Xing Jia-Li, Cao Fang, Wang Qian, Zhang Yu-Xian, Zhang Yan-Lin
International Joint Laboratory on Climate and Environment Change (ILCEC), Yale-NUIST Center on Atmospheric Environment, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2022 Jun 8;43(6):2895-2905. doi: 10.13227/j.hjkx.202110031.
The non-polar compounds in atmospheric fine particles (PM) mainly include polycyclic aromatic hydrocarbons (PAHs) and normal alkanes (-alkanes), etc., which are usually used to identify the source of the air pollution and have a great important impact on human health and the environment. To study the pollution characteristics and sources of non-polar organic aerosols in the background point PM in Guangxi, from November 2017 to October 2018, 17 types of PAHs and 20 types of -alkanes were analyzed on PM samples collected in the field. It was found that the annual average concentrations of PAHs and -alkanes were 4.28±4.25 ng·m and 13.7±14.72 ng·m, respectively. The seasonal change was as follows:winter[(7.86±5.19) ng·m, (27.51±16.90) ng·m]>spring[(2.73±1.76) ng·m, (7.64±4.71) ng·m]>autumn[(2.34±145) ng·m, (7.01±4.55) ng·m]>summer[(1.91±1.67) ng·m, (3.98±3.12) ng·m]. In PAHs, 5-ring and 6-ring molecules accounted for more than 60%, followed by low- and medium-ring molecules (4-ring and 3-ring). The high molecular weight of -alkanes was relatively high (C29>C31>C27), and the odd and even carbon numbers were significantly different. In addition, combined with the feature ratio method, principal component analysis method, and backward trajectory joint verification, it was found that 41.5% of non-organic aerosols in winter were affected by maritime traffic emissions and ocean source transportation, and 36.7% of the pollution was explained by the coal burning and local biomass burning; 25.2% of the pollution in spring came from biomass combustion and transportation, and 45.0% was attributed to marine transportation in the southern part of the study area and higher plant wax emissions pollution; 53.4% of pollution in summer came from polluted ship emissions, and 10.6% of pollution came from transportation in Southwest Thailand Source transportation. The organic aerosols at the background sites in Guangxi were affected by the combined effects of local emissions and transmission sources.
大气细颗粒物（PM）中的非极性化合物主要包括多环芳烃（PAHs）和正构烷烃（-alkanes）等，它们通常用于识别空气污染来源，对人类健康和环境有重大影响。为研究广西背景点PM中极性有机气溶胶的污染特征和来源，于2017年11月至2018年10月，对现场采集的PM样本分析了17种PAHs和20种-alkanes。结果发现，PAHs和-alkanes的年均浓度分别为4.28±4.25 ng·m和13.7±14.72 ng·m。季节变化如下：冬季[（7.86±5.19）ng·m，（27.51±16.90）ng·m]>春季[（2.73±1.76）ng·m，（7.64±4.71）ng·m]>秋季[（2.34±1.45）ng·m，（7.01±4.55）ng·m]>夏季[（1.91±1.67）ng·m，（3.98±3.12）ng·m]。在PAHs中，5环和6环分子占比超过60%，其次是低环和中环分子（4环和3环）。-alkanes的高分子量相对较高（C29>C31>C27），奇碳数和偶碳数差异显著。此外，结合特征比值法、主成分分析法和后向轨迹联合验证发现，冬季41.5%的非有机气溶胶受海上交通排放和海洋源输送影响，36.7%的污染可由燃煤和当地生物质燃烧解释；春季25.2%的污染来自生物质燃烧和输送，45.0%归因于研究区域南部的海洋输送和高等植物蜡排放污染；夏季53.4%的污染来自污染船舶排放，10.6%的污染来自泰国西南部源输送。广西背景点的有机气溶胶受本地排放和传输源的综合影响。
