Microplastics in sediments of the Pantanal Wetlands, Brazil

Abstract

Microplastics (<5 mm) can have negative and deleterious environmental effects. However, the scarce information on the levels of microplastics and the factors underlying their input in wetlands, limits the understating of the vulnerability of these ecosystems to microplastics. To contribute closing this important information gap, the concentration (items/m−2), size and the variables related to the distribution of microplastics in fluvial sediments of the Cuiabá River, a tributary of the Pantanal, the world largest flooded Savanna and a UNESCO World Heritage were investigated. The mean microplastic level was 576.8 ± 577.8 items/m−2 of sediments which were mainly fragments (309.0 ± 319.6 items/m−2) and fibers (267.8 ± 339.9 items/m−2). The maximum level was 1938.8 items/m−2 found in the urban stretch of the sister cities of Cuiabá and Várzea Grande, the largest urban agglomeration in the study area. Unexpectedly, the composition of the microplastic with highest average level (240.7 ± 310.4 items/m−2), a blue synthetic fiber, could not be unequivocally determined by RAMAN spectrometry. Its complex composition includes Pb, Li and Nb, suggesting it may derive from electronic waste. Polypropylene (159.2 ± 133.4 items/m−2) and Polyvinyl Chloride (104.6 ± 217.2 items/m−2) were the second and third polymers with higher average levels. The average size of microplastics particles in sampling sites ranged from 0.18 mm to 1.74 mm. Microplastic concentration was positively related to urban areas. Similarly, microplastics particles size decreased with distance from urban areas. These results suggest that urban areas along the Cuiabá River, with poor waste management, are a major source of microplastic pollution in the Pantanal floodplain and that electronic waste might contribute significantly to this contamination. This study highlights the importance of adequate waste management in cities to limit microplastic contamination in areas of ecological importance, such as the Pantanal.

Microsynthetics in waters of the South American Pantanal

“…However, their composition is not reported (Gray et al, 2018;Leads and Weinstein, 2019). Blue fibres with similar RAMAN spectra were also reported in Pantanal beach sediments and associated with e-waste (Camargo et al, 2022). Abundances and concentrations of plastic debris in soil from an abandoned e-waste site in China were at the high end in results from the literature.…”

Multilevel Toxicity Evaluations of Polyethylene Microplastics in Zebrafish (Danio rerio)

“…In Brazil, studies have revealed the presence of polyethylene in coastal sediments [ 12 ] and on the seacoast of several states [ 13 , 14 ]. Another study states that polyethylene plastics are also widely found in the digestive tract of different aquatic or terrestrial species, such as fish, amphibians and microcrustaceans.…”