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Marine Organic MicropollutantsCongener Profiles of Polychlorinated Biphenyls (PCBs) in Sediment Cores from Sundarban Wetland

Marine Organic Micropollutants: Congener Profiles of Polychlorinated Biphenyls (PCBs) in Sediment... [The chapter presents a detailed account of congener profiles of polychlorinated biphenyls (PCBs) in sediment core samples (<63 μm particle size) covering seven sites in Sundarban mangrove wetland, north-eastern part of the Bay of Bengal. Results pointed out a non-homogenous contamination of the wetland with Σ23PCB values ranging from 0.5 to 26.9 ng g−1 dry weight, reflecting very low to moderate contamination closely in conformity to other Asian coastal regions. The general decreasing order of the dominant congeners to the total load was in the following descending order: CB138 > 153 > 149 > 101, indicating the predominance of hexachlorinated congeners. The spatial distribution revealed significant differences in concentration related to local urbanization with industrial and land-based sources. No uniform temporal trend on PCB levels was recorded probably due to particular hydrological and geomorphological characteristics of the wetland and/or non-homogenous inputs from point sources. Strong positive correlations between the seven dominant congeners suggest their common sources and similar environmental behaviors. These results were also used for a risk assessment evaluation in the Sundarban wetland, showing that the present PCB levels were exceeding in few cases the lower limit of sediment quality guidelines of Environmental Protection Agency and Canadian Council of Ministers of the Environment.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Marine Organic MicropollutantsCongener Profiles of Polychlorinated Biphenyls (PCBs) in Sediment Cores from Sundarban Wetland

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Publisher
Springer International Publishing
Copyright
© Springer International Publishing Switzerland 2016
ISBN
978-3-319-43300-4
Pages
31 –48
DOI
10.1007/978-3-319-43301-1_3
Publisher site
See Chapter on Publisher Site

Abstract

[The chapter presents a detailed account of congener profiles of polychlorinated biphenyls (PCBs) in sediment core samples (<63 μm particle size) covering seven sites in Sundarban mangrove wetland, north-eastern part of the Bay of Bengal. Results pointed out a non-homogenous contamination of the wetland with Σ23PCB values ranging from 0.5 to 26.9 ng g−1 dry weight, reflecting very low to moderate contamination closely in conformity to other Asian coastal regions. The general decreasing order of the dominant congeners to the total load was in the following descending order: CB138 > 153 > 149 > 101, indicating the predominance of hexachlorinated congeners. The spatial distribution revealed significant differences in concentration related to local urbanization with industrial and land-based sources. No uniform temporal trend on PCB levels was recorded probably due to particular hydrological and geomorphological characteristics of the wetland and/or non-homogenous inputs from point sources. Strong positive correlations between the seven dominant congeners suggest their common sources and similar environmental behaviors. These results were also used for a risk assessment evaluation in the Sundarban wetland, showing that the present PCB levels were exceeding in few cases the lower limit of sediment quality guidelines of Environmental Protection Agency and Canadian Council of Ministers of the Environment.]

Published: Sep 15, 2016

Keywords: Sediments; Organochlorine compounds; Polychlorinated biphenyls; Sediment quality guidelines; River Ganges; Estuary

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