ADSORPTION AND DESORPTION OF IMAZAPYR BY SOIL

Citation
A. Pusino et al., ADSORPTION AND DESORPTION OF IMAZAPYR BY SOIL, Journal of agricultural and food chemistry, 45(3), 1997, pp. 1012-1016
Citations number
23
Categorie Soggetti
Food Science & Tenology",Agriculture,"Chemistry Applied
ISSN journal
00218561
Volume
45
Issue
3
Year of publication
1997
Pages
1012 - 1016
Database
ISI
SICI code
0021-8561(1997)45:3<1012:AADOIB>2.0.ZU;2-P
Abstract
The adsorption and desorption of imazapyr, -[4,5-dihydro-4-methyl-4-(1 -methylethyl)-5-oxo-1H- imidazol-2-yl]-3-pyridinecarboxylic acid, by s ix soils were studied. Adsorption isotherms conformed to the Freundlic h equation. A multiple regression analysis indicated that K-f(ads) val ues were better correlated if cation exchange capacity and pH (r = 0.9 84) were simultaneously taken into account. The results show that the herbicide adsorption is strongly affected by the pH and the charge of the adsorbing component. The organic matter is effective in imazapyr r etention, but only at pH <5. Enhanced adsorption was observed in amorp hous iron oxide, most likely because of a ligand exchange process.