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Microplastics in aquatic systems: A comprehensive review of its distribution, environmental interactions, and health risks
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This review summarizes how microplastics accumulate in oceans, rivers, and lakes, where they absorb toxic chemicals like heavy metals and persistent organic pollutants and carry them up through the food chain. An estimated 5.25 trillion plastic particles float in global oceans, releasing dissolved carbon that disrupts microbial ecosystems, with ultimate risks to human health through seafood consumption and drinking water.
Microplastics (MPs) have become a critical pollutant, accumulating in aquatic ecosystems and posing significant environmental and human health risks. Approximately 5.25 trillion plastic particles float in global oceans, releasing up to 23,600 metric tonnes of dissolved organic carbon annually, which disrupts microbial dynamics. MPs arise from the breakdown of larger plastics, degraded by photodegradation, thermal degradation, and biological processes, which are influenced by polymer type and environmental factors. As carriers, MPs absorb and transport contaminants such as heavy metals, per- and polyfluoroalkyl substances (PFAS), and persistent organic pollutants (POPs) across trophic levels, thereby increasing toxicity within food webs. Key aquatic organisms, including microalgae, molluscs, and fish, experience cellular toxicity, oxidative stress, and disruptions in essential functions due to MP ingestion or adhesion, raising concerns about their bioaccumulation in humans through ingestion, inhalation, and dermal contact. The complex surface chemistry of MPs enhances their pollutant adsorption, a process modulated by environmental pH, salinity, and contamination levels, while aging and structural attributes further impact their bioavailability and toxicity. This review consolidates knowledge on MPs' occurrence, transformation, pollutant interactions, and methodologies for sampling and analysis, emphasizing advancements in spectroscopy and imaging techniques to improve MP detection in aquatic environments. These insights underscore the pressing need for standardized analytical protocols and comprehensive toxicological research to fully understand MPs' effects on ecosystems and human health, informing future mitigation strategies and policy development.
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Insight into microplastics in the aquatic ecosystem: Properties, sources, threats and mitigation strategies
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This review summarizes how microplastics contaminate aquatic ecosystems through various pathways, where they can absorb other toxic chemicals and become even more harmful. The findings are relevant to human health because microplastics in fish and shellfish from contaminated waters can carry these concentrated pollutants into our diets.
A review of microplastics in the aquatic environmental: distribution, transport, ecotoxicology, and toxicological mechanisms
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This review examines how microplastics are distributed, transported, and accumulate throughout aquatic environments, and the toxicological effects they have on aquatic organisms. The study suggests that microplastics can affect human health through the food chain, but notes that understanding of combined toxicity mechanisms remains very limited. The authors identify significant knowledge gaps and call for more systematic environmental risk assessments across multiple species.
Microplastics in Aquatic Ecosystems: A Critical Review of Sources, Transport Mechanisms and Ecotoxicological Risks
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This review provides a broad overview of microplastic pollution in rivers, oceans, and other aquatic environments, covering where these particles come from, how they move through water systems, and the harm they can cause. Evidence indicates that microplastics accumulate toxins and disrupt growth, feeding, and reproduction in aquatic species, with potential consequences for human health through seafood and drinking water. The authors stress the need for better global monitoring, stronger waste management systems, and development of eco-friendly plastic alternatives.
Microplastics in the environment: A critical overview on its fate, toxicity, implications, management, and bioremediation strategies
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This review provides a broad overview of microplastic pollution, covering how these particles enter freshwater systems, accumulate in organisms, and carry toxic chemicals through the food chain. With approximately 360 million tons of plastic produced globally each year and only 7% recycled, microplastics have become a pervasive threat to water quality and, by extension, human health.
Unraveling the ecotoxicological effects of micro and nano-plastics on aquatic organisms and human health
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This review summarizes the growing body of evidence on how micro- and nanoplastics affect aquatic organisms and, through the food chain, potentially human health. The tiny plastic particles absorb toxic pollutants and pathogens from the water, acting as carriers that deliver these harmful substances into the bodies of fish, shellfish, and other organisms. The review highlights that both direct plastic toxicity and indirect chemical exposure through contaminated seafood pose risks to human consumers.
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