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The Fate of Microplastics in Rural Headwater Lake Catchments.
Welsh, Brittany; Paterson, Andrew M; Yao, Huaxia; McConnell, Chris; Aherne, Julian.
Afiliación
  • Welsh B; School of the Environment, Trent University, Peterborough, Ontario K9L 0G2, Canada.
  • Paterson AM; Ministry of the Environment, Conservation and Parks, Inland Waters Unit, Dorset, Ontario P0A 1E0, Canada.
  • Yao H; Ministry of the Environment, Conservation and Parks, Inland Waters Unit, Dorset, Ontario P0A 1E0, Canada.
  • McConnell C; Ministry of the Environment, Conservation and Parks, Inland Waters Unit, Dorset, Ontario P0A 1E0, Canada.
  • Aherne J; School of the Environment, Trent University, Peterborough, Ontario K9L 0G2, Canada.
Environ Sci Technol ; 58(37): 16570-16577, 2024 Sep 17.
Article en En | MEDLINE | ID: mdl-39231004
ABSTRACT
In this study, the fluxes of microplastics (mp) were quantified during a 12-month period for three rural headwater lake catchments in Muskoka-Haliburton, south-central Ontario, Canada. A novel catchment particle balance approach was used, incorporating inputs from atmospheric deposition and stream inflows against lake outflow and sedimentation. This approach provides the first reported observation-based estimates of microplastic residence time in freshwater lakes. Atmospheric deposition had the highest daily microplastic flux (3.95-8.09 mp/m2/day), compared to the inflow streams (2.21-2.34 mp/m2/day), suggesting that it is the dominant source of microplastics to rural regions. Approximately 44-71% of the deposited microplastics were retained in the terrestrial catchments and 30-49% of the microplastics in the stream inflows were retained in the study lakes. Given that output fluxes ranged from 0.72-3.76 mp/m2/day in the sediment and 1.18-1.66 mp/m2/day in the lake outflows, the microplastic residence time was estimated to be between 3 and 12 years, suggesting that lakes are an important reservoir for microplastics. Fibers were the dominant shape in atmospheric deposition, streamwater, and lake water; however, in lake sediment, there was a higher proportion of fragments. Across all media, poly(ethylene terephthalate) was the dominant polymer identified (23%).
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Lagos / Microplásticos País/Región como asunto: America do norte Idioma: En Revista: Environ Sci Technol Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Lagos / Microplásticos País/Región como asunto: America do norte Idioma: En Revista: Environ Sci Technol Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos