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61,005 resultsShowing papers similar to Fate of Microplastics in River Environment: Chemical Composition of Molecular Releasing After Photolysis and Hydrolysis
ClearThe fate of microplastics in the environment: Systematic studies to determine release rates of secondary micro- and nanoplastics and water-soluble organics induced by photolysis and hydrolysis
Researchers conducted systematic studies on the photolytic and hydrolytic degradation of microplastics using three photolysis protocols and multiple polymer types to determine release rates of secondary micro- and nanoplastics and water-soluble organics, providing mechanistic data needed for environmental fate and risk assessment.
The fate of microplastics in the environment: Systematic studies to determine release rates of secondary micro- and nanoplastics and water-soluble organics induced by photolysis and hydrolysis
Researchers conducted systematic studies on the photolytic and hydrolytic degradation of microplastics using three photolysis protocols and multiple polymer types to determine release rates of secondary micro- and nanoplastics and water-soluble organics, providing mechanistic data needed for environmental fate and risk assessment.
Microplastics in river water: occurrence, weathering, and adsorption behaviour
Researchers examined microplastics in river water, characterizing their occurrence, degree of weathering, and capacity to adsorb co-contaminants. The study highlights microplastics as vectors that can transport and re-release other pollutants in freshwater systems.
Molecular fingerprints of dissolved organic matter leached from microplastics over prolonged photochemical aging: Implications for aquatic carbon cycling
Researchers used ultra-high-resolution mass spectrometry to identify the dissolved organic molecules that leach from polypropylene, polyethylene, and polystyrene microplastics after prolonged exposure to sunlight. They found that polystyrene released the most diverse array of molecules, many of which could persist in water systems. The study suggests that as microplastics degrade in sunlight, they release non-natural organic compounds that may affect the aquatic carbon cycle from rivers to oceans.
Molecular-level insights into derivation dynamics of microplastic-derived dissolved organic matter
Researchers used molecular-level analysis to investigate the formation dynamics of dissolved organic matter derived from microplastics (MPs-DOM) in natural surface waters, finding that this ubiquitous contaminant affects not only aquatic organisms but also undergoes complex chemical transformations that influence its environmental fate and toxicological relevance.
Phototransformation and photoreactivity of MPs-DOM in aqueous environment: Key role of MPs structure decoded by optical and molecular signatures
Researchers investigated how dissolved organic matter released from microplastics behaves during light-driven transformation in water. They found that organic matter from benzene-containing polymers showed distinctly different photoreactivity compared to matter from polyolefin-based plastics. The study reveals that the chemical structure of the parent microplastic plays a key role in determining how its dissolved byproducts react and generate reactive species in aquatic environments.
Sizeand Structure-DependentMolecular FingerprintTransformation of Microplastic-Derived Dissolved Organic Matter inSunlit Seawater: Implication for Marine Carbon Cycles
Researchers investigated how the size and structure of microplastics influence the photochemical transformation of microplastic-derived dissolved organic matter in sunlit seawater, finding that inherent polymer properties shape the molecular fingerprint changes with implications for marine carbon cycling.
Sizeand Structure-DependentMolecular FingerprintTransformation of Microplastic-Derived Dissolved Organic Matter inSunlit Seawater: Implication for Marine Carbon Cycles
Researchers investigated how the size and structure of microplastics influence the photochemical transformation of microplastic-derived dissolved organic matter in sunlit seawater, finding that inherent polymer properties shape the molecular fingerprint changes with implications for marine carbon cycling.
Progress on the photo aging mechanism of microplastics and related impact factors in water environment
This review examined the photo-aging mechanisms of microplastics in aquatic environments, finding that solar UV radiation drives oxidation reactions that alter surface chemistry, fragment particles further, and enhance their capacity to adsorb and release co-occurring pollutants.
Molecular-level insights into the heterogeneous variations and dynamic formation mechanism of leached dissolved organic matter during the photoaging of polystyrene microplastics
Researchers investigated the molecular-level changes that occur when polystyrene microplastics break down under light exposure and release dissolved organic matter into water. They found that the released molecules were highly diverse and changed dynamically over the course of aging, with different chemical classes appearing at different stages. The study provides new insight into how degrading microplastics introduce complex mixtures of organic chemicals into aquatic environments.
First evidence of microplastics in a freshwater river and their relationship to water quality
Researchers measured microplastic concentrations in a freshwater river used for recreational purposes and found a significant relationship between microplastic abundance and water physicochemical quality parameters, along with the presence of three organic compounds, providing evidence that microplastic pollution and water quality are closely linked.
Characterization of microplastic-derived dissolved organic matter in freshwater: Effects of light irradiation and polymer types
Researchers examined how different types of microplastics release dissolved organic matter into freshwater under light and dark conditions. They found that polypropylene released the most organic compounds after UV exposure, while protein-like substances were the main material released by most plastics in the dark. The study indicates that microplastics may have ongoing, long-term effects on water chemistry and microbial activity in natural water bodies.
Macroplastic fragmentation in rivers
This review examines how large plastic debris in rivers gradually breaks apart into micro- and nanoplastics through physical abrasion, UV degradation, and biological activity, with river systems acting as long-term reservoirs and transfer pathways for plastic pollution. The authors propose a conceptual framework identifying which properties of the plastic item and which river characteristics control how quickly fragmentation occurs, finding that retention times can range from years to centuries. Understanding these fragmentation rates is essential for predicting how much secondary microplastic pollution ultimately reaches the ocean and enters food chains.
Size and Structure-Dependent Molecular Fingerprint Transformation of Microplastic-Derived Dissolved Organic Matter in Sunlit Seawater: Implication for Marine Carbon Cycles
This study examined how the size and structure of microplastics influence the photochemical transformation of MP-derived dissolved organic matter under UV irradiation, finding that inherent plastic properties determine the molecular character of DOM released and its effects on ocean carbon cycling.
Molecular Signatures of Dissolved Organic Matter Generated from the Photodissolution of Microplastics in Sunlit Seawater
Researchers incubated polyethylene, polypropylene, and expanded polystyrene microplastics in sunlit seawater and characterized the dissolved organic matter produced as the plastics broke down. The study found that sunlight generated hundreds of unique oxygen-containing chemical products from each plastic type, while virtually none were produced in the dark. Evidence indicates that a single process, photodegradation, can transform simple plastic polymers into a complex array of dissolved organic chemicals in ocean environments.
High-Resolution Mass Spectrometry Combined with Reactive Oxygen Species Reveals Differences in Photoreactivity of Dissolved Organic Matter from Microplastic Sources in Aqueous Environments
Researchers analyzed the dissolved organic matter that different types of microplastics release into water and how it reacts with sunlight. Plastics with aromatic structures like polystyrene and PET released compounds that broke down faster and generated more reactive oxygen species than polyethylene or polypropylene. Understanding how different plastics chemically alter water quality is important because these released compounds and reactive species can affect aquatic life and the safety of water sources used by people.