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

• Main Authors: 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
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2010-01-01
• Series: Química Nova
• Subjects: herbicides; metals; soil
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422010000400017

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.