Study On Bensulfuron-methyl Adsorption On Soils, Fe & Al Oxides

With the wild use of sulfonylurea herbicides, the scientists paid more attention to their environmental behaviors gradually. An adsorption study on bensulfuron-methyl (BSM) on three synthsized metal oxides and two variable charge soils, and the effects of pH, metal ion Zn2+ on tested samples, have been carried out. The characteristics of adsorption kinetics have been investigated using the static, stirred and vortex batch techniques for GZ-soil (Guangzhou Soil), HN-soil (Hunan Soil) and Al oxide. At the same time, the morphologys and characteristics of the oxides and the surface adsorbed BSM were characterized with the techniques of FT-IR, XRD, TG At the same time, the BSM was analyzed with HPLC. The results showed:The forms of isotherms of BSM adsorption by soils and oxides were two types: One was that the magnitude of BSM adsorption increased rapidly as the concentration of BSM increased, the other was that the magnitude of BSM adsorption increased slowly with the increase concentration of BSM, and at last their equilibriums were reached. The data of the BSM adsorption by soils and oxides were discribed with the Langmuir Freundlich terkim equations. Compared with these equations, the Freundlich isotherm equation was the optional one. The other models in point were Langmuir terkim equations. The magnitude of BSM adsorption is as follows: hematite