Sorption studies of 2,4-D on selected soils

Adsorption/desorption characteristics of the herbicide 2,4-D on various types of soils were investigated. Batch equilibrium techniques were used in the laboratory experiments. Data were fitted to the linear and Freundlich sorption equations. K and K-f values ranged between 0.32-1.89 L-1 mg and 2.6 x 10(-3) - 7.4 mg kg-(1), respectively. Results showed that both for linear and Freundlich adsorption equations, for all soils, K and K-f were correlated to the organic matter content (r = 0.87 and r = 0.66, respectively). Adsorption was also positively correlated with silt and clay content of soils (r = 0.53) and negatively correlated with sand content.