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

Autor: Ygor O.S. Rodrigues, José G. Dórea, P.M.B. Landim, José Vicente Elias Bernardi, Lucas Cabrera Monteiro, João Pedro Rudrigues de Souza, Lilian de Castro Moraes Pinto, Iara Oliveira Fernandes, João Victor Villela de Souza, Antônia Roberto Sousa, Juruna de Paula Sousa, Bruno Leandro Oliveira Maciel, Francisco Marcos dos Santos Delvico, Jurandir Rodrigues de Souza
Přispěvatelé: University of Brasília, University of Brasilia, Universidade Estadual Paulista (UNESP), Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Rok vydání: 2022
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 0013-9351
Popis: Made available in DSpace on 2022-04-29T08:37:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-04-01 Universidade de Brasília 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. Geostatistics and Geodesy Laboratory Faculty UnB Planaltina University of Brasília Faculty of Health Sciences University of Brasilia, Asa Norte Geomathematics Laboratory São Paulo State University/UNESP, Rio Claro Graduate Program in Ecology Institute of Biological Sciences University of Brasília, Asa Norte Laboratory of Analytical and Environmental Chemistry Institute of Chemistry University of Brasília, Asa Norte Graduate Program in Environmental Sciences Faculty UnB Planaltina University of Brasília EMBRAPA Solos, Parque Estação Biológica - PqEB S/n Geomathematics Laboratory São Paulo State University/UNESP, Rio Claro
Databáze: OpenAIRE
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