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Microplastic Pollution in Tropical River: Fourier Transform Infrared Spectroscopy-Based Characterization of Abundance and Polymer Composition in Water and Sediments from Filobobos River, Mexico
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Researchers characterized microplastic pollution in the water and sediments of the Bobos River in the tropical lowlands of Veracruz, Mexico, finding that blue-colored polyethylene fibers were the most common type. The study links the dominant polymer — polyethylene, commonly used in agricultural mulch and chemical containers — to the river basin's agricultural activity. As one of the first microplastic studies in this biodiverse region, it provides baseline data and highlights the need for better plastic waste management in Mexico's river systems.
Veracruz is a megadiverse state facing great water resource management challenges. The contamination of water bodies with external materials of anthropogenic origin stands out, including those derived from plastic products, which are deemed ubiquitous, emerging contaminants that have gained notoriety in recent decades due to the extent and effects of their presence, persistence and distribution in aquatic ecosystems. Being a significant environmental threat, their presence, persistence and distribution in aquatic ecosystems are deserving of a more detailed study. This research focused on analyzing microplastic (MP) retention and characterization in environmental matrixes (water and sediment) in the Bobos River’s lower basin, also taking into account other water physicochemical parameters, including a pH range from slightly acidic (5.17) to slightly alkaline (8.94) as the maximum value and an average temperature of 28.87 °C (83.96 °F). MPs are most frequently found in the form of blue-colored fibers. A polymer analysis by Fourier Transform Infrared Spectroscopy (FTIR) revealed that the most common polymer was polyethylene (PE), which is the main component of most agricultural mulch and agrochemical containers. This research aims to enhance the understanding of the plastic matter contamination of water bodies, pointing out the need for further and deeper research on this subject.
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Researchers systematically studied microplastic pollution in the Feiyun River Basin in eastern China using field sampling and spectroscopic analysis. They found microplastic concentrations ranging from 3.7 to 36.4 items per liter, predominantly small particles and fragments, with polyethylene and polypropylene as the most common polymer types, indicating significant freshwater contamination in this subtropical river system.
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Scientists tested water from Mexico's heavily polluted Atoyac River and found chemical signatures that look like common plastics (such as those used in bottles, packaging, and textiles), along with signs of dye chemicals from textile factories. Importantly, this is a preliminary screening method, not definitive proof of microplastics—researchers still need to confirm these findings with more rigorous testing. Still, it highlights that rivers receiving industrial and household waste may be carrying plastic-related contamination, which matters because these waterways can be sources of drinking water and eventually make their way into the food chain.
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