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Microplastics in the sediments of the Tijuana River Basin, Mexico

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Abstract

The current study evaluates the abundance and characteristics (shape, color and chemical composition) of microplastics (MPs) of the Tijuana River Basin, a binational river system shared by Mexico and the USA and located in the northwest corner of Mexico. The investigation was conducted on microplastics in the riverbed and river shoreline of 11 sites along the main tributaries of the Tijuana River. The median abundance of riverbed and river shoreline sediments was 118 and 183 MPs kg−1, respectively. The dominant shape found was fiber (65%) followed by fragments (19%) and films (10%); the predominant identified polymers were PP polypropylene (46%), PE polyethylene (34.3%) and PS polystyrene (11.4), with lower numbers of polyacrylic, polyamide (PA) and polyethylene terephthalate (PET). Eleven colors were recorded, the most abundant being black (43.7%) and transparent (22.6%). Wastewater treatment plant (WWTP) discharges, littering and inappropriate or insufficient solid waste management are the main sources of MPs. The results highlighted the widespread distribution of MPs in the Tijuana River Basin sediment.

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Acknowledgements

Consejo Nacional de CIencia y Tecnología (CONACYT) is gratefully acknowledged for the Ph.D. scholarship to TDJ Piñon-Colin Colin (scholarship No. 691128). The authors also thank to Universidad Autonoma de Baja for the support in this project. This paper was part of the Ph.D. studies by TDJ Piñon-Colin at the MYDCI doctoral program at Universidad Autónoma de Baja California.

Funding

Consejo Nacional de CIencia y Tecnología (CONACYT) for the PhD scholarship to TDJ Piñon-Colin Colin (scholarship No. 691128).

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TJP-C involved in conceptualization, methodology, writing—original draft. FTW took part in conceptualization, methodology, writing—review and editing, supervision. ER-H participated in validation, writing—review and editing, methodology. ATW-K involved in conceptualization, writing—review and editing. EG-F took part in writing—review and editing; HM involved in writing—review and editing, methodology.

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Correspondence to F. T. Wakida.

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The authors have no relevant financial or non-financial interests to disclose.

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Editorial responsibility: Rangabhashiyam S.

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J Piñon-Colin, T., Wakida, F.T., Rogel-Hernandez, E. et al. Microplastics in the sediments of the Tijuana River Basin, Mexico. Int. J. Environ. Sci. Technol. (2024). https://doi.org/10.1007/s13762-024-05609-5

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  • DOI: https://doi.org/10.1007/s13762-024-05609-5

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