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Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Environmental Sources Marine & Wildlife Policy & Risk Sign in to save

Time-varying microplastic contributions of a large urban and industrial area to river sediments

Environmental Pollution 2024 20 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Johnny Gaspéri, Johnny Gaspéri, Jean Pruvost, Elie Dhivert, Elie Dhivert, Johnny Gaspéri, Jean Pruvost, Elie Dhivert, Johnny Gaspéri, Elie Dhivert, Johnny Gaspéri, Elie Dhivert, Johnny Gaspéri, Brice Mourier, Bruno Tassin Elie Dhivert, Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Brice Mourier, Brice Mourier, Bruno Tassin Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Jean Pruvost, Johnny Gaspéri, Johnny Gaspéri, Elie Dhivert, Elie Dhivert, Elie Dhivert, Elie Dhivert, Johnny Gaspéri, Elie Dhivert, Jean Pruvost, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Elie Dhivert, Elie Dhivert, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Elie Dhivert, Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Thierry Winiarski, Thierry Winiarski, Elie Dhivert, Elie Dhivert, Thierry Winiarski, Thierry Winiarski, Florence Delor‐Jestin, Florence Delor‐Jestin, Elie Dhivert, Bruno Tassin Elie Dhivert, Bruno Tassin Bruno Tassin Brice Mourier, Brice Mourier, Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Brice Mourier, Bruno Tassin Bruno Tassin Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Johnny Gaspéri, Bruno Tassin Bruno Tassin Johnny Gaspéri, Bruno Tassin Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Johnny Gaspéri, Thierry Winiarski, Johnny Gaspéri, Jean Pruvost, Johnny Gaspéri, Johnny Gaspéri, Jean Pruvost, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Florence Delor‐Jestin, Bruno Tassin Bruno Tassin Thierry Winiarski, Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Florence Delor‐Jestin, Johnny Gaspéri, Johnny Gaspéri, Thierry Winiarski, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Johnny Gaspéri, Brice Mourier, Brice Mourier, Bruno Tassin Bruno Tassin Brice Mourier, Bruno Tassin Bruno Tassin Thierry Winiarski, Thierry Winiarski, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Thierry Winiarski, Elie Dhivert, Bruno Tassin Bruno Tassin Bruno Tassin Elie Dhivert, Elie Dhivert, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Thierry Winiarski, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Brice Mourier, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Johnny Gaspéri, Bruno Tassin Bruno Tassin Elie Dhivert, Thierry Winiarski, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Elie Dhivert, Bruno Tassin Johnny Gaspéri, Elie Dhivert, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Bruno Tassin Brice Mourier, Bruno Tassin Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin Bruno Tassin Brice Mourier, Johnny Gaspéri, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Brice Mourier, Bruno Tassin Johnny Gaspéri, Johnny Gaspéri, Bruno Tassin

Summary

Researchers analyzed dated sediment cores from upstream and downstream of a large city to track microplastic pollution trends from the 1980s to 2021. They found that downstream contamination was roughly ten times higher than upstream, but that industrial-source plastics showed a relative decline since the 2000s. The study provides rare long-term historical data suggesting that some pollution reduction policies may be having a measurable effect.

Polymers
PE PP PS PTFE PVC
Study Type Environmental

The quantification of microplastic (MP) pollution in rivers is often constrained by a lack of historical data on a multi-decadal scale, which hinders the evaluation of public policies. In this study, MP contents and trends were analyzed in dated sediment cores sampled upstream and downstream of a large metropolis, in environmental deposits that exhibited consistent sedimentation patterns from the 1980s to 2021. After a thorough sedimentological analysis, MPs were quantified in samples by micro Fourier Transform InfraRed spectroscopy (μFTIR imaging) and a density separation and organic matter digestion procedure. Microplastics recorded in the upstream core are relatively ubiquitous all along the dated sequence. The results also confirmed a sever increase of microplastics levels in the downstream core, by one order of magnitude, and an increase of polymer types. Polypropylene, polyethylene, and polystyrene represent ubiquitous contamination and were predominant at the two stations, whereas polyvinyl chloride and polytetrafluoroethylene were suspected to be abundant at the downstream station, but were not detected at the upstream station. Their presence could be linked to local contamination from specific industrial sources that manufactured and utilized these polymers. Surprisingly, in the downstream station sediment has recorded a relative improvement in polymers associated with industrial sources since the 2000s and, to a lesser extent, for ubiquitous ones since the 2010s. This trend of mitigation diverges from that of global assessments, that assume uncontrolled MP pollution, and suggest that European Union wastewater policy and regulation on industrial discharges have positively influenced water quality, and certainly also on MPs. However, the accumulation of microplastics remains high in recent deposits and raises the emerging concern of the long-term management of these reservoirs.

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