Química Nova (Jan 2010)

Adsorption of glyphosate in a forest soil: a study using Mössbauer and FT-IR spectroscopy

  • Luís Otávio de B. Benetoli,
  • Henrique de Santana,
  • Cristine E. A. Carneiro,
  • Dimas A. M. Zaia,
  • Ailton S. Ferreira,
  • Andrea Paesano Jr.,
  • Cássia Thaïs B. V. Zaia

DOI
https://doi.org/10.1590/S0100-40422010000400017
Journal volume & issue
Vol. 33, no. 4
pp. 855 – 859

Abstract

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We studied the adsorption of glyphosate (GPS) onto soil mineral particles, using FT-IR and Mössbauer spectroscopy. From IR measurements for samples collected under native vegetation of a forest reserve, bands at 1632 and 1407 cm-1 could be attributed to the interaction between the carboxylic group of GPS and structural Al3+ and Fe3+ on the surface of mineral particles; bands at 1075 and 1000 cm-1 were observed only for cultivated soil. Mössbauer spectra for these soils were definitely fitted using a broad central doublet in addition to the magnetic component. This multiple quadrupolar component may be attributed to all non-magnetic Fe3+ contributions, including that of the GPS/Fe3+ complex.

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