State Key Laboratory of Organic Geochemistry and Guangdong province Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
State Key Laboratory of Organic Geochemistry and Guangdong province Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
Environ Pollut. 2020 Jul;262:114267. doi: 10.1016/j.envpol.2020.114267. Epub 2020 Feb 27.
Multiple types of persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), polychlorinated naphthalenes (PCNs), and hexachlorobenzene (HCB), can be unintentionally released from combustion or thermal industrial processes, which are speculated to be the main sources of these contaminants, as they were banned on production and use since several decades ago. In this study, concentrations and sources of 40 PCBs, 39 PCNs, and HCB were analyzed in air samples collected during the period 2012-2015 at a background site in east China. ΣPCBs, ΣPCNs, and HCB were in the range of 9-341 pg/m, 6-143 pg/m, and 14-522 pg/m, respectively. Seasonal characteristics with high levels in winter and low levels in summer were observed for PCNs and HCB. PCBs also exhibited slightly higher levels in winter. Source apportionment was conducted, using polycyclic aromatic hydrocarbons (PAHs) as combustion sources indicator, combined with principal component analysis (PCA) and positive matrix factorization (PMF) model. The results indicated that the legacy of past produced and used commercial PCBs was the dominant contributor (∼56%) to the selected PCBs in the atmosphere in east China. PCNs were mainly emitted from combustion sources (∼64%), whereas HCB almost entirely originated from combustion process (>90%).
多种持久性有机污染物（POPs），如多氯联苯（PCBs）、多氯萘（PCNs）和六氯苯（HCB），可能会在燃烧或热工业过程中意外释放。这些污染物被认为是主要来源，因为它们在几十年前就被禁止生产和使用。在本研究中，分析了 2012 年至 2015 年期间在中国东部背景地区采集的空气样本中 40 种 PCBs、39 种 PCNs 和 HCB 的浓度和来源。ΣPCBs、ΣPCNs 和 HCB 的浓度范围分别为 9-341 pg/m、6-143 pg/m 和 14-522 pg/m。PCNs 和 HCB 表现出冬季水平较高、夏季水平较低的季节性特征。使用多环芳烃（PAHs）作为燃烧源指标，结合主成分分析（PCA）和正定矩阵因子分解（PMF）模型进行了源分配。结果表明，过去生产和使用的商用 PCBs 的遗留物是大气中选定 PCBs 的主要贡献者（约 56%）。PCNs 主要来自燃烧源（约 64%），而 HCB 几乎完全来自燃烧过程（>90%）。
