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Occurrence, distribution and possible sources of polychlorinated biphenyls (PCBs) in the surface water from the Bay of Bengal coast of Bangladesh

Publication Date - 2019-01-05 00:00:00

Publication Title : Occurrence, distribution and possible sources of polychlorinated biphenyls (PCBs) in the surface water from the Bay of Bengal coast of Bangladesh

Publicationed By : Dr. Md Saiful Islam

Publication Publication Date : 2019-01-05 00:00:00

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Publication Description :

GC-MS/MS to explore the status of contamination, spatiotemporal distribution and to trace their potential  sources. The total concentrations of dissolved PCBs (ΣPCBs, sum of all congeners) varied from 32.17 to 160.7 ng/  L and 46.45–199.4 ng/L in winter and summer, respectively, and the ranges were comparable to or higher than  those recorded in the surface water from the coastal areas of India, China, Japan, Italy, Belgium and USA. The  difference in the levels of PCBs between the two seasons was not statistically significant (p > 0.05). However,  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).  Lightly to moderately chlorinated (2–6 Cl) homologs dominated the PCB profiles. Our analyses (congener profile  and homolog composition) elucidated that the past and on-going use of PCB-containing equipment (e.g. capacitors  and transformers) as well as the anthropogenic activities such as urban developments, commercial and  industrial establishments (e.g. ship breaking and port activities) might be the potential sources of PCB emission  in Bangladesh. 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 regarding reasonable limitations on full congener assessment. According to the existing national and  international water quality guidelines/standards, PCB concentrations recorded in this study could potentially  cause biological damage. Essentially, the findings of this first comprehensive report on the PCB contamination in  the surface water in Bangladesh may provide a reference to future studies of these compounds in the Bay of  Bengal.

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