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Polymeric Resins Adsorb and Release Oryzalin in Response to pH

Published online by Cambridge University Press:  20 January 2017

Glenn B. Fain*
Affiliation:
USDA-ARS, Southern Horticultural Laboratory, P.O. Box 287 Poplarville, MS 39470
Timothy L. Grey
Affiliation:
Department of Soil and Crop Science, The University of Georgia, Plant Science Building, 115 Coastal Way Tifton, GA 31794
Glenn R. Wehtje
Affiliation:
Agronomy and Soils Department, 201 Funchess Hall Auburn University, AL 36849
Charles H. Gilliam
Affiliation:
Department of Horticulture, 101 Funchess Hall Auburn University, AL 36849
Jason A. Osborne
Affiliation:
Department of Statistics, North Carolina State University, 16 Patterson Hall Campus Box 8203 Raleigh, NC 27695
*
Corresponding author's E-mail: gfain@ars.usda.gov

Abstract

Two polymeric anion-exchange resins and one sorbent resin were evaluated for their propensity to adsorb, and subsequently desorb, oryzalin. The intent was to determine whether these resins could adsorb and subsequently release oryzalin in a manner that would render these resins as an option for slow-release herbicide delivery. The dinitroaniline herbicide oryzalin is weakly acidic with a dissociation constant (pK a) of 8.6. An additional objective was to determine whether altering the pH between sorption and desorption would enhance the desired performance. Maximum oryzalin sorption by the two anion-exchange resins was between 127 and 132 mg g−1 ai. The sorbent resin was adsorbed at a maximum concentration of 191 mg g−1 ai. Maximum sorption occurred with the pH 10 solutions with all resins. Average oryzalin desorption by the anion-exchange resin was between 0.12 and 3.84 mg g−1 per desorption event. Maximum desorption occurred at pH 6.0. Results reveal that the resins evaluated may have merit for slow-release herbicide delivery.

Information

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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