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Propuesta metodológica para la evaluación de la toxicidad de microplásticos en ambientes acuáticos
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Researchers developed a toxicity testing methodology for microplastics using Daphnia magna as a test organism, evaluating particles from compostable, oxodegradable, and polyethylene plastic bags as well as commercial exfoliants. They found that microplastic exposure altered newborn counts, lifespan, and body size of the organisms, and recommended extending evaluation periods and expanding reproductive endpoints in standard protocols.
By their nature, microplastics (MP) possess unique characteristics that distinguish them from other pollutants, which is why the existing protocols for the evaluation of the toxicity of substances in water of adaptations. The objective of this work was to develop a methodology for conducting PM toxicity tests from four sources: plastic bags (compostable, oxodegradable and polyethylene) and commercial exfoliants in Daphnia magna. As a result of the tests, it is realized that the exposure and consumption of PM altered the number of newborns born, the life span of the exposed organisms and their size. In accordance with the results obtained, we suggest that the existing protocols for D. magna, when applied for the evaluation of PM toxicity, could consider lengthening the evaluation time and expanding the reproductive effects.
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