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Distribution of heavy metals in water and sediment of an urban river in a developing country:A probabilistic risk assessment

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International Journal of Sediment Research 2022年第2期37卷 173-187页

作者： Mir Mohammad Ali Saima Rahman Md Saiful Islam Md Refat Jahan Rakib Shaharior Hossen Md Zillur Rahman tapos kormoker Abubakr M. Idris Khamphe Phoungthong Environmental Assessment and Technology for Hazardous Waste Management Research Center Faculty of Environmental Management Prince of Songkla University Quality Control Chemistry Lab Department of Fisheries Department of Aquaculture Sher-e-Bangla Agricultural University Research Center for Advanced Materials Science (RCAMS) King Khalid University Institute of Disaster Management Khulna University of Engineering and Technology Department of Soil Science Patuakhali Science and Technology University Department of Emergency Management Patuakhali Science and Technology University Department of Urban and Regional Planning Khulna University of Engineering and Technology Department of Fisheries and Marine Science Noakhali Science and Technology University Department of Fisheries Science Chonnam National University Department of Chemistry College of Science King Khalid University

River water and sediment embody environmental characteristics that give valuable eco-environmental information.Due to rapid industrialization,the aquatic environment of any urban river can be seriously polluted by heavy metals(HMs).The global concern is caused by heavy metal pollution because of its potential harm to aquatic ecosystems and human health.In the Bhairab River,Bangladesh,surface sediment concentrations of globally alarming toxic metals such as arsenic(As),chromium(Cr),cadmium(Cd),and lead(Pb) were measured to determine the ecological and human health risks of the riverine ecosystem.The average As,Cr,Cd,and Pb concentrations in water were 3.55,31.74,1.44,and23.82 μg/L,respectively,and in sediment were 4.13,34.17,1.66,and 25.46 mg/kg,respectively.During the winter,metals in sediment were higher than during the summer.For most sediment samples,the enrichment factor(EF),contamination factor(CF),geoaccumulation index(I),pollution load index(PLI) of As,Cr,Cd,and Pb indicated moderate contamination.The potential ecological risk(PER) in sediment followed the descending order of Cd> As> Pb> Cr.The contamination level of toxic metals implied that the condition is frightening and probably severely affecting the aquatic ecology of this riverine ecosystem.

关键词： Toxic metals Environmental risk Bioaccumulation Ecological risk Bangladesh

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