Can the pH-dependent adsorption of phenoxyalkanoic herbicides in soils be described with a single equation?

ABSTRACT: The six phenoxyalkanoic acid herbicides currently used in the European Union have similar molecular structures. Therefore, we assumed the soil components involved in the adsorption mechanisms of these herbicides to be identical. The values of the adsorption distribution coefficient K_d, obtained via batch experiments involving typical Polish Arenosol, Luvisol, and Chernozem profiles with a native pH of 4.2-7.7, were examined using Lasso regression, as well as adsorption on isolated fractions of humic substances, Al₂O₃, and goethite. The neutral forms of the herbicides were adsorbed on the surface of fulvic acids available to them, covering soil mesopores with a size of > 2.5 nm. The models revealed that fulvic acids had a lognormal-like distribution in soil

SUBMITTER: Paszko T 

PROVIDER: S-EPMC11602863 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature