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Seasonal distributions and risk assessment of polychlorinated biphenyls (PCBs) in the surficial sediments from the Turag River, Dhaka, Bangladesh

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Abstract

Polychlorinated biphenyls (PCBs) were determined in sediment samples collected from the Turag River, Dhaka city, Bangladesh. This river provides critical ecological services to agriculture, industry, and transportation. However, it is one of the most polluted rivers surrounding the capital city. This study analyzed six PCB congeners (PCB 10, PCB 28, PCB 52, PCB 138, PCB 153, and PCB 180) by GC-ECD at 9 sampling sites in two different seasons. The total concentrations of PCBs in studied samples varied from 344 to 0.217 ng/g dw and 10.6 to 1.68 ng/g dw in Monsoon-season and Dry-season, respectively. The paramount contributor-congener to the total PCBs was PCB 180, and it was found at all the study sites. The ecological risk assessment indicated a high potential risk in the Monsoon-season (\(E\genfrac{}{}{0pt}{}{i}{r}\)= 277) and low potential risk in the Dry-season (\(E\genfrac{}{}{0pt}{}{i}{r}\)= 25.7). Sediment quality guideline quotients (SQGQs) showed that PCBs in the Monsoon-season would cause “no” or “moderate” biological effects on organisms at every site except site-5 (S5) (high biological effects), while no adverse ecotoxicological effect was observed in the Dry-season. Considering both probable effect level (PEL) and threshold effect level (TEL), the new sediment quality guideline quotient (NSQGQ) showed that in the Dry-season PCB contamination would cause “moderate” biological effects. At the same time, in the Monsoon-season, the findings remained consistent with the findings of SQGQ. This study looked at the PCB contamination scenario in the Turag River sediments for the first time and allowed for a comparison with other rivers worldwide.

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Acknowledgements

The authors convey their deepest appreciation to the Ministry of Science and Technology, Government of the People’s Republic of Bangladesh, and Water Research Center, Jahangirnagar University for finance and support to conduct the study. The authors are grateful to the authority of the Institute of National Analytical Research and Service (INARS), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, Bangladesh, for providing laboratory facilities during this research work. The authors also recognize the assistance from M. M. Rashid, M. R. Karim, and S. F. Sharmin I. Jerin, and H. Mahmud.

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NJC, MS, and MKU designed and planned the study. NJC collected and prepared the samples for analysis. MAA and NJC carried out all lab analyses. NJC prepared the draft manuscript. MS and MMR did the revision and proof reading.

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Correspondence to Mashura Shammi.

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The authors declare no competing interests.

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Chowdhury, N.J., Shammi, M., Rahman, M.M. et al. Seasonal distributions and risk assessment of polychlorinated biphenyls (PCBs) in the surficial sediments from the Turag River, Dhaka, Bangladesh. Environ Sci Pollut Res 29, 45848–45859 (2022). https://doi.org/10.1007/s11356-022-19176-0

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  • DOI: https://doi.org/10.1007/s11356-022-19176-0

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