Cui Mengke, Xu Shiliang, Song Wenqing, Ye Huibin, Huang Jialiang, Liu Binhan, Dong Bin, Xu Zuxin
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai, 200092, PR China.
Environ Pollut. 2022 Feb 1;294:118614. doi: 10.1016/j.envpol.2021.118614. Epub 2021 Dec 1.
The urban inland river ecosystems are now facing comprehensive pollution and governance pressures. Up to now, few works related to the multiple pollution assessment of trace metals, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) for the urban inland river sediments have been reported in China. Our study investigated the spatial distribution, ecological risk and potential sources of trace metals, PAHs and PCBs in surface sediment collected from 20 sampling sites of Sanya River, Hainan Province, China. The pollution status and potential ecological risk of trace metals were evaluated using the contamination indexes including geoaccumulation index (I), individual potential ecological risk (E), potential ecological risk index (RI) and pollution load index (PLI). Considering the carcinogenicity and toxicity of PAHs and PCBs to human health and the ecological environment, we also analyzed the distributions, sources and adverse biological effects of PAHs and PCBs according to the sediment quality guidelines (SQGs), principal component analysis (PCA) and other source analysis. This study revealed that the surface sediments in Sanya River were extremely slight pollution and showed a very low ecological risk according to I, E, PLI and RI results for trace metals. Besides, PAHs and PCBs pollution detected may not pose considerable adverse biological effect to ecological environment in a foreseeable period on the basis of comprehensive research results. The overall surface sediments quality of the Sanya River not seem to pose a serious pollution and ecological risk based on the evaluation results of multiple pollution factors. The study provided detailed information on the multiple pollution status and location of surface sediments, one of the key environmental indicators of international tourism cities, in the Sanya River, which would be useful for the water quality improvement of Sanya River and the environmental remediation of the other coastal ecosystems from different regions.
城市内河生态系统目前正面临着全面的污染和治理压力。截至目前，中国关于城市内河沉积物中痕量金属、多环芳烃（PAHs）和多氯联苯（PCBs）的多重污染评估的相关研究较少。我们的研究调查了中国海南省三亚河20个采样点表层沉积物中痕量金属、PAHs和PCBs的空间分布、生态风险及潜在来源。采用地累积指数（I）、单项潜在生态风险（E）、潜在生态风险指数（RI）和污染负荷指数（PLI）等污染指数对痕量金属的污染状况和潜在生态风险进行了评估。考虑到PAHs和PCBs对人类健康和生态环境的致癌性和毒性，我们还根据沉积物质量基准（SQGs）、主成分分析（PCA）和其他源分析方法，分析了PAHs和PCBs的分布、来源及不利生物学效应。本研究表明，根据痕量金属的I、E、PLI和RI结果，三亚河表层沉积物污染程度极轻微，生态风险极低。此外，综合研究结果表明，检测到的PAHs和PCBs污染在可预见的时期内可能不会对生态环境造成重大不利生物学影响。基于多种污染因素的评估结果，三亚河表层沉积物总体质量似乎未构成严重污染和生态风险。该研究提供了三亚河这一国际旅游城市关键环境指标之一的表层沉积物多重污染状况和位置的详细信息，这将有助于三亚河水质改善及其他不同地区沿海生态系统的环境修复。
