School of Geography, Nanjing Normal University, 1 Wenyuan Road, Qixia, Nanjing, 210023, China.
Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing, 210023, China.
Sci Rep. 2022 Mar 7;12(1):3668. doi: 10.1038/s41598-022-07507-7.
To study the spatial occurrence, sources, and ecological risks of 16 PAHs, surface sediments had been collected from seven major areas of Taihu Lake, China in April 2021. Results showed that the concentrations of ∑PAHs varied between 1381.48 and 4682.16 ng g, and the contents of BghiP in each sample were the highest. The PAHs concentrations in the sediments near the lakeshore were much higher than those in the central area of the lake. The sedimentary ∑PAHs were mainly composed of molecular-weight monomers and 4-ring PAHs showed superiority (35.69-45.02%). According to the ratio of PAH monomer, the sedimentary PAHs in Taihu Lake were dominantly derived from the combustion. Through the biological toxicity assessment and the BaP equivalent (BaPE), great biological risks of PAHs monomers i.e. DahA and IcdP were found. Both concentrations of ∑PAHs and dominant 4-6-ring monomers accompanied by carcinogenic risks in many areas of Taihu Lake increased. It is necessary to strengthen monitoring and take measures to control the input of organic pollutants.
为研究 16 种多环芳烃（PAHs）在太湖的空间分布、来源及生态风险，本研究于 2021 年 4 月采集了太湖 7 个主要湖区的表层沉积物。结果表明，∑PAHs 浓度范围为 1381.48-4682.16ng/g，各样本中 BghiP 的含量最高。湖滨区沉积物中的 PAHs 浓度明显高于湖区中心。∑PAHs 主要由低分子量单体组成，且四环 PAHs 占主导地位（35.69-45.02%）。根据单体比值，太湖沉积物中的 PAHs 主要来源于燃烧源。通过生物毒性评估和 BaP 当量（BaPE），发现多环芳烃单体 DahA 和 IcdP 具有较大的生物毒性风险。太湖许多地区的∑PAHs 浓度和优势的 4-6 环单体均伴随着致癌风险的增加。因此，有必要加强监测并采取措施控制有机污染物的输入。
