Influence of soil properties on the adsorption-desorption of sulcotrione and its hydrolysis metabolites on various soils.
The retention process of sulcotrione and its two hydrolysis products, 1,3-cyclohexanedione (CHD) and 2-chloro-4-methylsulfonylbenzoic acid (CMBA), were studied in four different soils (Belgium, Landes, Perpignan, and Martinique) under laboratory conditions. Adsorption isotherms were well fitted by a Freundlich relationship. The values of K(fa) ranged from 0.4 to 27.0, and the most adsorbed compound was CHD regardless the soil type. Sulcotrione and CMBA exhibited similar retention behaviors. According to adsorption and desorption results, sulcotrione presents a moderate affinity with soil components; however, its leaching capacity needs to be carefully assessed. Clay content seemed to be the most important factor influencing the adsorption capacity of each compound, whereas organic matter and pH had little influence. The soils were classified according to their adsorption capacity in the following decreasing order: Martinique, Belgium, Landes, Perpignan.
Chaabane
Hanene
H
Laboratoire de Chimie des Biomolécules et de l'Environnement, Centre de Phytopharmacie, Université de Perpignan, 52 avenue Paul Alduy, 66860 Perpignan, France.
Cooper
Jean-François
JF
Azouzi
Lamia
L
Coste
Camilla-Michel
CM
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D000077215:Clay; D003512:Cyclohexanones / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D008698:Mesylates / Q000737:chemistry*; D012987:Soil / Q000032:analysis*
D000538:Aluminum Silicates; D003512:Cyclohexanones; D006540:Herbicides; D008698:Mesylates; D012987:Soil; C079906:sulcotrione; D000077215:Clay