DESORPTION OF SOME HERBICIDES FROM MONTMORILLONITE AND PEAT

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Abstract
Desorption of monuron, atrazine, and prometryne from montmorillonite was tested immediately (i.e., after a 24-hr adsorption period) and following drying. Monuron and atrazine were reversibly adsorbed in both cases. Immediately after desorption, less prometryne was desorbed than predicted, but after drying, more was desorbed than predicted. With a peat preparation, monuron and atrazine were reversibly adsorbed if desorption was carried out immediately after adsorption, but, after drying to constant weight at 62% RH, desorption was not completely reversible. Sorption of prometryne and linuron by the peat was not completely reversible whether desorption was attempted immediately after adsorption or after drying. Desorption was reduced by the drying step with linuron, but not with prometryne. It is considered that degradation of the herbicides could not account for the irreversibility.