Sodium dodecyl sulphate-enhanced desorption of atrazine: Effect of surfactant concentration and of organic matter content of soils

A study was made of the adsorption–desorption of atrazine in aqueous medium in five soils with organic matter (OM) contents in the range 1.4–10.3% and also of the desorption of the herbicide in aqueous solutions of the anionic surfactant sodium dodecyl sulphate (SDS) at critical micelle concentratio...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2000-10, Vol.41 (8), p.1301-1305
Main Authors: Sanchez-Camazano, M, Sanchez-Martin, M.J, Rodriguez-Cruz, M.S
Format: Article
Language:English
Subjects:
Adsorption
Adsorption–desorption
Agronomy. Soil science and plant productions
Applied sciences
Atrazine
Atrazine - pharmacokinetics
Biological and medical sciences
Decontamination. Miscellaneous
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Groundwaters
Herbicides - pharmacokinetics
Natural water pollution
Organic Chemicals - metabolism
Pollution
Pollution, environment geology
Sodium dodecyl sulphate
Soil
Soil and sediments pollution
Soil and water pollution
Soil Pollutants - pharmacokinetics
Soil science
Surface-Active Agents
Water treatment and pollution
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Summary:A study was made of the adsorption–desorption of atrazine in aqueous medium in five soils with organic matter (OM) contents in the range 1.4–10.3% and also of the desorption of the herbicide in aqueous solutions of the anionic surfactant sodium dodecyl sulphate (SDS) at critical micelle concentrations (cmc) of 0.75, 1.50, 5 and 10. The adsorption and desorption isotherms in water together with the desorption isotherms in SDS solutions with concentrations of 0.75 and 1.50 cmc fit the Freundlich adsorption equation. All the desorption isotherms displayed hysteresis. The increase or reduction in hysteresis of the desorption isotherms in SDS solutions with respect to those of desorption in water depend on the SDS concentration and on the OM content of the soils. Below the cmc, SDS only increases the desorption of atrazine in the soil with the highest OM content (10.3%). However, above the cmc (5 and 10 cmc) the desorption of atrazine increases in all soils, the efficiency of desorption increasing with the OM content of the soils.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(99)00503-2