of this study provided large database ofKP, which is necessary and important to the research field of the G/P partitioning of PAHs.