To what extent can micro-and macroplastics be trapped in sedimentary particles? A case study investigating dredged sediments

Archive ouverte : Article de revue

Constant, Mel | Alary, Claire | de Waele, Isabelle | Dumoulin, David | Breton, Noémie | Billon, Gabriel

Edité par HAL CCSD

International audience. Plastic wastes and their fragments (microplastics, MPs <5 mm) represent a global, persistent, and ubiquitous threat to ecosystems. Their sources, transfers and fates are still poorly understood, especially in rivers. To fill this gap, sediments were collected from two dredging disposal sites along the Aa River (France). Four pits were dug, and triplicate samples were obtained at four depths (down to 140 cm). The sediments were sieved to 5 mm to collect macroplastics (MaPs). MPs were separated from the sediment based on density using a NaI solution (1.6 g/mL). Suspected plastics were analyzed with Fourier Transform InfraRed (FTIR) spectroscopy. The studied sediments were found to be widely contaminated with concentrations ranging from 0.97 to 77 MaPs/kg and from 0.78 to 2800 MPs/kg, which were one to four orders of magnitude lower than those in most polluted European riverbeds. The MaPs were principally PE, PP, PS and PVC films, whereas the MPs were mainly PA and PES fibers. The plastic concentrations and features of the two sites, which were filled at two different times, differed. Several factors occurring before and after dredging operations may explain these discrepancies. Nevertheless, no relationships with the sediment features were noted, and thus, one major driving force could not be identified. At the site scale, more than 1 ton of plastic could be stored. In conclusion, this study highlights the importance of dredged sediments for past plastic pollution studies and global plastic budget estimations.

Consulter en ligne

Suggestions

Du même auteur

Prospective study on macroplastics and microplastics within dredging sediments | Constant, Mel

Prospective study on macroplastics and microplastics within dredging sedime...

Archive ouverte: Communication dans un congrès

Constant, Mel | 2021-06-29

International audience. Plastic waste and their fragments (microplastics, <5 mm) are a global, persistent, and ubiquitous threat for ecosystems [1]. They are ingested by numerous species, which could cause harmful e...

Separation of microplastics and sediments: a comparative analysis of extracting methods | Constant, Mel

Separation of microplastics and sediments: a comparative analysis of extrac...

Archive ouverte: Poster de conférence

Constant, Mel | 2021-06-09

International audience

Caractérisation de la disponibilité environnementale et toxicologique de Cd et Pb dans des anthroposols issus de sédiments de dragage fluviaux | Nguyen, Van-Xuan

Caractérisation de la disponibilité environnementale et toxicologique de Cd...

Archive ouverte: Communication dans un congrès

Nguyen, Van-Xuan | 2018

COM. International audience

Du même sujet

Prospective study on macroplastics and microplastics within dredging sediments | Constant, Mel

Prospective study on macroplastics and microplastics within dredging sedime...

Archive ouverte: Communication dans un congrès

Constant, Mel | 2021-06-29

International audience. Plastic waste and their fragments (microplastics, <5 mm) are a global, persistent, and ubiquitous threat for ecosystems [1]. They are ingested by numerous species, which could cause harmful e...

Occurrence and identification of microplastics in beach sediments from the Hauts-de-France region | Doyen, Périne

Occurrence and identification of microplastics in beach sediments from the ...

Archive ouverte: Article de revue

Doyen, Périne | 2019

International audience. The present work was carried out to quantify microplastics (MP) from three sandy beaches along the Côte d’Opale coastline located in the Hauts-de-France region of northern France. Three diffe...

Miscanthus x giganteus culture on soils highly contaminated by metals: Modelling leaf decomposition impact on metal mobility and bioavailability in the soil\textendashplant system | Al-Souki, Karim-Suhail

Miscanthus x giganteus culture on soils highly contaminated by metals: Mode...

Archive ouverte: Article de revue

Al-Souki, Karim-Suhail | 2020

ACL. Miscanthus x giganteus is suggested as a good candidate for phytostabilization of metal-polluted soils. Its late harvest in winter generates large amounts of leaf litter on the soil surface. However, little is ...

Exposure to multiple air pollutants and the incidence of coronary heart disease: A fine-scale geographic analysis | Occelli, Florent

Exposure to multiple air pollutants and the incidence of coronary heart dis...

Archive ouverte: Article de revue

Occelli, Florent | 2020

ACL. Geographical variations in cardiovascular disease rates have been linked to individual air pollutants. Investigating the relation between cardiovascular disease and exposure to a complex mixture of air pollutan...

Residential exposure to outdoor air pollution and adult lung function, with focus on small airway obstruction | Havet, Anaïs

Residential exposure to outdoor air pollution and adult lung function, with...

Archive ouverte: Article de revue

Havet, Anaïs | 2020

ACL. Although a growing body of evidence suggests that chronic exposure to outdoor air pollution is linked to a decline in lung function, data on flow at low lung volumes that may be more specific of small airway ob...

An Overview of litter decomposition in soils for a diversity of agronomic and pedoclimatic contexts | Jacqueton, Céline

An Overview of litter decomposition in soils for a diversity of agronomic a...

Archive ouverte: Poster de conférence

Jacqueton, Céline | 2021-08-23

International audience

Chargement des enrichissements...