Mercury spatiality and mobilization in roadside soils adjacent to a savannah ecological reserve.

Autor: Rodrigues YOS; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Dórea JG; Faculty of Health Sciences, University of Brasilia, Asa Norte, Brasília, Distrito Federal, 70919-970, Brazil., Landim PMB; Geomathematics Laboratory, São Paulo State University/UNESP, Rio Claro, São Paulo, 13506-700, Brazil., Bernardi JVE; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil. Electronic address: bernardi@unb.br., Monteiro LC; Graduate Program in Ecology, Institute of Biological Sciences, University of Brasília, Asa Norte, Brasília, Distrito Federal, 70910-900, Brazil., de Souza JPR; Laboratory of Analytical and Environmental Chemistry, Institute of Chemistry, University of Brasília, Asa Norte, Brasília, Distrito Federal, 70910-900, Brazil., Pinto LCM; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Fernandes IO; Graduate Program in Environmental Sciences, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., de Souza JVV; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Sousa AR; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Sousa JP; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Maciel BLO; Geostatistics and Geodesy Laboratory, Faculty UnB Planaltina, University of Brasília, Planaltina, Distrito Federal, 73345-010, Brazil., Delvico FMDS; EMBRAPA Solos, Parque Estação Biológica - PqEB S/n, Brasília, Distrito Federal, 70770-901, Brazil., de Souza JR; Laboratory of Analytical and Environmental Chemistry, Institute of Chemistry, University of Brasília, Asa Norte, Brasília, Distrito Federal, 70910-900, Brazil.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2022 Apr 01; Vol. 205, pp. 112513. Date of Electronic Publication: 2021 Dec 11.
DOI: 10.1016/j.envres.2021.112513
Abstrakt: Mercury (Hg) is a persistent environmental pollutant of global concern. Recognized anthropic contributions to environmental Hg pollution include fuel fossil emissions, soil erosion, and industrial and mining activities. Environmental Hg that enters water bodies can be methylated before entering the food chain and contaminating man and wildlife. We used a kriging approach for sampling and X-ray crystallography to study the pressure of road-traffic Hg emissions on soil Hg concentrations in an ecological reserve (ESECAE) in Central Brazil' savannah. We took samples of organic (n = 144) and mineral (n = 144) layers from the road-side and from the undisturbed soils at 0.1, 1, and 2 km from traffic, inside the ESECAE. Overall, total mercury (THg) concentrations determined by atomic absorption spectrophotometry were significantly higher in the organic layer than in the mineral layer. The mean soil THg in the organic and mineral layers was highest at the roadside (respectively 19.77 ± 12.01 and 16.18 ± 11.54 μg g -1 ), gradually decreasing with the distance from the road. At 2 km, the mean soil THg was 0.09 ± 0.30 and 0.029 ± 0.03 μg g -1 , respectively, for the organic and mineral layers. X-ray crystallography showed mineralogical similarity of the sampled soils, indicating Hg externality, i.e, it did not originate from existing soil minerals. Co-kriging analysis (n = 288) confirmed Hg hotspots on the roadsides and a faster mobilization occurring up to a distance of 1 km for both layers. The soil reception and retention of traffic Hg emissions are mainly in the organic layer and can impact subsoil and adjacent areas. Thus, traffic soil-Hg pollution is limited to the road proximities; THg concentrations are high up to 100 m with an inflection point at 1 km.
(Copyright © 2021. Published by Elsevier Inc.)
Databáze: MEDLINE
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