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Microplastics as a source of phthalate esters in water: A review on occurrence, release mechanism, and ecological risk assessment
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This review pulls together existing research showing that microplastics floating in rivers and lakes aren't just plastic particles, they're also slowly leaking out chemical additives called phthalates, which are known to disrupt hormones. Even worse, as plastics break down over time from sun and physical wear, they release these chemicals faster and can also carry along other pollutants like heavy metals, potentially making the combined exposure more harmful to fish and other aquatic life that ingest them. While this study focused on water ecosystems rather than direct human health effects, it matters because these contaminated waters and organisms are part of the food chain and water supply humans rely
Microplastics (MPs) are increasingly recognized not only as persistent particulate pollutants but also as active sources and vectors of phthalate esters (PAEs) in aquatic environments. Because PAEs are physically incorporated rather than chemically bonded within polymer matrices, they can be progressively released through leaching, photooxidation, mechanical abrasion, and biological interactions. This review synthesizes current understanding of MP-mediated PAE release, their interactions with co-contaminants, and the implications for ecological exposure. Environmental aging enhances polymer fragmentation and surface oxidation, accelerating additive desorption and altering sorption behavior. Field evidence from major river systems shows that high-molecular-weight PAEs, particularly DEHP and DBP, frequently dominate contamination profiles and contribute most significantly to ecological risk, with cumulative risk quotients (∑RQ) reaching up to 59.22 in heavily impacted watersheds. Ingestion of MPs by aquatic organisms further promotes in situ chemical transfer under gastrointestinal conditions, increasing internal exposure beyond dissolved-phase concentrations alone. Moreover, MPs act as multi-contaminant platforms, facilitating the co-transport of PAEs with metals and hydrophobic organic pollutants, thereby intensifying mixture toxicity and trophic transfer. Collectively, these processes demonstrate that MP-associated PAE release represents a dynamic and sustained pathway of chemical pollution requiring integrated risk assessment and source-control strategies.
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Microplastics: A major source of phthalate esters in aquatic environments
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Researchers demonstrated that microplastics are a major source of phthalate esters in aquatic environments, with PVC products leaching the highest concentrations and environmental factors like UV exposure and salinity increasing release rates.
Microplastics emerge as a hotspot for dibutyl phthalate sources in rivers and oceans: Leaching behavior and potential risks
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Researchers investigated how the plasticizer dibutyl phthalate leaches from PVC microplastics in both freshwater and seawater environments. They found that UV irradiation and water chemistry significantly influenced leaching rates, with higher release observed under simulated environmental conditions. The findings suggest that microplastics in rivers and oceans act as ongoing sources of potentially harmful chemical additives.
The Problem of Phthalate Occurrence in Aquatic Environment
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This review surveys phthalate contamination in aquatic environments, covering analytical quantification methods, toxicity data, and sources of phthalate pollution. It highlights phthalates as plastic additives that leach into water from plastic products, posing risks to aquatic organisms and human health.
Phthalate-induced effects in algae and fishes: insights into environmental toxicology
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This review of existing research found that phthalates—chemicals commonly found in plastics and personal care products—are harming fish and algae in waterways by disrupting their hormones, reproduction, and basic life processes. Since these chemicals build up in the food chain and we're exposed to them through contaminated water and seafood, this pollution could pose risks to human health too. The findings highlight the need for better regulations to limit phthalate pollution in our environment.
Plastic additives and microplastics as emerging contaminants: Mechanisms and analytical assessment
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Researchers reviewed how chemical additives mixed into plastics during manufacturing — including stabilizers, flame retardants, and plasticizers — can leach out throughout a plastic's lifecycle and pose risks to ecosystems and human health, with microplastics acting as carriers that concentrate and transport these hazardous chemicals.
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