Geochemistry signatures of mercury in soils of the Amazon rainforest biome.

Autor: Lima FRD; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Pereira P; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Silva Junior EC; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Vasques ICF; Soil and Plant Nutrition Department, Federal University of Viçosa, Viçosa, MG, Brazil., Oliveira JR; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Windmöller CC; Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil., Inda AV; Department of Soils, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil., Weindorf DC; Department of Earth and Atmospheric Sciences, Central Michigan University, Mount Pleasant, MI, USA., Curi N; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Ribeiro BT; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Guilherme LRG; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil., Marques JJ; Department of Soil Science, Federal University of Lavras, Lavras, MG, Brazil. Electronic address: jmarques@ufla.br.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2022 Dec; Vol. 215 (Pt 1), pp. 114147. Date of Electronic Publication: 2022 Sep 03.
DOI: 10.1016/j.envres.2022.114147
Abstrakt: Mercury (Hg) toxicity in soils depends on Hg species and other physical and chemical attributes, as selenium (Se) hotspots in soils, particularly relevant in Amazonian soils. The study of Hg species and their relations in representative locations of the Amazon rainforest biome is critical for assessing the potential risks of Hg in this environment. This work aimed to determine the concentration of total Hg and its species (Hg 0 , Hg 2 2+ and Hg 2+ ), and to correlate Hg total concentration with total elemental composition, magnetic susceptibility, and physicochemical attributes of Amazon soils. Nine sites in the Amazon rainforest biome, Brazil, were selected and analyzed for their chemical, physical, and mineralogical attributes. The clay fraction of the studied Amazon soils is dominated by kaolinite, goethite, hematite, gibbsite, and quartz. Mica was also found in soils from the States of Acre and Amazonas. Hg total ranged from 21.5 to 208 μg kg -1 (median = 104 μg kg -1 ), and the concentrations did not exceed the threshold value established for Brazilian soils (500 μg kg -1 ). The Hg 2+ was notably the predominant species. Its occurrence and concentration were correlated with the landscape position and soil attributes. Hg total was moderately and positively correlated with TiO 2 , clay, and Se. The findings showed that geographic location, geological formation, and pedological differences influence the heterogeneity and distribution of Hg total in the studied soil classes. Thus, a detailed characterization and knowledgment of the soil classes is very important to clarify the complex behavior of this metal in the Amazon rainforest biome.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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