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

AUTOR(ES)

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

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2010

RESUMO

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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