Li Dianpeng, Yang Tangwu, Zhou Rixiu, Zhu Zhengjie, An Shuqing
School of Life Sciences, Nanjing University, Nanjing 210046, Jiangsu, China.
School of Life Sciences, Nanjing University, Nanjing 210046, Jiangsu, China; Nanjing University Ecological Research Institute of Changshu, Suzhou 215500, Jiangsu, China.
Mar Pollut Bull. 2023 Apr;189:114636. doi: 10.1016/j.marpolbul.2023.114636. Epub 2023 Feb 22.
An integrated assessment of heavy metal (HM) contamination in dissolved matter, suspended particular matter (SPM) and sediments in lakes is essential. This study assessed the risks of HMs in the water, SPM and sediment of Caohai, China, and analyzed the changes in sediment HM contamination in conjunction with historical data. The HM transport was dominated by the SPM load, and the concentrations of Zn (179.07-1821.24 mg kg), Pb (53.63-181.46 mg kg), and Cd (3.68-21.31 mg kg) in SPM and sediment were 5.34-149.11 times higher than the upper continental crust (UCC) values. SPM and sediments were lightly to extremely polluted and had moderate to very high toxicity risks with Cd, Pb and Zn, and these three HMs originated from industrial and agricultural sources. The concentrations of Zn, Pb, and Cd in Caohai sediments increased by 36.7-187.9 % in 2022 compared to pre-2020. This research provides valuable reference data for the remediation of polluted karst lakes.
对湖泊中溶解物质、悬浮颗粒物（SPM）和沉积物中的重金属（HM）污染进行综合评估至关重要。本研究评估了中国草海水中、SPM和沉积物中重金属的风险，并结合历史数据分析了沉积物中重金属污染的变化。重金属的迁移以SPM负荷为主，SPM和沉积物中锌（179.07 - 1821.24 mg kg）、铅（53.63 - 181.46 mg kg）和镉（3.68 - 21.31 mg kg）的浓度比上地壳（UCC）值高5.34 - 149.11倍。SPM和沉积物受到轻度至重度污染，镉、铅和锌具有中度至非常高的毒性风险，这三种重金属源自工农业来源。与2020年之前相比，2022年草海沉积物中锌、铅和镉的浓度增加了36.7 - 187.9 %。本研究为污染岩溶湖泊的修复提供了有价值的参考数据。
