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Sorption behaviour of metolachlor, isoproturon, and terbuthylazine in soils

: Singh, N.; Kloeppel, H.; Klein, W.


Journal of environmental science and health. Part B, pesticides, food contaminants, and agricultural wastes 36 (2001), No.4, pp.397-407
ISSN: 0360-1234
Journal Article
Fraunhofer IUCT ( IME) ()
metolachlor; Isoproturon; terbuthylazine; adsorption; desorption; organic carbon

The sorption-desorption of metolachlor [2-chloro-N-(ethyl-6-methyl phenyl)-N-(2-methoxy-1-methyl ethyl) acetamide], isoproturon [3-(4-isopropyl phenyl)-1,1-dimethyl urea] and terbuthylazine [N6 -tert butyl-6-chloro-N4 -ethyl-1,3,5-triazine-2,4-diamine] herbicides was studied in two German soils at 1 : 10 soil to. water ratio by batch method. Equilibrium of herbicides between soil and water (0.01 M CaCl2) was attained in 2 h. Sorption data fitted very well to Freundlich equation, represented by very high correlation coefficient (r exp 2 > 0.934). Comparison of Freundlich K values indicated that sorption of all the three herbicides was most pronounced in soil having higher organic carbon content. K ind oc values were as expected nearly identical for each herbicide in the two soils. The Freundlich constant (1/n) was about 1 for metolachlor and less than 1 for terbuthylazine and isoproturon indicating a L-type of sorption isotherms. Desorption of all the three herbicides showed hysteresis. Nearly equal amounts of metolachlor, isoproturon and terbuthylazine were desorbed from both soils. There was a good correlation between K ind oc and solubility.