Retention of pesticides in soil columns modified in situ and ex situ with a cationic surfactant

A study of the effect of a clayey soil modified in situ and ex situ with the cationic surfactant octadecyltrimethylammonium bromide (ODTMA), on the retention of linuron, atrazine and metalaxyl was carried out. Leaching of these compounds was studied in columns of a natural clayey soil and the same c...

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Bibliographic Details
Published in:The Science of the total environment 2007-05, Vol.378 (1), p.104-108
Main Authors: Rodríguez-Cruz, María Sonia, Sánchez-Martín, Maria Jesús, Andrades, María Soledad, Sánchez-Camazano, María
Format: Article
Language:English
Subjects:
Adsorption
Alanine - analogs & derivatives
Alanine - analysis
Alanine - chemistry
Alkanes
Atrazine - analysis
Atrazine - chemistry
Barriers
Bentonite
Cationic surfactant
Cations
Hydrophobic and Hydrophilic Interactions
Immobilization
Linuron - analysis
Linuron - chemistry
Pesticides
Pesticides - analysis
Pesticides - chemistry
Quaternary Ammonium Compounds
Soil Pollutants - chemistry
Soils
Surface-Active Agents
Water Pollution - prevention & control
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Summary:A study of the effect of a clayey soil modified in situ and ex situ with the cationic surfactant octadecyltrimethylammonium bromide (ODTMA), on the retention of linuron, atrazine and metalaxyl was carried out. Leaching of these compounds was studied in columns of a natural clayey soil and the same clayey soil modified by direct injection of the surfactant in situ, and in columns of a natural sandy soil and the same sandy soil modified by intercalation of a barrier of the clayey soil saturated ex situ with the surfactant. Breakthrough curves indicated the total immobilization of linuron in modified soils and a decrease in the leaching kinetics of atrazine and metalaxyl compared to what was obtained in the natural soil. The results indicate the use of the clayey soil modified in situ or ex situ with the surfactant ODTMA could be of interest in the immobilization of pesticides of different hydrophobicities.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2007.01.021