Mechanisms of Adsorption of Phenoxyalkanoic Herbicides on Fulvic and Humic Acids.

ABSTRACT: Our recent study demonstrated that fulvic and humic acids are the major contributors to the adsorption of phenoxyalkanoic acid herbicides in soils. At very low pH, the neutral forms of these herbicides are bound directly to fulvic and humic acids, whereas at higher pH, their anionic forms are adsorbed mainly via bridges created by Al³⁺ species. The number of active sorption sites associated with Al³⁺ species complexed with fulvic acids is pH-dependent, whereas the number of corresponding sites in humic acids is pH-independent. Based on the results of the FTIR analysis, research into adsorption thermodynamics, and molecular modeling, an attempt was made in the present study to explain the adsorption mechanisms of six phenoxyalkanoic herbicides used currently in the Eur

SUBMITTER: Paszko T 

PROVIDER: S-EPMC11641278 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature