Department of Environmental Science and Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, 430072, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
Chemosphere. 2022 Jul;299:134298. doi: 10.1016/j.chemosphere.2022.134298. Epub 2022 Mar 21.
Total suspended particles (TSP) and gaseous samples were collected by using a high-volume sampler from March 2012 to March 2013 and January 2018 to January 2019 at a background site (Jinsha, JSH) in central China to study the chemical characteristics, seasonal variations, and potential sources of polycyclic aromatic hydrocarbons (PAHs). The average concentrations of ∑PAHs were 24.55 ± 9.19 ng m in 2012/2013 and 20.98 ± 9.77 ng m in 2018/2019. Low-ring PAHs were more concentrated in gas phase while high-ring PAHs were prone into particle phase. The concentrations of PAHs in the two sampling years were high in winter but low in summer and autumn. The relationships between the gas concentrations of PAHs and temperature indicated that most PAHs were influenced by long-range atmospheric transport (LRAT) in 2012/2013 and in 2018/2019, excluding anthracene (Ant) and pyrene (Pyr) were partially affected by air-surface re-volatilization in 2012/2013. The source of atmospheric PAHs at JSH was similar in 2012/2013 and 2018/2019,which was mainly due to the LRAT of PAHs emitted from biomass/fossil fuel combustion in the northern area of JSH. From 2012/2013 to 2018/2019, there was no significant difference between the concentrations of PAHs in spring and winter, whereas the concentrations of PAHs decreased from 2012/2013 to 2018/2019 in summer. In all, the control of PAHs at the source region was partially effective from 2012/2013 to 2018/2019.
总悬浮颗粒物（TSP）和气态样品分别于 2012 年 3 月至 2013 年 3 月和 2018 年 1 月至 2019 年 1 月在中国中部背景站点（金沙，JSH）使用大容量采样器采集，以研究多环芳烃（PAHs）的化学特征、季节性变化和潜在来源。2012/2013 年和 2018/2019 年，∑PAHs 的平均浓度分别为 24.55±9.19ng·m -3 和 20.98±9.77ng·m -3。低环 PAHs 在气相中更集中，而高环 PAHs 则容易进入颗粒相。两个采样年份的 PAHs 浓度在冬季较高，而在夏季和秋季较低。PAHs 气相浓度与温度的关系表明，2012/2013 年和 2018/2019 年，大多数 PAHs 受长程大气传输（LRAT）的影响，而蒽（Ant）和芘（Pyr）则部分受 2012/2013 年空气-表面再挥发的影响。2012/2013 年和 2018/2019 年，金沙站大气 PAHs 的来源相似，主要是由于金沙站北部地区生物质/化石燃料燃烧排放的 PAHs 的 LRAT。从 2012/2013 年到 2018/2019 年，春季和冬季 PAHs 浓度没有显著差异，而 2012/2013 年到 2018/2019 年夏季 PAHs 浓度降低。总体而言，2012/2013 年至 2018/2019 年，源区 PAHs 的控制效果部分有效。
