title: Combining experimental techniques with non-linear numerical models to assess the sorption of pesticides on soils.
abstract: The risk assessment of groundwater pollution by pesticides may be based on pesticide sorption and biodegradation kinetic parameters estimated with inverse modeling of datasets from either batch or continuous flow soil column experiments. In the present work, a chemical non-equilibrium and non-linear 2-site sorption model is incorporated into solute transport models to invert the datasets of batch and soil column experiments, and estimate the kinetic sorption parameters for two pesticides: N-phosphonomethyl glycine (glyphosate) and 2,4-dichlorophenoxy-acetic acid (2,4-D). When coupling the 2-site sorption model with the 2-region transport model, except of the kinetic sorption parameters, the soil column datasets enable us to estimate the mass-transfer coefficients associated with solute diffusion between mobile and immobile regions. In order to improve the reliability of models and kinetic parameter values, a stepwise strategy that combines batch and continuous flow tests with adequate true-to-the mechanism analytical of numerical models, and decouples the kinetics of purely reactive steps of sorption from physical mass-transfer processes is required.
authors: Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, Stadiou Street, Platani, 26504 Patras, Greece.
authors: Zoi
authors: Z
authors: Magga
authors: Dimitra N
authors: DN
authors: Tzovolou
authors: Maria A
authors: MA
authors: Theodoropoulou
authors: Christos D
authors: CD
authors: Tsakiroglou
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000032:analysis / Q000737:chemistry*; D000327:Adsorption; D001673:Biodegradation, Environmental; D004058:Diffusion; D004784:Environmental Monitoring; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D060587:Groundwater; D006540:Herbicides / Q000032:analysis / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D000097797:Glyphosate
chemical_list: D015084:2,4-Dichlorophenoxyacetic Acid; D005998:Glycine; D006540:Herbicides; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D000097797:Glyphosate