Polycyclic aromatic hydrocarbons in soils from the Central-Himalaya region: Distribution, sources, and risks to humans and wildlife
Polycyclic aromatic hydrocarbons in soils from the Central-Himalaya region: Distribution, sources, and risks to humans and wildlife
复制标题
喜马拉雅中部地区土壤中的多环芳烃：分布、来源以及对人类和野生动物的风险
DOI：
10.1016/j.scitotenv.2016.03.006
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发表时间：
2016-06-15
影响因子：
9.8
通讯作者：
de Boer, Jacob
中科院分区：
文献类型：
--
作者：
Bi, Xiang;Luo, Wei;de Boer, Jacob
喜马拉雅山脉中部不仅是中国和尼泊尔之间的天然边界，也是南亚气团运输的天然屏障。测定了土壤中多环芳烃（PAHs）的浓度，以确定其分布、积累潜力、来源以及对人类和环境的风险。在TPC和尼泊尔采集的土壤中，Sigma(16)PAHs的平均浓度分别为2.4 × 10(2)和3.3 × 10(2) ng/g干质量（dm）。土壤中低分子量多环芳烃（lw -PAHs）浓度与海拔高度呈显著相关。研究区土壤总有机碳（TOC）与多环芳烃（PAHs）浓度呈弱正相关，表明TOC对PAHs的吸附作用不大。尼泊尔的加德满都和博卡拉以及尼泊尔的尼莫（特别是樟木港）、日喀则和拉萨是土壤中多环芳烃浓度较高的地区。正矩阵分解法确定的多环芳烃的主要来源是机动车排放、煤和生物质燃烧。计算出的苯并[a]芘总当量为0.23-44纳克/克/分，添加剂致癌风险指数为3.8 × 10(-3) - 9.2 × 10(-1)，表明所调查的几乎所有土壤中的多环芳烃通过直接接触对居民造成的额外癌症风险极小，并且通过饮用饮用水没有显著的额外癌症风险。平均风险商值表明，39%的土壤对野生动物和喜马拉雅中部环境具有轻微风险。(C) 2016 Elsevier B.V.版权所有
The Central Himalayas are not only a natural boundary between China and Nepal but also a natural barrier for transport of air masses from South Asia. In this study, 99 samples of surface soil were collected from five regions of Nepal on the southern side of the Central Himalayas, and 65 samples of surface soil were obtained from the northern side on the edge of the Tibetan Plateau, China (TPC). Concentrations of polycyclic aromatic hydrocarbons (PAHs) in soils were measured to determine their distribution, potential for accumulation, and sources, as well as risks to humans and the environment. Mean concentrations of Sigma(16)PAHs were 2.4 x 10(2) and 3.3 x 10(2) ng/g dry mass (dm) in soils collected from the TPC and Nepal, respectively. Significant correlations between concentrations of lower molecular weight PAHs (LMW-PAHs) in soils and altitude were found. Total organic carbon (TOC) in soil was positively but weakly correlated with concentrations of PAHs in the study area, which suggested little role of TOC in adsorption of PAHs. The cities of Kathmandu and Pokhara in Nepal and Nyemo (especially Zhangmu Port), Shigatse, and Lhasa on the TPC, were areas with relatively great concentrations of PAHs in soils. The main sources of PAHs identified by positive matrix factorization were emissions from motor vehicles and combustion of coal and biomass in the Central Himalayas. Calculated total benzo[ a] pyrene potency equivalents of 0.23-44 ng/g dm and index of additive cancer risk of 3.8 x 10(-3) - 9.2 x 10(-1) indicated that PAHs in almost all soils investigated posed de minimis risk of additional cancer to residents via direct contact and had no significant risk of additional cancers through consumption of potable water. Mean risk quotient values indicated that 39% of soils had a slight risk to wildlife and the ambient environment of the Central Himalayas. (C) 2016 Elsevier B.V. All rights reserved.