Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 50, Issue 22, Pages 6434-6439Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf020501z
Keywords
hexaconazole; triadimefon; penconazole; adsorption; desorption; organic carbon; humic acid
Ask authors/readers for more resources
Adsorption-desorption of triazole fungicides, hexaconazole [2-(2,4-dichlorophenyl)-1-(1 H-1,2,4,-triazol-1 -yl) hexan-2-ol], triadimefon [1 -(4-chlorophenoxy)-3,3-dimethyl-1 -(1 H-1,2,4-triazol-1 -yl) butan-2-one], and penconazole[1-(2,4-dichloro-beta-propyl phenethyl)-1H-1,2,4-triazole] was studied in five Indian soils using batch method. The adsorption isotherms fitted very well to the Freundlich equation. Adsorption of various triazole fungicides increased in this order: triadimefon > hexaconazole > penconazole. The product of the Freundlich adsorption constants, K-1(1/n), showed good correlation with the soil organic carbon (OC) content, suggesting that soil OC is the main controlling factor for triazoles adsorption. Clay and slit content of the soil also affected the adsorption constants, Adsorption of hexaconazole and triadimefon was nearly reversible in two low OC soils (soil 3, soil 5) where 90-100% of the sorbed fungicides was released in a single washing step. Otherwise, desorption of triazole fungicides showed hysteresis, and 30-60% of the triazole fungicides were retained by the soil after single washing. IR spectra showed that H-bonds and charge-transfer bonds between humic acid and fungicides probably operated as mechanisms of adsorption.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available