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Sorption of primisulfuron on soil, and inorganic and organic soil colloids

Pusino, Alba and Petretto, Salvatore Gavino Mario and Gessa, Carlo Emanuele (2004) Sorption of primisulfuron on soil, and inorganic and organic soil colloids. European Journal of Soil Science, Vol. 55 (1), p. 175-182. eISSN 1365-2389. Article.

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DOI: 10.1046/j.1365-2389.2003.00580.x

Abstract

Inorganic and organic soil colloids are responsible for the sorption of many pesticides. We studied the sorption of the herbicide primisulfuron [methyl 2 N-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoate] on Fe3+-, Al3+-, Ca2+- and Na+-exchanged montmorillonite, soil organic matter (H+- and Ca2+-saturated), amorphous iron oxide, and three soils in aqueous media. The sorption on soils was negatively correlated with pH. Ca2+- and Na+-exchanged montmorillonites are ineffective in the sorption of primisulfuron. The sorption on Fe3+- and Al3+-exchanged montmorillonite is rapid and follows the Freundlich equation. Fourier transform infrared (FT-IR) and X-ray powder diffraction studies of the Fe3+- and Al3+-montmorillonite samples after the interaction with primisulfuron in chloroform solution suggest that primisulfuron is adsorbed and degraded in the interlayer. Humic acid is more effective in the sorption than is Ca humate, suggesting that the pH of the suspension (3.5 for humic acid and 6.0 for Ca humate) has a strong influence on the sorption of primisulfuron. Experiments on amorphous iron oxide indicate similar pH dependence. Infrared spectra indicate that the protonation of the pyrimidine nitrogen moiety of herbicide and subsequent hydrogen bonding with the surface hydroxyls of Fe oxide is the mechanism acting in the primisulfuron sorption.

Item Type:Article
ID Code:2516
Status:Published
Refereed:Yes
Uncontrolled Keywords:Pesticide, herbicide
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Blackwell / Wiley
eISSN:1365-2389
Copyright Holders:© 2003 Blackwell
Deposited On:18 Aug 2009 10:07

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