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Chlorsulfuron Dissociation and Adsorption on Selected Adsorbents and Soils

Published online by Cambridge University Press:  12 June 2017

Patrick J. Shea
Patrick J. Shea*
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
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Abstract

The dissociation constant for chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl] benzenesulfonamide} in aqueous solution measured by spectrophotometric titration is 3.58 ± 0.05. Chlorsulfuron was more strongly adsorbed on IRA-400-Cl strong anion exchange resin than on IR-4B-OH weak anion exchange resin or Al2O3 anionotropic adsorbent. Hydrogen bonding was probably responsible for the adsorption observed on IR-120-Na(H) cation exchange resin. No chlorsulfuron was adsorbed on Al2O3 cationotropic absorbent, technical montmorillonite, illite, or kaolinite. Adsorption did occur on organic matter derived from a histosol. Chlorsulfuron was strongly adsorbed on activated charcoal but had little affinity for α-cellulose. Adsorption onto hydrophobic polymeric XAD-2 adsorbent at pH 5.2 was not significant for chlorsulfuron concentrations below 30 μM. No significant adsorption occurred on a variety of mineral soils low in organic matter. Adsorption on a Sharpsburg silty clay loam was inversely related to solution pH. Hydrogen bonding and charge transfer bonds were postulated as the major mechanisms responsible for chlorsulfuron adsorption in soil.

Keywords

pKAionizationspectrophotometrysulfonylurea
Type
Soil, Air, and Water
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 474 - 478
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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