School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, PR China.
School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, PR China.
Ecotoxicol Environ Saf. 2016 Apr;126:154-162. doi: 10.1016/j.ecoenv.2015.12.037. Epub 2016 Jan 1.
The level, distribution, compositional pattern and possible sources of polycyclic aromatic hydrocarbons (PAHs) in Lanzhou urban soil of Northwest China were investigated in this study. The total level of 22 PAHs ranged from 115 to 12,100 µg kg(-1) and that of 16 priority PAHs from 82.4 to 10,900 µg kg(-1). Seven carcinogenic PAHs generally accounted for 6.18-57.4% of total 22 PAHs. Compared with data from those reported about urban areas, PAH contamination in Lanzhou urban soils was moderate. Among different functional areas, higher level of PAHs was found along roadsides and in the industrial district (p<0.01), while lower levels were detected in the commercial, park and residential districts. The composition of PAHs was characterized by high molecular weight PAHs (≥4 rings), among which fluoranthene, benz[a]anthracene and phenanthrene were the most dominant components. Correlation analysis suggested that low molecular weight PAHs and high molecular weight PAHs originated from different sources and further corroborated that TOC was an important factor in the accumulation of PAHs in soil. Isomer ratios and principal component analysis indicated that PAHs in urban soil derived primarily from emissions resulting from the combustion of biomass, coal and petroleum products. Toxic equivalent concentrations (BaP(eq)) of soil PAHs ranged from 6.12 to 1302 µg BaP(eq) kg(-1), with a mean of 138 µg BaP(eq) kg(-1). The results suggested that human exposure to those soils which polluted by high concentrations of PAHs through direct ingestion or inhalation of suspended soil particles probably poses a significant risk to human health from the carcinogenic effects of PAHs.
本研究调查了中国西北地区兰州市城市土壤中多环芳烃（PAHs）的水平、分布、组成模式和可能来源。22 种 PAHs 的总浓度范围为 115 至 12,100 µg kg(-1)，16 种优先 PAHs 的浓度范围为 82.4 至 10,900 µg kg(-1)。7 种致癌 PAHs 通常占总 22 种 PAHs 的 6.18-57.4%。与城市地区的报道数据相比，兰州市城市土壤中的 PAH 污染处于中等水平。在不同功能区中，道路旁和工业区的 PAHs 水平较高（p<0.01），而商业区、公园和居民区的 PAHs 水平较低。PAHs 的组成以高分子量 PAHs（≥4 环）为主，其中荧蒽、苯并[a]蒽和菲是最主要的成分。相关性分析表明，低分子量 PAHs 和高分子量 PAHs 来自不同的来源，并进一步证实 TOC 是土壤中 PAHs 积累的重要因素。同系物比值和主成分分析表明，城市土壤中的 PAHs 主要来源于生物质、煤和石油产品燃烧产生的排放。土壤 PAHs 的毒性等效浓度（BaP(eq)）范围为 6.12 至 1302 µg BaP(eq) kg(-1)，平均值为 138 µg BaP(eq) kg(-1)。结果表明，人类通过直接摄入或吸入悬浮土壤颗粒接触到受高浓度 PAHs 污染的土壤，可能会对人体健康造成致癌效应的 PAHs 的显著风险。
