Organic contamination of beached plastic pellets in the South Atlantic: Risk assessments can benefit by considering spatial gradients

Chemosphere
Daniel GormanCésar de Castro Martins

Abstract

Microplastics are important vectors for the transport and accumulation of persistent organic contaminants in coastal and marine environments. We determined the concentration of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) associated with microplastic pellets collected along a 39-km stretch of Brazil's South Atlantic coastline to understand the spatial dynamics and potential risk posed by these contaminants. Total PAH concentrations ranged from 1,454 to 6,002 ng g-1 and regularly exceeded the threshold effect level (TEL) for sediments defined by the United States Environmental Protection Agency. Sampling stations, spaced evenly along the coastline (i.e., 3-km intervals) exhibited a general north-to-south decline in the concentrations of some PAHs, but this spatial gradient was complicated by small-scale differences in the concentrations and composition of associated contaminants. Similarly, analysis of individual isomer ratios revealed further complexity driven by differences in the contribution of petrogenic versus pyrolytic inputs which pose different levels of risk to marine organisms. PCB concentrations ranged from 0.8 to 104.6 ng g-1 and were dominated by low chlorinated congeners likely to h...Continue Reading

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Citations

Feb 26, 2020·International Journal of Environmental Research and Public Health·Masato Honda, Nobuo Suzuki
Jan 9, 2021·Marine Environmental Research·Anderson Targino da Silva FerreiraCarlos Henrique Grohmann
Feb 7, 2021·The Science of the Total Environment·Isabella Ferreira Nascimento MaynardMaria Nogueira Marques
Dec 2, 2020·Environmental Pollution·Flora Rendell-BhattiEva Jimenez-Guri
Apr 12, 2021·The Science of the Total Environment·Franciele O Campos da RochaJailson B de Andrade
Jul 4, 2021·Environmental Research·Adebayo Olatunbosun Sojobi, Tarek Zayed
Dec 1, 2020·Environmental Science & Technology·Lei MaiEddy Y Zeng

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