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Quantificação e distribuição vertical de microplásticos na coluna d’agua em represa urbana
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This Brazilian study measured microplastic concentrations at different depths in an urban reservoir over six months, comparing surface and mid-column samples. The work contributes to understanding how microplastics distribute vertically in freshwater bodies, an area less studied than marine environments.
In recent years, research has shown the presence of microplastics in aquatic environments worldwide. Microplastics are 5 mm or less, reaching up to a few micrometers. The main focus of research on microplastics is the marine environment, doing microplastics in the freshwater environment a vast field for further studies. In this study, 36 water samples were collected in an urban area over a period of six months (July to December), with half of the samples being collected on the water surface and the other half in the middle of the water column. In the laboratory the samples were purified and analyzed by the visual method with a microscope. The results were quantified and cataloged in terms of size, shape and color. This study identified 184 microplastic particles in the samples, indicating a predominance of transparent microplastics over colored and filaments over fragments at the study site. An average total of 20.99 particles/m³ was recorded. There was a small monthly variation in microplastic abundance regardless of depth, except in November and December, which had a significant variation. This study indicates that for a correct observation of microplastic abundance it is necessary to analyze the abundance in multilayers of the water column. The results point to a greater abundance on the surface than in the middle of the water column. Further studies are needed with a longer monitoring period to analyze, for example, ensure the influence of rainfall.
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Revealing microplastic dynamics: the impact of precipitation and depth in urban river ecosystems
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Microplastic abundance was monitored at different depths and during different precipitation events in urban rivers in Brazil, finding that rainfall significantly increases MP concentrations and that deeper water layers can carry higher loads than surface water.
Spatial Distribution of Microplastic Polymers in the Water Column of a Freshwater Drinking Supply
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Researchers studied how microplastics are distributed at different depths within a freshwater reservoir used as a drinking water supply, finding that these particles are present throughout the water column. The findings raise concern about microplastic exposure through tap water and highlight gaps in current drinking water treatment.
Microplastics in Surface Water, Water Column, and Sediments: Emergent Contaminants in Alhajuela Lake Reservoir in the Panama Canal Watershed
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Researchers measured microplastic concentrations across surface water, the water column, and sediments in Lake Alhajuela — a reservoir supplying water to Panama City and the Canal — finding mean levels of 759 MPs/L at the surface and confirming significant seasonal variation, with small fragments and fibers predominating.
Vertical Distribution of Microplastics in the Water Column and Surficial Sediment from the Milwaukee River Basin to Lake Michigan
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Microplastics were measured in water surface, water subsurface, and sediment samples along the Milwaukee River continuum to Lake Michigan, finding density-dependent vertical distribution with low-density polymers concentrated at the surface and high-density polymers in sediments. The study demonstrates a clear polymer partitioning pattern with depth in freshwater systems.
Distribution Pattern of Microplastics in Aquatic Sources
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Researchers reviewed the distribution patterns of microplastics across freshwater and marine environments, highlighting how single-use plastics break down into particles that accumulate throughout aquatic ecosystems. The widespread distribution of microplastics in water bodies raises serious ecotoxicological concerns for aquatic life and for people who consume water from these sources.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.