Adsorption of the herbicide terbuthylazine by a soil from the Jezreel Valley was investigated by thermo-IR-spectroscopy. The
adsorption took place mainly by the clay mineral montmorillonite. The adsorbed molecule was hydrogen bonded via the aniline
groups to water molecules which were coordinated to the exchangeable metallic cations. When the sample was thermally treated
at 115°C interlayer water was evolved, part of the herbicide decomposed and the other part became directly coordinated to
the exchangeable metallic cations. The decomposition product contained a CO group.