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Surfactant Effects on Picloram Adsorption by Soils

Published online by Cambridge University Press:  12 June 2017

J. D. Gaynor  and
V. V. Volk
J. D. Gaynor
Affiliation:
Research Station, Agric. Canada, Harrow, Ont. Dep. of Soil Sci., Oregon State Univ., Corvallis, OR 97331
V. V. Volk
Affiliation:
Dep. of Soil Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

The effects of soil organic matter, clay, extractable Al, cation exchange capacity, and pH on the adsorption of picloram (4-amino-3,5,6-trichloropicolinic acid) from aqueous and surfactant solutions were investigated. Linear adsorption isotherms for the soils were obtained with the Freundlich equation. Of the five soil properties investigated, Freundlich K values correlated with extractable Al and clay content. Picloram adsorption from aqueous solutions and from the non-ionic and anionic surfactant solutions was greater on the soils at pH 5 than at pH 7. The anionic surfactant competed with picloram for adsorption sites on the soils at pH 5. Picloram adsorption from solutions containing 0.1 and 1% cationic surfactant was greater than that from aqeuous and anionic and nonionic surfactant solutions. Picloram adsorption from the 10% cationic surfactant solution was similar on soils with pH 5 and 7 and increased with decreased organic matter content.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 6 , November 1976 , pp. 549 - 552
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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