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Microplastics in ecosystems: Critical review of occurrence, distribution, toxicity, fate, transport, and advances in experimental and computational studies in surface and subsurface water
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This review provides a broad overview of microplastic contamination across freshwater, marine, and land environments, finding concentrations ranging from negligible to hundreds of thousands of particles per kilogram of sediment. The most common types are polypropylene, polystyrene, polyethylene, and PET, spread by wastewater discharge, stormwater runoff, and poor waste management. The wide variability in contamination levels makes it difficult to assess overall risk to ecosystems and human health.
Microplastics (MPs), particles under 5 mm, pervade water, soil, sediment, and air due to increased plastic production and improper disposal, posing global environmental and health risks. Examining their distribution, quantities, fate, and transport is crucial for effective management. Several studies have explored MPs' sources, distribution, transport, and biological impacts, primarily focusing on the marine environment. However, there is a need for a comprehensive review of all environmental systems together for enhanced pollution control. This review critically examines the occurrence, distribution, fate, and transport of MPs in the following environments: freshwater, marine, and terrestrial ecosystems. The concentration of MPs is highly variable in the environment, ranging from negligible to significant amounts (0.003-519.223 items/liter in water and 0-18,000 items/kg dry weight sediment, respectively). Predominantly, these MPs manifest as fibers and fragments, with primary polymer types including polypropylene, polystyrene, polyethylene, and polyethylene terephthalate. A complex interplay of natural and anthropogenic actions, including wastewater treatment plant discharges, precipitation, stormwater runoff, inadequate plastic waste management, and biosolid applications, influences MPs' presence and distribution. Our critical synthesis of existing literature underscores the significance of factors such as wind, water flow rates, settling velocities, wave characteristics, plastic morphology, density, and size in determining MPs' transport dynamics in surface and subsurface waters. Furthermore, this review identifies research gaps, both in experimental and simulation, and outlines pivotal avenues for future exploration in the realm of MPs.
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This review summarizes research on microplastic pollution across freshwater and marine ecosystems on all six continents, finding that polyethylene and polypropylene are the most common types found in water. The study highlights that microplastics serve as carriers for toxic chemicals and can move up the food chain, ultimately posing risks to human health through seafood consumption and drinking water.
Microplastic in water and wastewater: occurrence, toxicity, analytical approach, and remediation
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This comprehensive review analyzed microplastic occurrence and toxicity in water and wastewater across studies from all continents, finding polyethylene and polypropylene as the most common polymer types and reviewing detection, quantification, and remediation methods.
Microplastics in aquatic systems: A review of occurrence, monitoring and potential environmental risks
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Researchers review the presence of microplastics — tiny plastic fragments less than 5 mm — across freshwater and marine environments worldwide, finding that polyethylene, polypropylene, and polystyrene are the most commonly detected types. Exposure disrupts feeding, movement, and reproduction in aquatic wildlife, and the authors call for standardized measurement methods and legal limits to protect ecosystems.
Microplastic Pollution in the Environment
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This review examines the ubiquitous presence of microplastics as emerging environmental pollutants across all major environmental compartments, synthesizing data on their sources, fates, and concentrations over time and space to characterize the scale of global contamination.
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This review provides a comprehensive overview of microplastic pollution across oceans, freshwater, soil, and the atmosphere, examining their sources, movement patterns, and ecological risks. Researchers found that while coastal environments have been well studied, much less is known about microplastic contamination in terrestrial ecosystems. The study synthesizes data on microplastic toxicity, bioaccumulation in organisms, and environmental fate to support better risk assessment.
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