Mercury distribution in organisms, litter, and soils of the Middle Araguaia floodplain in Brazil.

Autor: Fernandes IO; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil. iara158@gmail.com., Monteiro LC; Graduate Program in Ecology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil., de Miranda VL; Graduate Program in Zoology, Institute of Biological Sciences, University of Brasília, Brasília, Distrito Federal, 70910-900, Brazil., Rodrigues YOS; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., de Freitas Muniz DH; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., de Castro Paes É; Graduate Program in Soils and Plant Nutrition, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., Bernardi JVE; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Mar; Vol. 31 (14), pp. 20925-20940. Date of Electronic Publication: 2024 Feb 21.
DOI: 10.1007/s11356-024-32317-x
Abstrakt: Mercury (Hg) is a chemical element that, depending on its concentration, may become toxic to living organisms due to the ability of Hg to bioaccumulate in food chains. In this study, we collected samples of soil, litter, and organisms in the Middle Araguaia floodplain, Brazil. Total mercury (THg) concentrations in litter were significantly higher (p < 0.0001) than that in soil, ranging from 10.68 ± 0.55 to 48.94 ± 0.13 and 20.80 ± 1.07 to 55 .19 ± 1.59 ng g -1 , respectively. Total mercury concentration levels in soil showed a linear, inversely proportional relationship with soil organic matter (SOM) contents and soil pH, consistent with the geochemical behavior of chemical elements in flooded environments. Ten orders of organisms were identified, and the average THg concentrations determined in their bodies were up to 20 times higher than those in soil and litter. We found a significant linear relationship between the levels of THg in litter and those found in soil organisms, thereby allowing the prediction of THg concentration levels in soil organisms through the analysis of litter at the sample units. The different dynamics and feeding habits of soil organisms and the concentration of THg in these organisms may be influenced by the river's course. This study provides evidence of the bioaccumulation of THg in soil organisms in the floodplain of the Middle Araguaia River, an important river basin in the Brazilian savanna.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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