Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 776, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.145999
Keywords
Microplastics; Douro river; Nile Red; Sources of microplastics
Categories
Funding
- Portuguese Science Foundation (FCT), under POCH funds [PD/BD/135581/2018]
- European Social Fund
- Portuguese National Funds from MEC
- FEDER, through COMPETE 2020 -Programa Operacional Competitividade e Internacionalizacao (POCI) [UIDP/50017/2020 + UIDB/50017/2020]
- national funds (OE), through FCT/MCTES
- national funds (OE), through FCT
- Fundacion CEI.MAR throughmovility programme Ayudas de Movilidad Internacional para Estudiantes de Doctorado - Secretaria General de Universidades, Investigacion y Tecnologia de la Consejeria de Economia, Conocimiento, Empresas y Universidad de la Ju
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This study assessed the concentrations of microplastics and fibers in three different areas of the Douro river in Porto, Portugal. The results suggest that the wastewater treatment effluent and boat dock/maintenance are likely sources of high concentrations of microplastics and fiber contamination.
Sources contributing to specific concentration of microplastics and fibers are still not completely understood. This study aimed at assessing the concentrations of microplastics (2-5000 mu m) and fibers (18-5667 mu m) in three areas of distinct influences in the Douro river, Porto, Portugal: (i) a countryside area; (ii) a wastewater treatment effluent release zone; and (iii) an area in proximity to a boat dock and maintenance station. Nile Red staining coupled with microscopy allowed the identification of small microplastics (>= 2 mu m) with a median concentration of the three areas of 231 MP L-1. Most were fragments (69%). Sizes <40 mu m were the most abundant (84%). Highest concentrations of microplastics were found near the boat dock/maintenance and lowest in the countryside area. Fibers were mostly natural (non-synthetic, 63%). Highest concentrations of fibers were found in the area influenced by the wastewater effluent, especially of synthetic fibers, and lowest in the countryside area. Concentration of all fibers and synthetic fibers was 46 F L-1 and 6 F L-1, respectively. High concentrations of microplastics and fiber contamination suggest that the wastewater treatment plant effluent and boat dock/maintenance are the likely sources originating hotspot areas. (C) 2021 Elsevier B.V. All rights reserved.
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