Photostabilization of the herbicide bensulfuron-methyl by using organoclays.
Photostable formulations of the herbicide bensulfuron-methyl [BSM, 2-(4,6-dimethoxypyrimidin-2-carbamoylsulfamoyl)-o-toluic acid methyl ester] were achieved by adsorbing it on clays or on clays pre-adsorbed with the organic cation malachite green (MG). Fourier-transform infra-red (FTIR) spectra showed the existence of strong interactions between the pre-adsorbed MG and the herbicide. The photostabilization of BSM obtained with clay-MG was mainly due to pacification of clay surface by MG and a deactivation mechanism via energy transfer between the two organic molecules adsorbed on the surface of the clay.
Si
Youbin
Y
Department of Plant Protection, Anhui Agricultural University, Hefei 230036, China. youbinsi@21cn.com
Zhou
Jing
J
Chen
Huaiman
H
Zhou
Dongmei
D
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D007700:Kinetics; D008027:Light; D012394:Rosaniline Dyes; D017550:Spectroscopy, Fourier Transform Infrared; D013453:Sulfonylurea Compounds / Q000737:chemistry*
D000538:Aluminum Silicates; D012394:Rosaniline Dyes; D013453:Sulfonylurea Compounds; C005095:malachite green; C071475:methyl bensulfuron; D000077215:Clay