Behaviour of thiocarbamate herbicides in soils: Adsorption and volatilization

Adsorption and volatilization of cycloate, EPTC and vernolate applied to six types of soils were studied in the laboratory. Cycloate proved to be the most and EPTC the least adsorptive molecule in all systems examined, while the volatilization order of the compounds was the reverse EPTC>vernolate>cycloate. Neither the adsorption nor the volatilization of thiocarbamates was markedly affected by formulating agents. The adsorption isotherm of several systems did not obey the classical Freundlich equation. A reciprocal relationship which was found between the adsorption coefficients and the volatilization rates of thiocarbamates permits calculation of one of these properties if data on the other are available.