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Adsorption and Desorption of Picloram, Trifluralin, and Paraquat by Ionic and Nonionic Exchange Resins

Published online by Cambridge University Press:  12 June 2017

H. G. McCall ,
R. W. Bovey ,
M. G. McCully  and
M. G. Merkle
H. G. McCall
Affiliation:
Range Sci., Texas A&M Univ.
R. W. Bovey
Affiliation:
Plant Sci. Res. Div., Agr. Res. Serv., U.S. Dep. of Agr.
M. G. McCully
Affiliation:
Dep. of Range Sci. and Soil and Crop Sci., Texas A&M Univ., College Station, Texas 77843
M. G. Merkle
Affiliation:
Dep. of Range Sci. and Soil and Crop Sci., Texas A&M Univ., College Station, Texas 77843
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Abstract

We investigated the forces involved in the adsorption and desorption of 4-amino-3,5-6-trichloropicolinic acid (picloram), 1,1-dimethyl-4,4′-bipyridinium ion (paraquat), and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) using cationic, anionic, and nonionic exchange resins. The anionic resin (Cl-form) adsorbed 375, 0.08, and 0.67 mg of picloram, paraquat, and trifluralin, respectively, per gram of oven-dry resin. The nonionic resin adsorbed 4.0, 0.34, and 10.0 mg of picloram, paraquat, and trifluralin, respectively, per gram of oven-dry resin, while the cationic resin (H-form) adsorbed 2.3, 226, and 0.17 mg of picloram, paraquat, and trifluralin, respectively. Other cationic resins (Na-form and Ca-form) performed similarly to the hydrogen form. Desorption studies indicated that picloram was adsorbed mainly in the anionic form by coulombic forces (electrostatic) and to a lesser degree by weak physical bonding (van der Waal's forces). Paraquat was adsorbed as a cation through coulombic forces. Trifluralin was mainly absorbed by physical bonds at sites on the resins where there were no coulombic forces.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 3 , May 1972 , pp. 250 - 255
Copyright
Copyright © Weed Science Society of America 

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References

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