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Infrared and X-ray Study of Parathion-Montmorillonite Sorption Complexes¹

ABSTRACT

Infrared spectra indicate that parathion sorbed by montmorillonite coordinates through water molecules to the metallic cations in the interlayer space of the clay. By dehydrating the clay-parathion complexes, parathion becomes directly coordinated with the monovalent cations. The main interaction is through the oxygen atoms of the nitrogroup, although interactions through the P=S group were also observed, especially for complexes saturated with polyvalent cations.

¹ Contribution from the Agric. Res. Organization, The Volcani Center, Bet Dagan (1975 Series, No. 120-E), and the Dep. of Geology, The Hebrew Univ. of Jerusalem, Israel. This research was financed in part by a grant made by the USDA under Public Law 480.

² Scientist, Division of Soil Residues Chemistry, Inst. of Soils and Water, Agric. Res. Organ., The Volcani Center, Bet Dragan, Israel.

³ Senior Lecturer in Geochemistry, Dep. of Geology, The Hebrew Univ. of Jerusalem, Israel.

Received for publication April 2, 1975. Accepted for publication September 4, 1975.