Pervasiveness and characteristics of microplastics in surface water and sediment of the Buriganga River, Bangladesh

微塑料 沉积物 环境化学 聚丙烯 地表水 环境科学 聚乙烯 污染 聚氯乙烯 化学 环境工程 地质学 有机化学 生态学 生物 古生物学
作者
Muhammad Saiful Islam,Zahidul Islam,Md. Rashed Hasan
出处
期刊:Chemosphere [Elsevier BV]
卷期号:307: 135945-135945 被引量:12
标识
DOI:10.1016/j.chemosphere.2022.135945
摘要

Microplastics (MPs) are an emerging environmental problem due to their all-around existence and extraordinary stability. A significant number of studies are found in recent literature on the occurrence, distribution, transport, and fate of the MPs in several environmental compartments. In this study, we have investigated the occurrence and characteristics of MPs in the surface water and sediment of the Buriganga river, located beside the mega-city of Dhaka in Bangladesh. In the Buriganga river, the concentration of MPs in the surface water was found from 4.33 ± 0.58 to 43.67 ± 0.58 items L−1, and in the sediment, MPs varied from 17.33 ± 1.53 to 133.67 ± 5.51 items kg−1 of dry sediment. Fragment-type MPs were predominant in the surface water and sediment, which was 72.7% and 85.5% respectively. The most abundant polymer type polypropylene (PP) was found -to be 46% in the surface water and 61% in the sediment sample. The next major category, polyethylene (PE) was found to be 26% and 21%, respectively. Polystyrene (PS), polyvinyl chloride (PVC), polyethylene terephthalate (PET), and polyamide (PA) were other commonly detected polymer types. The MPs were found to be contaminated by Pb, Cd, Cr, Zn, Cu, and Sn from Energy dispersive-X-ray fluorescence (ED-XRF) analysis. Tannery-induced Cr was detected in the highest concentrations in the MPs, which were 20.67 ± 1.66 mg kg−1 (in surface water) and 14.2 ± 1.25 mg kg−1 (in sediment). The pollution load index (PLI) of the MPs contamination in different sampling sites along the Buriganga river was found in the risk level category of I and II. The anthropogenic influence of the city area was reflected in the PLI values, which had an increasing trend from the upstream sampling points (1.00 ± 1.00, 1.00 ± 1.00) to the downstream sites (10.09 ± 1.00, 7.71 ± 3.60).
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