Liu Wen, Ma Long, Abuduwaili Jilili, Li Yaoming
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, People's Republic of China.
Environ Monit Assess. 2017 Aug;189(8):398. doi: 10.1007/s10661-017-6113-1. Epub 2017 Jul 17.
The concentration, distribution, compositional characteristics, and pollution sources of 16 polycyclic aromatic hydrocarbons (PAHs) in the topsoil of Issyk-Kul Lake Basin were studied, and their ecological risks were evaluated in this paper. The total concentration of the 16 PAHs was 68.58-475.95 ng g, with an average of 134.45 ng g. Four-ring PAHs accounted for 43.2% of the total PAHs, two- and three-ring PAHs accounted for 39.4%, and five- and six-ring PAHs accounted for 15.8%. The total concentration of the seven carcinogenic PAHs was 7.66-76.04 ng g, with an average of 30.97 ng g. An analysis of the PAH sources through diagnostic ratio analysis and principal component analysis was carried out. The results showed that the regional soil PAHs were mainly derived from coal, wood, and grass combustion, while traffic and regional industry also had small contributions to the PAHs. The pollution-free samples accounted for 75% and the slightly polluted samples accounted for 25% based on the total concentration of the 16 PAHs. An ecological risk assessment showed that 26.7% of Ac and 3.3% of Pyr and DahA might occasionally produce ecological risks. The toxicity was calculated on the basis of benzo[a]pyrene, and the toxicity equivalent was between 2.48 and 13.78 ng g with an average of 6.23 ng g, which currently does not pose any health risk to human life.
本文研究了伊塞克湖流域表层土壤中16种多环芳烃（PAHs）的浓度、分布、组成特征和污染源，并对其生态风险进行了评估。16种PAHs的总浓度为68.58 - 475.95 ng/g，平均为134.45 ng/g。四环PAHs占总PAHs的43.2%，二环和三环PAHs占39.4%，五环和六环PAHs占15.8%。七种致癌PAHs的总浓度为7.66 - 76.04 ng/g，平均为30.97 ng/g。通过诊断比值分析和主成分分析对PAHs来源进行了分析。结果表明，区域土壤PAHs主要来源于煤、木材和草的燃烧，而交通和区域工业对PAHs也有较小贡献。基于16种PAHs的总浓度，无污染样品占75%，轻度污染样品占25%。生态风险评估表明，26.7%的苊、3.3%的芘和二氢苊可能偶尔产生生态风险。以苯并[a]芘为基础计算毒性，毒性当量在2.48至13.78 ng/g之间，平均为6.23 ng/g，目前对人类生命不构成任何健康风险。
