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Characteristics and Molecular Signatures of Microplastic-Derived Dissolved Organic Matter
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A synthesis of 51 studies found that smaller microplastics, higher temperatures, UV aging, and acidic conditions all increase the amount of dissolved organic matter that microplastics leach into water, with this leaching also acidifying aquatic environments. As microplastics accumulate and weather, the chemicals they release into water may pose additional risks beyond the particles themselves.
Microplastic leaching is increasingly recognized as a significant environmental concern, yet the characteristics of microplastic-dissolved organic matter (MP-DOM) remain inadequately understood. This study systematically synthesized data from 51 published studies to quantitatively evaluate the characteristics and controlling factors of MP-DOM release across multiple microplastic types and environmental conditions. The analysis revealed that multiple environmental variables jointly regulate MP-DOM release: smaller particle size, higher temperatures, and UV-induced aging significantly promoted dissolved organic carbon (DOC) leaching, while solution ionic strength and pH also modulated release behavior, and high DOC release was associated. Biodegradable polymers (e.g., PLA, PBAT) and petroleum-based polymers generally exhibited comparable DOC release capacities. Furthermore, high DOC release was linked to aquatic acidification, resulting in significant reductions in pH. The dissolved organic matter was dominated by hydrophilic components and low-aromaticity fractions, with 78.95% of the SUVA254 values being below 3 L/(mg·m). And longer aging times and greater microplastic accumulation favored the release of aromatic and hydrophobic components. Fluorescence characterization demonstrated that microbial byproduct-like substances were predominant, accompanied by humic-like and protein-like fluorophores, indicating both polymer degradation and biofilm activity. A parallel factor analysis applied to data from 20 articles (n = 431) indicated that the dissolved organic matter was composed of 57.54% protein-like substances and 42.46% humic-like substances. Our data analysis offered valuable insights into the behavior and fate of microplastics in ecosystems.
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Microplastic-Derived Dissolved Organic Matter: Release Pattern, Chemical Properties, Environmental Risk, and Impact on Carbon Cycling
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This review examines microplastic-derived dissolved organic matter (MPs-DOM), which plastic debris releases at an estimated 23,600 tons annually into surface waters, covering its chemical properties, release patterns, and interactions with metals, microorganisms, and the carbon cycle. MPs-DOM represents a largely overlooked secondary pollution pathway through which microplastics extend their environmental impact well beyond the particles themselves.
The molecular transformation of microplastic-derived dissolved organic matter regulates the bioavailability of conventional microplastic
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Researchers discovered that dissolved organic matter released from biodegrading polyethylene microplastics (MP-DOM) creates a self-inhibitory feedback loop — as aromatic compounds in MP-DOM are broken down by plastisphere bacteria, key PE-degrading microbes decline, significantly slowing further plastic degradation over time.
Interaction of Microplastics and Organic Pollutants: Quantification, Environmental Fates, and Ecological Consequences
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Microplastics act as vectors for organic pollutants such as pesticides and industrial chemicals, concentrating and transporting these toxins to organisms that ingest the particles, amplifying exposure beyond what either contaminant would cause alone. This combined pollution effect complicates environmental risk assessments and underscores why microplastic contamination is more dangerous than particle counts alone suggest.
Microplastic (MP) Pollution in the Context of Occurrence, Distribution, Composition and Concentration in Surface Waters and Sediments: A Global Overview
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Researchers compiled global data showing microplastic pollution is essentially everywhere — in surface waters and sediments worldwide — with some locations finding microplastics in nearly every sample collected, underscoring how pervasive this contamination has become.
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