Spatial and temporal distribution of microplastics in water and sediments of a freshwater system (Antuã River, Portugal)

The Science of the Total Environment
M O RodriguesA M M Gonçalves

Abstract

Microplastics (particles with a size<5mm), one of the most emerging aquatic pollutants, are of particular concern since they can reach high densities and interact with biotic and abiotic environment. The occurrence of microplastics in freshwater systems is less understood than in marine environment. Hence, the present study aims to provide new insights into microplastics abundances and distribution in Antuã River (Portugal) by applying the isolation method of wet peroxide oxidation with addition of zinc chloride to water and sediment samples collected in March and October 2016, in three sampling sites. The abundance of microplastics in water ranged from 5 to 8.3mgm-3 or 58-193itemsm-3 in March and from 5.8-51.7mgm-3 or 71-1265itemsm-3 in October. In sediments, the abundance ranged from 13.5-52.7mgkg-1 or 100-629itemskg-1 in March and from 2.6-71.4mgkg-1 or 18-514itemskg-1 in October. The water and sediment samples with the greatest abundances were from São João da Madeira and Aguincheira, respectively. Spatio-temporal distribution showed different pattern according to methodological approaches, seasonal and hydrodynamic conditions and the proximity to urban/industry areas. Analysis of plastics by Fourier transform infrared spec...Continue Reading

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