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Seasonal-spatial distributions, congener profile, and risk assessment of polychlorinated biphenyls (PCBS)

Publication Date - 2018-09-20 00:00:00

Publication Title : Seasonal-spatial distributions, congener profile, and risk assessment of polychlorinated biphenyls (PCBS)

Publicationed By : Dr. Md Saiful Islam

Publication Publication Date : 2018-09-20 00:00:00

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Publication Description :

A comprehensive congener specific assessment of polychlorinated  biphenyls (PCBs) was conducted for the first time in Bangladesh. All  209 PCB congeners in the surficial coastal sediments from the coastal  areas of Bangladesh were analyzed by GC-MS/MS. The total concentrations  of PCBs (ΣPCBs) varied from 5.27 to 92.21 and 4.61 to  105.3 ng/g dw in winter and summer, respectively, and the ranges  were comparable to or higher than those recorded in the sediments  from the coastal areas of India, Korea, China, and Taiwan. The seasonal  difference in the levels of PCBs was not statistically significant  (p > 0.05). The spatial distribution revealed that the areas with recent  urbanization and industrialization (Chittagong, Cox’s Bazar and  Sundarbans) were more contaminated with PCBs than the unindustrialized  area (Meghna Estuary). Moderately chlorinated (4–6 Cl)  homologs dominated PCB profiles. A set of congeners based on  their detection frequencies and abundance were identified and categorized  as potential environmental marker PCBs, which can be used  for the future selective monitoring studies where there would be  limitations on whole congener assessment. Ecotoxicologically, the  sedimentary PCB concentrations exceeded some of the existing  environmental quality standards, suggesting a potential threat to  the aquatic organisms in the Bangladeshi coastal areas.



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