The Adsorption and Degradation of 2, 4-D Affected by Soil Organic Carbon and Clay

More has yet to be indicated on the adsorption and degradation processes, determining herbicides recycling in the environment. The sorption and degradation of 2, 4-D, affected by organic carbon (1.92–2.81%), soil clay (20–30%) and pH of the citrus orchards of Mazandaran province, Iran was investigated using HPLC equipped with UV detector for the identification and quantification of soil 2, 4-D. The adsorption (k d ) and degradation (K deg ) coefficients were determined using Freundlich and the first-degree kinetic equations. Gardens C (2.45 mL g −1 ), and B (0.3 mL g −1 ), with the highest (8.2 g day −1 ) and least (2.7 g day −1 ) degradation coefficients, had the highest and lowest K d values. K d variations with pH indicated higher adsorption of 2, 4-D in acidic pH. Due to the high presence of functional groups and soil biological activities, organic carbon affected the adsorption and degradation rates more effectively, which is of economic and environmental significance.