Polycyclic aromatic hydrocarbons in surface sediments of the western Bay of Bengal: Distribution, sources, and ecological risk assessment.

Autor: Furtado CM; CSIR - National Institute of Oceanography, Regional Centre, Kochi 682 018, India; Cochin University of Science and Technology, Kerala, India., Gireeshkumar TR; CSIR - National Institute of Oceanography, Regional Centre, Kochi 682 018, India. Electronic address: gkumar@nio.org., Vignesh ER; CSIR - National Institute of Oceanography, Regional Centre, Kochi 682 018, India; Cochin University of Science and Technology, Kerala, India., Fahad Fathin KP; CSIR - National Institute of Oceanography, Regional Centre, Kochi 682 018, India., Suresh A; Cochin University of Science and Technology, Kerala, India., Jyothibabu R; CSIR - National Institute of Oceanography, Regional Centre, Kochi 682 018, India.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2024 Dec 03; Vol. 211, pp. 117387. Date of Electronic Publication: 2024 Dec 03.
DOI: 10.1016/j.marpolbul.2024.117387
Abstrakt: This study investigated the distribution, sources, and ecological risk of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of the Western Bay of Bengal (WBoB). Coastal, shelf and slope sediments from the WBoB, collected from different research cruises, were analysed for 16 priority PAH pollutants. Total PAHs (TPAHs) were in the range of 1.87-918.79 ng/g and exhibited a significant association with organic matter and silt content with a predominance of high molecular weight (HMW) PAHs congeners. The preferential degradation of the labile low-molecular-weight (LMW) PAHs resulted in the sedimentary accumulation of HMW congeners. A comparison with reported values from other oceanic areas revealed a relatively low concentration of PAHs in WBoB. The isomeric ratios of PAHs could suggest a pyrogenic or petrogenic (crude oil) origin of PAHs. Principal component analysis indicated the dominance of HMW PAHs (petrogenic or combustion) over the LMW fraction. Based on sediment quality guidelines, four congeners [Pyrene (Py), Benzo[a]anthracene (BaA), Chrysene (Ch), and Dibenzo[a,h]anthracene (DbA)] exceeded the threshold effect levels, indicating an adverse impact of these PAHs on the benthic fauna occasionally. The corresponding risk quotients further indicated a moderate risk caused by Py, BaA, and Benzo[b]fluoranthene (BbF) to the biota. This study underscores the importance of proactive management and mitigation strategies to safeguard these vital oceanic ecosystems from the adverse effects of PAHs and other hazardous materials.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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