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Influence of the isomerism on the sorption of imazamethabenz-methyl by soil

Pinna, Maria Vittoria and Pusino, Alba (2013) Influence of the isomerism on the sorption of imazamethabenz-methyl by soil. Chemosphere, Vol. 91 (3), p. 265-268. ISSN 0045-6535. eISSN 1879-1298. Article.

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DOI: 10.1016/j.chemosphere.2012.11.023

Abstract

The sorption of meta and para isomers of the herbicide imazamethabenz-methyl, methyl 6-[(RS)-4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl]-m- or p-toluate, by three soils and soil organic matter, was studied. Sorption isotherms conformed to the Freundlich equation. It was found that pH was the main factor influencing the adsorption in all of the systems. The highest level of sorption was measured on soils with low pH and high organic carbon content. Moreover, at low pH value, the soil rich in smectite clays, favoured the sorption of meta rather than para isomer. The higher affinity of clay surfaces for the meta isomer of the herbicide is due to the stabilization of the meta protonated form by resonance. At all pH values, the sorption on soil organic matter did not differ between two isomers.

Item Type:Article
ID Code:8591
Status:Published
Refereed:Yes
Uncontrolled Keywords:Imazamethabenz-methyl, isomerism, soil sorption, clays, organic matter
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0045-6535
eISSN:1879-1298
Deposited On:04 Feb 2013 09:19

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