The adsorption constant of 2,4-dichlorophenoxyacetic acid (2,4-D) was determined in 4 soils in which there were different organic carbon content and pH value in laboratory studies. Measured equilibrium isotherms for 2,4-D in the soils were of nonlinear Freundlich type. The average value of organic carbon adsorption constant of 2,4-D in soil was 239.6. Adsorption constant of 2,4-D was significantly correlated with the organic carbon content of the soils and was also effected by pH value in soils.
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