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Speciation of arsenic in bulk and rhizosphere soils from artisanal cooperative mines in Bolivia.
Acosta, Jose A; Arocena, Joselito M; Faz, Angel.
Afiliação
  • Acosta JA; Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Department of Agrarian Science and Technology, Technical University of Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Spain.
  • Arocena JM; Environmental Science Program, University of Northern British Columbia, Prince George, BC V2N 4Z9, Canada.
  • Faz A; Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Department of Agrarian Science and Technology, Technical University of Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Spain.
Chemosphere ; 138: 1014-20, 2015 Nov.
Article em En | MEDLINE | ID: mdl-25577694
Soils near artisanal and small-scale gold mines (ASGM) have high arsenic (As) contents due to the presence of arsenopyrite in gold ores and accelerated accumulations due to mine wastes disposal practices and other mining activities. We determined the content and speciation to understand the fate and environmental risks of As accumulations in 24 bulk and 12 rhizosphere soil samples collected in the Virgen Del Rosario and the Rayo Rojo cooperative mines in the highlands of Bolivia. Mean total As contents in bulk and rhizosphere soils ranged from 13 to 64 mg kg(-1) and exceeded the soil environmental quality guidelines of Canada. Rhizosphere soils always contained at least twice the As contents in the bulk soil. Elemental mapping using 4×5 µm synchrotron-generated X-ray micro-beam revealed As accumulations in areas enriched with Fe. Results of As-X-ray Absorption Near Edge Spectroscopy (As-XANES) showed that only As(V) species was detectable in all samples regardless of As contents, size fractions and types of vegetation. Although the toxicity of As(V) is less than As(III), we suggest that As uptake of commonly-grazed vegetation by alpaca and llama must be determined to fully understand the environmental risks of high As in soils near ASGM in Bolivia. In addition, knowledge on the speciation of the As bio-accessible fraction will provide another useful information to better understand the fate and transfer of As from soils into the food chain in environments associated with the ASGM in Bolivia and other parts of the world.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Solo / Poluentes do Solo / Rizosfera / Ouro / Mineração Tipo de estudo: Guideline País/Região como assunto: America do sul / Bolivia Idioma: En Revista: Chemosphere Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Espanha País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Arsênio / Solo / Poluentes do Solo / Rizosfera / Ouro / Mineração Tipo de estudo: Guideline País/Região como assunto: America do sul / Bolivia Idioma: En Revista: Chemosphere Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Espanha País de publicação: Reino Unido