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Approximate total Fe content determined by Mössbauer spectrometry: Application to determine the correlation between gamma-ray-emitter activities and total content of Fe phases in soils of the Province of Buenos Aires, Argentina.
Montes, M L; Rivas, P C; Taylor, M A; Mercader, R C.
Afiliação
  • Montes ML; Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, IFLP-CONICET, Argentina. Electronic address: lmontes@fisica.unlp.edu.ar.
  • Rivas PC; Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, IFLP-CONICET, Argentina.
  • Taylor MA; Facultad de Ingeniería, Universidad Nacional de La Plata, IFLP-CONICET, Argentina.
  • Mercader RC; Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, IFLP-CONICET, Argentina.
J Environ Radioact ; 162-163: 113-117, 2016 Oct.
Article em En | MEDLINE | ID: mdl-27227563
Pearson correlation coefficients between 40K, 226Ra and 232Th activities and the total Fe phase fractions yielded by Mössbauer spectroscopy have been calculated for soils of the Province of Buenos Aires, Argentina. Total fractions of Fe phases have been obtained from the relative fractions reported in previous works weighted by the Fe soil content and the recoilless-fraction of each Fe phase. An approximate method based on the relationship between the Mössbauer spectral absorption area (obtained from the 57Fe Mössbauer data) and the total Fe concentration (determined by colorimetric methods, after microwave assisted acid digestion of soil samples) has been used for the first time to determine the Fe concentration in soils with an accuracy of 15%. Protocol to extend the method for unknown samples is also discussed. The determined new coefficients differ from those reported previously. A significant and positive correlation between the total fraction of Fe2+ and the 40K activity values has been obtained. This result validates the hypothesis put forward in a previous work, i.e., that illite captures the 40K existing in the soil. In addition, with the new approximation, the Pearson correlation coefficients for the other natural radionuclides give values that indicate that the methodology reported here is appropriate to study the correlations between the activity values with the total fractions of Fe phases.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solo / Poluentes Radioativos do Solo / Espectroscopia de Mossbauer / Ferro País/Região como assunto: America do sul / Argentina Idioma: En Revista: J Environ Radioact Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2016 Tipo de documento: Article País de publicação: Reino Unido
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solo / Poluentes Radioativos do Solo / Espectroscopia de Mossbauer / Ferro País/Região como assunto: America do sul / Argentina Idioma: En Revista: J Environ Radioact Assunto da revista: SAUDE AMBIENTAL Ano de publicação: 2016 Tipo de documento: Article País de publicação: Reino Unido