Urbanization-related changes in soil PAHs and potential health risks of emission sources in a township in Southern Jiangsu, China
Urbanization-related changes in soil PAHs and potential health risks of emission sources in a township in Southern Jiangsu, China
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DOI：
10.1016/j.scitotenv.2016.09.106
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发表时间：
2017-01-01
影响因子：
9.8
通讯作者：
Fan, Xiaoting
中科院分区：
文献类型：
--
作者：
Cao, Hongbin;Chao, Sihong;Fan, Xiaoting
以人口聚集、工业发展和交通负荷增加为特征的城市化可能会改变当地多环芳烃(PAH)的排放及其相关的健康风险。为了研究这些变化，我们于2009年和2014年在苏南一个快速发展的小城镇(中国)采集了土壤样品，并用气相色谱-质谱仪测定了16种多环芳烃的浓度。尽管多环芳烃总量从4586.6 ng/g降至640.6 ng/g，但由于多环芳烃来源的改变，高相对分子质量多环芳烃苯并(B)荧菲和苯并(A)芘的浓度有所增加。正矩阵分解的来源解析表明，对土壤多环芳烃贡献率最高的两种来源从2009年的生物质燃烧(42%)和煤燃烧(32%)转变为2014年的煤、生物质和天然气燃烧(35%)和柴油燃烧(33%)。然而，相关健康风险最高的两个来源是两年的柴油和汽油燃烧。通过偶然摄入和皮肤接触接触土壤中多环芳烃的居民终身癌症风险从1.75x10(-6)下降到1.60x10(-6)。禁止露天焚烧秸秆和用天然气取代煤炭抵消了城市化程度提高带来的PAH健康风险。(C)2016爱思唯尔B.V.保留所有权利。
Urbanization, which is characterized by population aggregation, industrial development, and increased traffic load, may change local polycyclic aromatic hydrocarbons (PAH) emissions and their associated health risks. To investigate these changes, we collected soil samples in 2009 and 2014 in a rapidly developing small town in Southern Jiangsu (China) and measured the concentrations of 16 PAHs via gas chromatography-mass spectrometry. Although the total PAHs decreased from 4586.6 to 640.6 ng/g, the concentrations of the high-molecularweight PAHs benzo(b) fluoranthene and benzo(a) pyrene increased due to changes in the PAH sources. Source apportionment by positive matrix factorization indicated that the two sources responsible for the highest soil PAH contributions changed from biomass combustion (42%) and coal combustion (32%) in 2009 to coal, biomass and natural gas combustion (35%) and diesel combustion (33%) in 2014. However, the two sources with the highest associated health risks were diesel and gasoline combustion in both years. The incremental lifetime cancer risk for residents exposed to PAHs in the soil via incidental ingestion and dermal contact decreased from 1.75 x 10(-6) to 1.60 x 10(-6). The ban on open burning of straw and the substitution of coal with natural gas offset the PAH health risks due to increased urbanization. (C) 2016 Elsevier B.V. All rights reserved.