Azimsulfuron sorption--desorption on soil.
The sorption and desorption of the herbicide azimsulfuron, N-[[(4-dimethoxypyrimidin-2-yl)amino]carbonyl]1-methyl-4-(2-methyl-2H-tetrazole-5-yl)1H-pyrazole-5-sulfonamide, were studied using five soils. Sorption isotherms conformed to the Freundlich equation. It was found that pH is the main factor influencing the sorption and that the sorption on soils was negatively correlated with pH. The highest level of sorption was measured on soils with low pH and high organic carbon content. Moreover, inorganic soil colloids, for example, smectite clay minerals and iron oxides, contributed to the sorption of azimsulfuron. Desorption was hysteretic on soils with high organic and inorganic colloid contents.
Pusino
Alba
A
Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agro-Alimentari, Università di Sassari, Viale Italia 39, 07100 Sassari, Italy. pusino@uniss.it
Pinna
M Vittoria
MV
Gessa
Carlo
C
D002244:Carbon / Q000032:analysis*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011720:Pyrazoles / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013449:Sulfonamides / Q000737:chemistry*
D006540:Herbicides; D011720:Pyrazoles; D012987:Soil; D013449:Sulfonamides; D002244:Carbon; C487586:azimsulfuron