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Adsorption of Imazaquin and Imazethapyr on Soils, Sediments, and Selected Adsorbents

Published online by Cambridge University Press:  12 June 2017

Mark M. Loux ,
Rex A. Liebl  and
Fred W. Slife
Mark M. Loux
Affiliation:
Dep. Agron., Univ. Illinois, Urbana, IL 61801
Rex A. Liebl
Affiliation:
Dep. Agron., Univ. Illinois, Urbana, IL 61801
Fred W. Slife
Affiliation:
Dep. Agron., Univ. Illinois, Urbana, IL 61801
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Abstract

Adsorption of imazaquin and imazethapyr on soils, sediments, clays, and ion exchange resins was studied. Multivariate regression analysis of Freundlich K values and soil and sediment properties yielded a model for imazaquin adsorption which included soil pH, organic carbon, and clay as significant independent variables. Clay content and pH were significant independent variables for the imazethapyr adsorption model. Adsorption of imazaquin and imazethapyr was greater at pH below 6 than at a higher pH. Adsorption of both herbicides on Ca- and H/Al-kaolinite and Ca-montmorillonite was low, but increased on H/Al-montmorillonite. The results of adsorption studies with ion exchange resins indicated that binding of protonated herbicide at low pH could be due to physical forces, hydrogen bonding, or cationic binding. At soil pH levels above the pKa's of imazaquin and imazethapyr, ionic bonding of herbicide anions with positively charged soil components could also occur.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidImidazolinone herbicidesherbicide adsorptionherbicide binding
Type
Soil, Air, and Water
Information
Weed Science , Volume 37 , Issue 5 , September 1989 , pp. 712 - 718
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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