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Temporal Changes in Cadmium Speciation in Brazilian Soils Evaluated Using Cd L-III-Edge XANES and Chemical Fractionation

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Autor(es):
Colzato, Marina [1] ; Kamogawa, Marcos Y. [1] ; Carvalho, Hudson W. P. [2] ; Alleoni, Luis R. F. [1] ; Hesterberg, Dean [3]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil
[3] North Carolina State Univ, Dept Crop & Soil Sci, 101 Derieux Pl, Raleigh, NC 27695 - USA
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF ENVIRONMENTAL QUALITY; v. 46, n. 6, p. 1206-1214, NOV-DEC 2017.
Citações Web of Science: 3
Resumo

Chemical speciation of soil cadmium (Cd) dictates its mobility and potential toxicity in the environment. Our objective was to compare temporal changes in speciation of Cd(II) reacted with samples from six Brazilian soils having varying Cd(II) sorption capacities. Cadmium L-III-edge X-ray absorption near edge structure (XANES) analysis showed there were short-term changes in speciation after reaction with 4.45 mmol Cd kg(-1) for 0.5 and 6 h. Chemical fractionation evaluated changes in Cd extractability after reaction with 89 mmol Cd kg(-1) for up to 4 mo. The XANES spectral fits suggested that Cd(II) bound with organic matter was a dominant species in all samples, along with Cd(II) bound with iron and aluminum oxides or montmorillonite. In several samples, CdCl2 apparently precipitated from aqueous Cd(II) during drying. The XANES spectral fits typically showed <25% change in speciation between 0.5 and 6 h of reaction, and chemical fractionation showed significant (p<0.05) temporal changes in Cd extractability over time in two samples. Our results suggest that Cd(II) discharged into these soils, such as that occurring as a release into the environment, would bind with soil organic matter and oxide minerals or remain dissolved, with little change in speciation in the months following release. (AU)

Processo FAPESP: 11/23498-9 - Sistemas avançados de análises químicas em fluxo: aplicações nas áreas tecnológica, agronômica e ambiental
Beneficiário:Elias Ayres Guidetti Zagatto
Linha de fomento: Auxílio à Pesquisa - Temático