{
  "abstract": "The plastisphere critically modulates interactions among microplastics (MPs), biofilms, and trace metals under environmentally realistic conditions, governing the interfacial reactivity of plastisphere-coated microplastics. Here, we investigated cobalt (Co) adsorption onto large polypropylene (PP) primary microplastics (~4 mm) exposed for 28 days in a flow-through riverine mesocosm across a gradient of Co concentrations (0–60 µg·L−1). A multi-technique analytical approach was employed, combining inductively coupled plasma mass spectrometry (ICP-MS), laser ablation ICP-MS (LA-ICP-MS), quantitative PCR (qPCR), and scanning electron microscopy (SEM). Cobalt accumulation increased linearly with time, consistent with apparent first-order dependence on aqueous Co concentration under constant exposure, reaching 38 ± 3 mg·kg−1 after 28 days at 60 µg·L−1, with no saturation observed. The concentration-dependent Co accumulation was well described by an empirical power-law model (Q = KC0n), with the empirical coefficient K increasing linearly over time, reflecting the progressive increase in Co accumulation at a given aqueous concentration. Microbial colonization developed rapidly on MPs, with 16S and 18S rRNA gene copy numbers stabilizing after 14 days, while surface-normalized Co signals increased sharply after day 21, indicating a time-dependent modification of biofilm properties influencing Co retention. SEM confirmed complex microbial structures, including diatom-like cells. No cobalt adsorption was observed under sterile conditions, confirming the key role of biofilm presence. These findings highlight the dynamic role of the plastisphere as a chemically and biologically active interface under environmentally realistic riverine conditions, with implications for contaminant fate, bioavailability, and risk assessment in freshwater systems affected by plastic pollution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 9,
  "authors": [
    {
      "name": "Maud Gautier"
    },
    {
      "name": "Séverine Le Faucheur"
    },
    {
      "name": "Sandra Mounicou"
    },
    {
      "name": "Javier Jiménez-Lamana"
    },
    {
      "name": "Virginie Pellerin"
    },
    {
      "name": "Marisol Goñi-Urriza"
    },
    {
      "name": "Claire Gassie"
    },
    {
      "name": "Stéphanie Reynauld"
    },
    {
      "name": "Bruno Grassl"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fgarr14zz5yqk.bib",
  "cited_by": 0,
  "doi": "10.3390/microplastics5030174",
  "fulltext_url": null,
  "id": "fgarr14zz5yqk",
  "issns": [
    "2673-8929"
  ],
  "landing_url": "https://hal.science/hal-05757693v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "0.sde"
    ],
    [
      "openalex",
      "2310|Microplastics and Plastic Pollution"
    ]
  ],
  "openalex": "W7204989193",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": "mdpi",
  "ris": "https://research.draconitic.com/paper/fgarr14zz5yqk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:37Z",
      "native_id": "hal-05757693",
      "source": "hal",
      "url": "https://hal.science/hal-05757693v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:0.chim",
      "subfield": "general"
    },
    {
      "field": "earth",
      "origin": "hal:0.sde",
      "subfield": "environmental-science"
    }
  ],
  "title": "Adsorption of Cobalt onto Microplastics in Riverine Mesocosms: Influence of Biofilm Development",
  "title_text": "Adsorption of Cobalt onto Microplastics in Riverine Mesocosms: Influence of Biofilm Development",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:37Z",
  "url": "https://research.draconitic.com/paper/fgarr14zz5yqk",
  "venue": "Microplastics",
  "versions": []
}