[芜湖市环境空气中挥发性有机物的特征、大气反应活性及来源解析]

[Characteristics, Atmospheric Reactivity, and Source Apportionment of Ambient Volatile Organic Compounds in Wuhu].

作者信息

Gao Kang, Zhang Hui, Liu Meng-di, Zhao Xiao-Yu, Wu Ting, Jia Qi-Na

机构信息

School of Ecology and Environment, Anhui Normal University, Wuhu 241003, China.

Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Wuhu 241003, China.

出版信息

Huan Jing Ke Xue. 2020 Nov 8;41(11):4885-4894. doi: 10.13227/j.hjkx.202002078.

DOI:10.13227/j.hjkx.202002078

PMID:33124232

Abstract

In this study, the pollution characteristics, photochemical effects, and sources of atmospheric volatile organic compounds (VOCs) in the urban areas of Wuhu were investigated from September 2018 to August 2019. The results showed that the annual average mixing ratio of ambient VOCs in Wuhu was 27.86×10, with the highest values in fall (31.16×10), followed by summer (28.70×10), winter (24.75×10), and spring (24.04×10). The diurnal patterns showed two VOC peaks, due to traffic exhaust, at 08:00-09:00 and 18:00-19:00. The estimated total OFP of VOCs was 255.29 μg·m, and aromatics, olefins, alkanes, OVOCs, and halocarbons contributed 48.83%, 21.04%, 18.32%, 11.47%, and 0.35% to the average OFP, respectively. The total AFP was 1.84 μg·m, among which aromatics and alkanes accounted for 87.69% and 12.31%, respectively. The ratios of B/T/E indicated that atmospheric aromatic hydrocarbons were mainly derived from vehicle exhaust, as well as industry emission and solvent usage. Source apportionment indicated that petroleum evaporation, vehicle exhaust, solvent evaporation, liquefied petroleum gas (LPG), biogenic source, and secondary source shared 11.57%, 34.53%, 16.63%, 20.76%, 3.54%, and 12.97% of ambient VOCs during the sampling period, respectively.

摘要

本研究于2018年9月至2019年8月对芜湖市区大气挥发性有机化合物（VOCs）的污染特征、光化学效应及来源进行了调查。结果表明，芜湖市环境空气中VOCs的年平均混合比为27.86×10，秋季最高（31.16×10），其次是夏季（28.70×10）、冬季（24.75×10）和春季（24.04×10）。日变化模式显示，由于交通尾气排放，VOCs在08:00 - 09:00和18:00 - 19:00出现两个峰值。估算的VOCs总臭氧生成潜势（OFP）为255.29 μg·m，芳烃、烯烃、烷烃、含氧挥发性有机物（OVOCs）和卤代烃对平均OFP的贡献率分别为48.83%、21.04%、18.32%、11.47%和0.35%。总丙烯生成潜势（AFP）为1.84 μg·m，其中芳烃和烷烃分别占87.69%和12.31%。苯/甲苯/乙苯比值表明，大气芳烃主要来源于汽车尾气排放，以及工业排放和溶剂使用。源解析结果表明，在采样期间，石油挥发、汽车尾气排放、溶剂挥发、液化石油气（LPG）、生物源和二次源对环境空气中VOCs的贡献率分别为11.57%、34.53%、16.63%、20.76%、3.54%和12.97%。