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Differential Infrared Spectroscopy in the Study of Parathion-Bentonite Complexes¹

ABSTRACT

Differential infrared spectroscopy was used to investigate parathion degradation in the adsorbed state. This technique enables observations of the 1,380–1,150 cm^–1 region, which is usually overlapping with the strong SiO absorption of bentonites. The appearance of the P=O absorption band upon heating clay-parathion complexes, in conjunction with other tests, confirmed that parathion degradation on bentonites occurs mainly via a rearrangement reaction.

¹ Contribution from the Agric. Res. Organ., The Volcani Center, Bet Dagan, Israel, 1977 series, no. 274-E; and the Dep. of Geology, The Hebrew Univ. of Jerusalem, Jerusalem, Israel.

² Senior Scientist, Division of Soil Physical Chemistry, Institute of Soils and Water, ARO, The Volcani Center, Bet Dagan; Senior Lecturer in Geochemistry, Dep. of Geology, The Hebrew Univ. of Jerusalem, Jerusalem; Scientist, Division of Soil Residues Chemistry, Institute of Soils and Water, ARO, The Volcani Center, Bet Dagan, Israel, respectively.

Received for publication February 6, 1978. Accepted for publication April 6, 1978.