Evaluating equilibrium and non-equilibrium transport of bromide and isoproturon in disturbed and undisturbed soil columns

Autor: Jirka Simunek, Sylvie Dousset, Mathieu Thevenot, Francis Andreux, Valérie Pot
Přispěvatelé: Biogéosciences [UMR 6282] [Dijon] (BGS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Microbiologie du Sol et de l'Environnement (MSE), Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB), Environnement et Grandes Cultures (EGC), AgroParisTech-Institut National de la Recherche Agronomique (INRA), Department of Environmental Sciences, University of California [Los Angeles] (UCLA), University of California-University of California, Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Biogéosciences [Dijon] ( BGS ), Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique ( CNRS ), Microbiologie du Sol et de l'Environnement ( MSE ), Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ), Environnement et Grandes Cultures ( EGC ), AgroParisTech-Institut National de la Recherche Agronomique ( INRA ), University of California at Los Angeles [Los Angeles] ( UCLA )
Jazyk: angličtina
Rok vydání: 2007
Předmět:
Bromides
[SDE.MCG]Environmental Sciences/Global Changes
Soil science
010501 environmental sciences
01 natural sciences
[ SDE.MCG.CPE ] Environmental Sciences/Global Changes/domain_sde.mcg.cpe
chemistry.chemical_compound
Bromide
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
TRACER
[ SDE.MCG.SIC ] Environmental Sciences/Global Changes/domain_sde.mcg.sic
[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces
environment
Water Movements
Soil Pollutants
Environmental Chemistry
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
0105 earth and related environmental sciences
Water Science and Technology
[SDE.MCG.SIC]Environmental Sciences/Global Changes/domain_sde.mcg.sic
Herbicides
Phenylurea Compounds
Breakthrough curves
Modeling
Sorption
04 agricultural and veterinary sciences
[ SDU.STU.GC ] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
[SDE.MCG.CPE]Environmental Sciences/Global Changes/domain_sde.mcg.cpe
Bulk density
6. Clean water
Tillage
[ SDE.MCG ] Environmental Sciences/Global Changes
Permeability (earth sciences)
Models
Chemical
chemistry
Loam
Soil water
040103 agronomy & agriculture
0401 agriculture
forestry
and fisheries
Adsorption
Isoproturon
Geology
HYDRUS-1D
Zdroj: Journal of Contaminant Hydrology
Journal of Contaminant Hydrology, Elsevier, 2007, 94 (3-4), pp.261-276. ⟨10.1016/j.jconhyd.2007.07.002⟩
Journal of Contaminant Hydrology, Elsevier, 2007, 94 (3-4), pp.261-276. 〈10.1016/j.jconhyd.2007.07.002〉
ISSN: 0169-7722
DOI: 10.1016/j.jconhyd.2007.07.002⟩
Popis: 19 pages; International audience; In this study, displacement experiments of isoproturon were conducted in disturbed and undisturbed columns of a silty clay loam soil under similar rainfall intensities. Solute transport occurred under saturated conditions in the undisturbed soil and under unsaturated conditions in the sieved soil because of a greater bulk density of the compacted undisturbed soil compared to the sieved soil. The objective of this work was to determine transport characteristics of isoproturon relative to bromide tracer. Triplicate column experiments were performed with sieved (structure partially destroyed to simulate conventional tillage) and undisturbed (structure preserved) soils. Bromide experimental breakthrough curves were analyzed using convective-dispersive and dual-permeability (DP) models (HYDRUS-1D). Isoproturon breakthrough curves (BTCs) were analyzed using the DP model that considered either chemical equilibrium or non-equilibrium transport. The DP model described the bromide elution curves of the sieved soil columns well, whereas it overestimated the tailing of the bromide BTCs of the undisturbed soil columns. A higher degree of physical non-equilibrium was found in the undisturbed soil, where 56% of total water was contained in the slow-flow matrix, compared to 26% in the sieved soil. Isoproturon BTCs were best described in both sieved and undisturbed soil columns using the DP model combined with the chemical non-equilibrium. Higher degradation rates were obtained in the transport experiments than in batch studies, for both soils. This was likely caused by hysteresis in sorption of isoproturon. However, it cannot be ruled out that higher degradation rates were due, at least in part, to the adopted first-order model. Results showed that for similar rainfall intensity, physical and chemical non-equilibrium were greater in the saturated undisturbed soil than in the unsaturated sieved soil. Results also suggested faster transport of isoproturon in the undisturbed soil due to higher preferential flow and lower fraction of equilibrium sorption sites.
Databáze: OpenAIRE
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