Spatiotemporal distribution, source, and ecological risk of polycyclic aromatic hydrocarbons (PAHs) in the urbanized semi-enclosed Jiaozhou Bay, China
Spatiotemporal distribution, source, and ecological risk of polycyclic aromatic hydrocarbons (PAHs) in the urbanized semi-enclosed Jiaozhou Bay, China
复制标题
城市化半封闭胶州湾多环芳烃(PAHs)时空分布、来源及生态风险
DOI：
10.1016/j.scitotenv.2020.137224
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发表时间：
2020-05-15
影响因子：
9.8
通讯作者：
Lu, Shuang
中科院分区：
文献类型：
--
作者：
Cao, Yuanxin;Xin, Ming;Lu, Shuang
沿海多环芳烃(PAHs)污染是一个世界性的问题。然而，中国地区都市化半封闭式海湾中多环芳烃的时空分布特征尚不明确。本文介绍了胶州湾水体和沉积物中15种优先多环芳烃的测定结果，并对其时空分布、来源和生态风险进行了评价。水体中总多环芳烃浓度为23.6~86.2ng·L-1，沉积物中为37.7ngg~(-1)~290.9 ng·g~(-1)。冬季水体中SPAH值(52.8ngL-1)显著高于春季(30.4ngL-1)(α=0.0 5)。水中菲的平均浓度春季为8.9ngL-1，冬季为15.7ngL-1，多环芳烃含量最高，对西格玛多环芳烃的贡献率约为29.4%。与三环多环芳烃相比，四环和五环多环芳烃更倾向于在底泥中积累，其在底泥中的分配受水体盐度的影响。水中西格玛多环芳烃浓度的空间分布受水交换能力的控制。有机质含量和沉积物质地对决定Sigma多环芳烃在沉积物中的空间分布起着重要作用。分子诊断率分析表明，热源是海湾中多环芳烃的主要来源。具体而言，正矩阵分解(PMF)模型表明，机动车排放、生物质燃烧、煤炭燃烧和成岩源对Sigma多环芳烃的贡献率分别为41.6%、20.2%、20%和18.2%。根据沉积物质量指南进行的风险评估表明，预计在沉积物中很少会发生不利的生物影响。(C)2020爱思唯尔B.V.保留所有权利。
Coastal contamination by polycyclic aromatic hydrocarbons (PAHs) is a worldwide issue. Nevertheless, the spatiotemporal distribution of PAHs in the urbanized semi-enclosed bays in China remains relatively uncharacterized. Here we present measurements of 15 priority PAHs in the water and sediment of the Jiaozhou Bay, as well the assessment of their spatiotemporal distribution, sources and ecological risk. The total PAH (SPAH) concentrations ranged from 23.6 to 86.2 ng L-1 in the water and from 37.7 to 290.9 ng g(-1) in the sediment. The average SPAH concentration in the water was significantly higher in the winter (52.8 ng L-1) than in the spring (30.4 ng L-1) (alpha= 0.05 level). Average concentration of phenanthrene in the water was 8.9 ng L-1 in the spring and 15.7 ng L-1 in the winter and the highest of PAHs, contributing about 29.4% to Sigma PAHs. Compared with three-ring PAHs, four- and five-ring PAHs were more tended to accumulate in the sediment, and the partitioning into sediment was influenced by the water salinity. The spatial distribution of Sigma PAH concentrations in the water were controlled by water exchange capability. Organic matter content and sediment texture played important roles in determining the spatial distribution of Sigma PAHs in the sediment. Molecular diagnostic ratio analysis indicated that pyrogenic source was the main source for PAHs in the Bay. Specifically, the positive matrix factorization (PMF) model indicated that vehicle emission, biomass combustion, coal combustion, and petrogenic sources contributed for 41.6, 20.2, 20, and 18.2% of Sigma PAHs, respectively. The risk assessment by sediment quality guidelines suggested that adverse biological effects are expected to occur rarely in the sediment. (c) 2020 Elsevier B.V. All rights reserved.