Soil column experiments used as a means to assess transport,sorption, and biodegradation of pesticides in groundwater |
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| Authors: | Zoi Magga Dimitra N. Tzovolou Maria A. Theodoropoulou Theodora Dalkarani Konstantinos Pikios Christos D. Tsakiroglou |
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| Affiliation: | 1. Foundation for Research and Technology Hellas-Institute of Chemical Engineering and High Temperature Chemical Processes , Patras , Greece;2. Department of Chemistry , University of Patras , Patras , Greece;3. Department of Mechanical Engineering , Technological Educational Institute of Patras , Patras , Greece;4. Foundation for Research and Technology Hellas-Institute of Chemical Engineering and High Temperature Chemical Processes , Patras , Greece |
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| Abstract: | Soil column experiments are used to investigate the fate of three pesticides of high, intermediate, and low solubility in groundwater: N- phosphonomethyl glycine (glyphosate); O,O-diethyl-S-[(ethylthio)methyl]phosphorodithioate (phorate); (2,4-dichlorophenoxy)acetic acid (2,4-D). Feed solutions are prepared by adding each pesticide (100 mg/L glyphosate, 50 μ g/L phorate, 50 mg/L 2,4-D) along with conservative tracer, KBr, in synthetic groundwater. The concentration of the pesticides in effluents is detected by ion chromatography (glyphosate, 2,4-D) and GC-FID (phorate). The Br? breakthrough curves are employed to estimate the dispersion coefficient and mean pore velocity in each column. Solute transport and reactive models accounting for equilibrium/non-equilibrium sorption and biodegradation are coupled with inverse modeling numerical codes to estimate the kinetic parameters for all pesticides. |
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| Keywords: | Groundwater soil column pesticide dispersion sorption biodegradation parameter estimation |
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