Sulfosulfuron incorporated in micelles adsorbed on montmorillonite for slow release formulations

Yael G. Mishael, Tomas Undabeytia, Onn Rabinovitz, Baruch Rubin, Shlomo Nir*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Slow release formulations of the anionic herbicide sulfosulfuron (SFS) were prepared by incorporating it in micelles of an organic cation octadecyltrimethylammonium, which adsorb on the clay-mineral montmorillonite. The fraction of SFS adsorbed on the micelle-clay complex reached 98%, whereas for monomer-clay complexes, its adsorption was insignificant. Fluorescence studies showed surface contact between the micelles and the clay surface. The rate of SFS release from the micelle-clay formulations in aqueous suspensions was slow (<1%, 72 h). Spraying SFS formulations on a thin soil layer in a funnel, followed by irrigations (50 mm), resulted in complete elution of SFS from the commercial formulation (dispersible granular) versus 4% from the micelle-clay formulation. A plant bioassay in Rehovot soil showed that these respective formulations yielded 23 and 65% of shoot growth inhibition of foxtail. Consequently, the slow release micelle-clay formulations of SFS yield significantly reduced leaching and enhanced biological activity, thus providing environmental and agricultural advantages.

Original languageAmerican English
Pages (from-to)2253-2259
Number of pages7
JournalJournal of Agricultural and Food Chemistry
Issue number8
StatePublished - 9 Apr 2003


  • Bioassay
  • Fluorescence
  • Micelles
  • Montmorillonite
  • Octadecyltrimethylammonium
  • Slow release
  • Soil column
  • Sulfosulfuron


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