Adsorption and desorption kinetics of carbofuran in acid soils

Carbofuran adsorption and desorption were investigated in batch and stirred flow chamber (SFC) tests. The carbofuran adsorption capacity of the soils was found to be low and strongly dependent on their clay and organic carbon contents. Carbofuran sorption was due mainly (>80%) to fast adsorption...

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Bibliographic Details
Published in:Journal of hazardous materials 2011-06, Vol.190 (1), p.159-167
Main Authors: Bermúdez-Couso, Alipio, Fernández-Calviño, David, Pateiro-Moure, Miriam, Nóvoa-Muñoz, Juan Carlos, Simal-Gándara, Jesús, Arias-Estévez, Manuel
Format: Article
Language:English
Subjects:
acid soils
Acids
Adsorption
Applied sciences
Carbofuran
Carbofuran - chemistry
Carbofuran - isolation & purification
Carbon
Chemical engineering
Cholinesterase Inhibitors
clay
Clay (material)
clay fraction
Correlation
Desorption
Diffusion
Exact sciences and technology
Insecticides
Kinetics
Mathematical analysis
Pollution
Soil - chemistry
soil organic carbon
Soil Pollutants - chemistry
Soils
sorption isotherms
Stirred flow chamber
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Summary:Carbofuran adsorption and desorption were investigated in batch and stirred flow chamber (SFC) tests. The carbofuran adsorption capacity of the soils was found to be low and strongly dependent on their clay and organic carbon contents. Carbofuran sorption was due mainly (>80%) to fast adsorption processes governed by intraparticle diffusion. The adsorption kinetic constant for the pesticide ranged from 0.047 to 0.195 min −1 and was highly correlated with constant n in the Freundlich equation ( r = 0.965, P < 0.05). Batch tests showed carbofuran desorption to be highly variable and negatively correlated with eCEC and the clay content. The SFC tests showed that soil organic carbon (C) plays a key role in the irreversibility of carbofuran adsorption. Carbofuran desorption increased rapidly at C contents below 4%. The desorption kinetic constant for the compound (0.086–0.195 min −1) was generally higher than its adsorption kinetic constant; therefore, carbofuran is more rapidly desorbed than it is adsorbed in soil.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2011.03.021