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引用本文:温佳乐,李岩,李晔,张焕朝,程新宇,李柠,尤心意,朱青,刘敏.太湖表层沉积物多环芳烃的空间分布、来源及其风险.湖泊科学,2024,36(4):1082-1095. DOI:10.18307/2024.0422
Wen Jiale,Li Yan,Li Ye,Zhang Huanchao,Cheng Xinyu,Li Ning,You Xinyi,Zhu Qing,Liu Min.The spatial distribution, source and risk of polycyclic aromatic hydrocarbon in surface sediments of Lake Taihu. J. Lake Sci.2024,36(4):1082-1095. DOI:10.18307/2024.0422
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太湖表层沉积物多环芳烃的空间分布、来源及其风险
温佳乐1,2, 李岩1,3,2,4, 李晔2, 张焕朝1, 程新宇1,2, 李柠1, 尤心意1, 朱青3, 刘敏2
1.南京林业大学林草学院、水保学院, 南方现代林业协同创新中心, 南京 210037;2.华东师范大学地理科学学院, 上海 200062;3.中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210037;4.浙江师范大学流域地表过程与生态安全重点实验室, 金华 321004
摘要:
随着太湖流域社会与经济的发展,多环芳烃(PAHs)在各种环境介质中逐渐累积,污染日益严重,可能对太湖生态环境及周边人体健康构成威胁。为探究太湖沉积物PAHs的来源及生态风险,于2021年12月在太湖采集30个表层沉积物样品,利用气相色谱-质谱联用仪(GC-MS)检测样品中16种PAHs含量;利用受体模型和苯并[a]芘(BaP)毒性当量法进行来源解析及生态风险评估,并将各来源贡献与毒性当量浓度相结合,量化源风险。结果表明,太湖表层沉积物中16种PAHs总含量介于124~592 ng/g之间,平均值为294 ng/g,中值为279 ng/g;高环多环芳烃(HMW PAHs)为主要组分,占∑PAHs的67%。高含量区域位于竺山湾、梅梁湾、贡湖湾和西太湖,与国内外其他湖泊沉积物相比,太湖沉积物PAHs含量处于较低水平。源解析的结果表明,太湖表层沉积物中PAHs交通排放源贡献率为29.1%、煤炭燃烧源贡献率为26.7%、生物质燃烧源贡献率为28.7%、石油源贡献率为15.6%。生态风险评价结果表明,交通排放源、生物质燃烧源、煤炭燃烧源和石油源的BaP毒性当量含量(TEQBaP)均值分别为19.34、17.81、16.33和9.1 ng/g,均小于70 ng/g,几乎处于无风险水平。西太湖、贡湖湾和梅梁湾的部分区域ΣTEQBaP大于70 ng/g属于潜在风险区,具有一定潜在毒性。在后续的污染治理中应重点关注太湖西北部地区污染物的排放。本研究可为沉积物中PAHs污染的研究提供数据支撑,为地方政府精准、高效地管控PAHs污染提供理论依据。
关键词:  太湖  多环芳烃  沉积物  风险评价  来源解析
DOI:10.18307/2024.0422
分类号:
基金项目:国家自然科学基金项目(42101079)、湖泊与环境国家重点实验室开放基金项目(2022SKL002)和浙江师范大学流域地表过程与生态安全重点实验室开放课题(KF-2022-01)联合资助。
The spatial distribution, source and risk of polycyclic aromatic hydrocarbon in surface sediments of Lake Taihu
Wen Jiale1,2, Li Yan1,3,2,4, Li Ye2, Zhang Huanchao1, Cheng Xinyu1,2, Li Ning1, You Xinyi1, Zhu Qing3, Liu Min2
1.College of Forestry and Grass, College of Water Conservation, Nanjing Forestry University, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing 210037, P. R. China;2.:Faculty of Geographical Sciences, East China Normal University, Shanghai 200062, P. R. China;3.State Key Laboratory of Lakes and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210037, P. R. China;4.:Key Laboratory of Watershed Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua 321004, P. R. China
Abstract:
With the social and economic development of Lake Taihu Basin, polycyclic aromatic hydrocarbons (PAHs) have gradually accumulated in various environmental media, increasing severe pollution and posing severe threat to the ecological environment of Lake Taihu and the surrounding human health. To explore the source and ecological risk of PAHs in Lake Taihu sediments, 30 surface sediment samples were collected in Lake Taihu in the winter of 2021. The contents of 16 PAHs were detected by gas chromatography-mass spectrometry (GC-MS). The source analysis and ecological risk assessment were carried out using the receptor model and the benzo[a]pyrene (BaP) toxicity equivalent method. The contribution of each source was combined with the toxicity equivalent concentration to quantify the source risk. The results showed that the total content of 16 PAHs in the surface sediments of Lake Taihu had a range from 124-592 ng/g, with an average value of 294 ng/g and a median value of 279 ng/g. High molecular weight polycyclic aromatic hydrocarbons (HMW PAHs) were the main components, accounting for 67% of PAHs. The high concentration areas were Zhushan Bay, Meiliang Bay, Gonghu Bay and West Lake Taihu. The PAHs content of Lake Taihu sediments was low compared with other lake sediments in previous publications. The results of source analysis showed that PAHs in the surface sediment of Lake Taihu were mainly from traffic emissions (29.1%), coal combustion (26.7%), biomass combustion (28.7%), and petroleum (15.6%). The results of ecological risk assessment showed that the mean toxic equivalent concentrations (TEQBaP) of benzo[a]pyrene were 19.34 ng/g, 17.81 ng/g, 16.33 ng/g and 9.1 ng/g, respectively, which were less than 70ng/g (almost risk-free). Some areas of West Lake Taihu, Gonghu Bay and Meiliang Bay had a ΣTEQBaP greater than 70 ng/g, and had potential risk and toxicity. For pollution control in future, we should focus on pollutant loading into the northwest of Lake Taihu. This study can provide data support for studying PAHs pollution in sediments, and provide a theoretical basis for local governments to control PAHs pollution accurately and efficiently.
Key words:  Lake Taihu  polycyclic aromatic hydrocarbons  sediments  risk assessment  source apportionment
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