Evaluation of the Sorption Process for Imidacloprid and Diuron in Eight Agricultural Soils from Southern Europe Using Various Kinetic Models

Kinetic studies are of great concern for understanding the processes and parameters involved in the sorption of pollutants by soils. Sorption kinetics of imidacloprid and diuron in eight soils of different characteristics, with very low organic carbon content were investigated. Pseudosecond-order ki...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2008-07, Vol.56 (13), p.5266-5272
Main Authors: Fernández-Bayo, J. D, Nogales, R, Romero, E
Format: Article
Language:English
Subjects:
Adsorption
agricultural soils
Biological and medical sciences
Chromatography, High Pressure Liquid
diuron
Diuron - analysis
Environmental Chemistry
Environmental Pollutants - analysis
Food industries
Fundamental and applied biological sciences. Psychology
imidacloprid
Imidazoles - analysis
Kinetics
modeling
Models, Biological
Models, Theoretical
Neonicotinoids
Nitro Compounds - analysis
organic matter
pesticide residues
Pesticides - analysis
polluted soils
Soil
Soil - analysis
soil pollution
sorption
sorption kinetic
Spain
surface area
texture
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Summary:Kinetic studies are of great concern for understanding the processes and parameters involved in the sorption of pollutants by soils. Sorption kinetics of imidacloprid and diuron in eight soils of different characteristics, with very low organic carbon content were investigated. Pseudosecond-order kinetic reactions closely correlate with the experimental kinetic (R 2 > 0.98) in all soils. The sorbed amount of diuron was higher than that for imidacloprid. The low OC content of these soils correlated neither with the sorbed amount nor with the kinetic parameters for both pesticides. Imidacloprid sorption was correlated with silt and sand content and cation exchange capacity (CEC); meanwhile for diuron, no correlation was found. Thus, sorption kinetics take place throughout different mechanisms related mainly to the chemical character of the pesticides. Sorption kinetic parameters determined using three of the four models selected (pseudosecond-order kinetic reactions, Elovich equation, and Weber−Morris models) have been shown to be worthy to distinguish the process controlling the sorption kinetic of both pesticides.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf8004349