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Are Microplastic (∼25–1000 μm) and Plasticizer Concentrations Correlated in Sediments of an Urbanized UK Estuary?
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Researchers investigated whether plasticizer concentrations in environmental samples correlate with measured microplastic levels, testing the assumption that chemical additives can serve as proxies for plastic particle abundance. The findings clarify the reliability (and limitations) of using leached chemicals to infer microplastic contamination.
An understanding of the relationships between plastics and plasticizers is vital in order to assess their environmental risk. We investigated spatial trends and relationships between microplastics and plasticizers in sediments of an urbanized estuary subject to contemporary and historic sources of contamination (Forth estuary, Scotland, UK). As such, this study represents one of the first to investigate the co-occurrence of emerging plasticizers, phthalates, and microplastics in an estuary system. We determined the concentration of 7 legacy (phthalate) and 3 emerging (adipate, terephthalate, trimellitate) plasticizers and 21 microplastic polymer types. The most abundant microplastics were polyethylene (PE), polypropylene (PP), polyurethane (PU), and poly(vinyl chloride) (PVC). Plasticizers were dominated by diethylhexyl phthalate (DEHP), although emerging plasticizers (e.g., diethylhexyl terephthalate, DEHTP) were frequently detected at low concentrations (mean 7.3 ng g-1 ww). There was strong evidence that concentrations of microplastics and plasticizers were significantly lower in the outer estuary. However, we found no evidence for a spatial relationship between the concentration of microplastics and plasticizers at individual site level. Our results indicate that microplastics in the size range analyzed (∼25-1000 μm) may not be a good predictor of the spatial distribution of plasticizers in estuaries. This could result from release of plasticizers prior to plastic fragmentation and deposition and differences in transport and fate.
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AreMicroplastic(∼25–1000 μm)and Plasticizer Concentrations Correlated in Sediments of an UrbanizedUK Estuary?
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Researchers investigated the co-occurrence of microplastics and plasticizers in sediments of the urbanized Forth estuary in Scotland, finding no spatial correlation between microplastic concentrations and plasticizer levels at individual sites, suggesting that microplastics in the 25-1000 µm size range are not reliable predictors of plasticizer distribution in estuarine environments.
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This review examined the occurrence and fate of legacy and emerging plasticizers in coastal and estuarine environments, highlighting the chemical risks posed by these plastic additives beyond the physical effects of microplastics themselves.
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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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Plastic-derived chemical pollutants — including endocrine disruptors and mutagens leached from plastic debris — accumulate persistently in estuarine sediments, water, and aquatic organisms, and can serve as tracers for overall microplastic contamination levels. Estuaries are particularly vulnerable hotspots where riverine plastic pollution converges with coastal marine environments, amplifying ecological and human health risks.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.