Li Jing, Li Fadong
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
Mar Pollut Bull. 2017 Mar 15;116(1-2):479-487. doi: 10.1016/j.marpolbul.2016.11.043. Epub 2016 Dec 27.
This paper presents a systematic but preliminary study on the levels, sources and risk of exposure to polycyclic aromatic hydrocarbons (PAHs) in the Yellow River estuary by examining 16 priority PAHs listed by the U.S. EPA in four main environmental media (soil, surface water, groundwater and sediment). The concentration of individual PAHs in each medium in the study area was compared with the reported PAH values in China and abroad and to related environmental quality standards. The pollution levels of PAHs were found to be moderate in the soil and sediment, and low in the surface water and groundwater. Wood, coal combustion and petroleum inputs are the main PAH sources in soil and sediment, while petroleum inputs and petroleum combustion are the main PAH sources in surface water and groundwater. This indicates that PAH input caused by the high-speed inflow of external water over a long time has made a definite contribution to the occurrence of PAHs in surface water and groundwater in the study area. Furthermore, the mean value of the sum of the Excess Lifetime Cancer Risk (∑ELCR) exposure to PAHs in all media exceeded the generally acceptable risk level of 1.0E-06 recommended by the USEPA for carcinogenic chemicals, and the relative proportion contributed by DBA to the ∑ELCR was the greatest.
本文通过检测美国环保署列出的16种优先多环芳烃（PAHs）在黄河口四种主要环境介质（土壤、地表水、地下水和沉积物）中的含量水平、来源及暴露风险，开展了一项系统但初步的研究。将研究区域内各介质中单一PAHs的浓度与国内外报道的PAH值以及相关环境质量标准进行了比较。结果发现，土壤和沉积物中PAHs的污染水平为中等，地表水和地下水中的污染水平较低。木材、煤炭燃烧以及石油输入是土壤和沉积物中PAHs的主要来源，而石油输入和石油燃烧则是地表水和地下水中PAHs的主要来源。这表明，长时间外部水的高速流入所导致的PAH输入，对研究区域地表水和地下水中PAHs的出现起到了一定作用。此外，所有介质中PAHs的终生超额癌症风险（∑ELCR）暴露量的平均值超过了美国环保署针对致癌化学物质建议的普遍可接受风险水平1.0E-06，且二苯并[a,h]蒽对∑ELCR的相对贡献比例最大。
