Adsorption, percolation, and decomposition methods for forecasting the behavior of organic chemicals in soils.

Sorption, movement, and decomposition of trichlorphenoxyacetic acid (2,4,5-T) in two Berlin soils were investigated in field experiments in summer and winter time. Contemporary with simple laboratory methods, it was attempted to predict the behavior under field conditions. For this purpose, adsorption and desorption experiments were carried out and isotherms were calculated using the Freundlich equation. Second, percolation studies under saturated and unsaturated conditions were considered. Finally, the decomposition of 2,4,5-T in soil samples at different temperature was determined. A sorption experiment at the beginning of a test program for prediction the behavior from chemical compounds at least with four soil samples, a Chernozem-Ah, a Cambisol-Ap, a Podsol Ah, and a Pelosol-B, completed by decomposition experiments measuring the CO2-respiration, is proposed.