Sulfentrazone Adsorbed on Micelle-Montmorillonite Complexes for Slow Release in Soil

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• 作者：Tamara Polubesova ; Shlomo Nir ; Onn Rabinovitz ; Mikhail Borisover ; and Baruch Rubin
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2003
• 出版时间：May 21, 2003
• 年：2003
• 卷：51
• 期：11
• 页码：3410 - 3414
• 全文大小：122K
• 年卷期：v.51,no.11(May 21, 2003)
• ISSN：1520-5118

文摘

Interactions of the herbicide sulfentrazone with the cationic surfactants octadecyltrimethylammonium(ODTMA), hexadecyltrimethylammonium (HDTMA), and benzyldimethylhexadecylammonium (BDMHDA) have been studied for the design of slow-release formulations based on sulfentrazone adsorbedon a micelle-montmorillonite complex. Adsorbed amounts of sulfentrazone on ODTMA- andBDMHDA-montmorillonite complexes were 99.2-99.8% of that added, and desorption of herbicidein water during 24 h was low. After 10 washings in funnels with soil, only 2.6% of herbicide wasreleased from ODTMA-montmorillonite formulations versus 100% release from the commercialformulation. The strong binding of sulfentrazone to micelles was confirmed by pH and spectroscopicmeasurements and was explained by the formation of ionic pairs between cationic surfactant andanionic herbicide. The ODTMA-clay and commercial formulations of sulfentrazone yield almostcomplete and 40% growth inhibition of green foxtail, respectively, at 700 g of active ingredient/ha.Hence, the slow release from micelle-clay formulations of sulfentrazone promotes its biological activityand reduces environmental contamination.Keywords: Surfactant; micelle; montmorillonite; sulfentrazone; adsorption; slow release