Evidence for a correlation between total lead concentrations in soils and the presence of geological faults

Autor: Marcos R. Moreira-Silva, Manoel Carlos Toledo Franco de Godoy, Carlos Alberto Tello Sáenz, Marcos F.S. Teixeira, João Osvaldo Rodrigues Nunes
Přispěvatelé: Universidade Estadual Paulista (Unesp)
Rok vydání: 2017
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Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1610-3661
1610-3653
DOI: 10.1007/s10311-017-0617-3
Popis: Made available in DSpace on 2018-12-11T16:46:12Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-09-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The emission of radon gas in regions of geological faults, during the radioactive decay of uranium and thorium, results in the formation of lead isotopes 210Pb, 208Pb, 207Pb and 206Pb. As a consequence, the lead contamination in the soil poses a hazard to humans through ingestion of food, contaminated water, and even by direct contact with the soil contaminant. So far the relationship between the occurrence of geological faults and soil Pb contamination has not been established. Here, we studied lead in soils of regions with geological faults and their possible relationship with radon emissions. Soils were sampled from Presidente Prudente located in the far west of São Paulo State, Brazil. The region has strong evidence of the existence and direction of geological faults at depths of approximately 200 m. Soil sampling was done according to the USEPA 3050 method. Total lead was quantified by anodic stripping voltammetry. Results show that the total Pb concentration increases systematically with soil depth. This finding is explained by the fact that the lead originates from radon emissions. Pearson correlation analysis further proves a relationship of the nuclear track density obtained with CR-39 detectors, and mean Pb levels within each soil profile. Overall, our findings should improve risk evaluation of Pb contamination derived from radon emission and geological faults. Department of Chemistry and Biochemistry Faculty of Science and Technology São Paulo State University (UNESP) Department of Physics Faculty of Science and Technology São Paulo State University (UNESP) Department of Geography Faculty of Science and Technology São Paulo State University (UNESP) Department of Chemistry and Biochemistry Faculty of Science and Technology São Paulo State University (UNESP) Department of Physics Faculty of Science and Technology São Paulo State University (UNESP) Department of Geography Faculty of Science and Technology São Paulo State University (UNESP) CNPq: 234256/2014-1 CNPq: 302728/2012-0
Databáze: OpenAIRE
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