Department of Disaster Management, Begum Rokeya University, Rangpur 5400, Bangladesh; Department of Development Studies, Daffodil International University, Dhaka 1216, Bangladesh.
Malatya Turgut Özal University, Doğanşehir V.K. Vocational School, Department of Aquaculture, Malatya, Turkey.
Mar Pollut Bull. 2023 May;190:114845. doi: 10.1016/j.marpolbul.2023.114845. Epub 2023 Mar 24.
Metal enrichment in lake sediments originating from multiple sources can threaten both the aquatic ecosystem and human health. Therefore, assessment of the eco-environmental risks and potential sources of metals in the sediments is essential for effective lake management. Here, we analyzed the sediment metal contents of Kaptai Lake, the largest lake in Bangladesh for the first time with this study. The results indicated that only Cr and Ni contents among the metals studied exceeded the probable effect concentrations (PEC) at 25.42 % and 55.93 % of the sampling stations, respectively. All metals at most sampling stations showed low contamination and low ecological risk based on the individual indices (geoaccumulation index, contamination factor, ecological risk factor, enrichment factor and modified hazard quotient). There was no significant risk from the combined metals in the sediments of the lake according to the synergistic indices (toxic risk index, Nemerow risk index, ecological risk index, Nemerow pollution index and pollution load index). Organic matter and silt were significant sediment parameters that favored the accumulation of Cr, Fe, Cu, Pb and Mn. In the absolute principle component scores-multiple linear regression model (APCS-MLR), five potential sources of metals were identified in the sediments: Zn, Mn, Co and Cd mainly from natural sources and to a lesser extent from agricultural and aquacultural activities, Ni, Cr and Fe from parent materials, Pb and Cu mainly from natural sources and to a lesser extent from vehicle emissions, Hg and U from lithogenic sources, and As from natural sources. This study will improve our knowledge of the sedimentary metal contents of Kaptai Lake and provide helpful information for developing effective lake management and pollution control strategies.
多种来源的湖泊沉积物中的金属富集会威胁到水生生态系统和人类健康。因此，评估沉积物中金属的生态环境风险和潜在来源对于有效的湖泊管理至关重要。在这里，我们首次对孟加拉国最大的湖泊卡普塔伊湖（Kaptai Lake）的沉积物中的金属含量进行了分析。结果表明，在所研究的金属中，只有 Cr 和 Ni 的含量分别在 25.42%和 55.93%的采样点超过了可能效应浓度（PEC）。根据单个指数（地积累指数、污染因子、生态风险因子、富集因子和修正危害商），大多数采样点的所有金属都显示出低污染和低生态风险。根据协同指数（毒性风险指数、内梅罗风险指数、生态风险指数、内梅罗污染指数和污染负荷指数），湖泊沉积物中的综合金属没有显著风险。有机质和淤泥是有利于 Cr、Fe、Cu、Pb 和 Mn 积累的重要沉积物参数。在绝对主成分得分-多元线性回归模型（APCS-MLR）中，确定了沉积物中五种潜在金属源：Zn、Mn、Co 和 Cd 主要来自自然源，其次是农业和水产养殖活动；Ni、Cr 和 Fe 来自母岩；Pb 和 Cu 主要来自自然源，其次是汽车排放；Hg 和 U 来自岩源；As 来自自然源。本研究将提高我们对卡普塔伊湖沉积物中金属含量的认识，并为制定有效的湖泊管理和污染控制策略提供有益信息。
