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Primisulfuron and Rimsulfuron Degradation in Aqueous Solution and Adsorption in Six Colorado Soils

Published online by Cambridge University Press:  12 June 2017

Alberto Vicari ,
Robert L. Zimdahl ,
Brian K. Cranmer  and
Giovanni Dinelli
Alberto Vicari
Affiliation:
Dep. Agron., University of Bologna, Via F. Re 6-8 40126, Bologna, Italy
Robert L. Zimdahl
Affiliation:
Weed Res. Lab, Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Brian K. Cranmer
Affiliation:
Weed Res. Lab, Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Giovanni Dinelli
Affiliation:
Dep. Agron., Via F. Re 6-8, 40126, Bologna, Italy
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Abstract

Hydrolysis and adsorption of the sulfonylurea herbicides rimsulfuron and primisulfuron were investigated under laboratory conditions. Degradation in aqueous solutions was determined between pH 3 and 8 and between 5 and 35 C. Rimsulfuron degraded faster than primisulfuron. Half-lives at different temperatures at pH 4 ranged from 0.16 to 5.8 d for rimsulfuron and from 0.47 to 16.1 d for primisulfuron. Primisulfuron hydrolysis at 30 C decreased with increasing pH, but rimsulfuron decreased up to pH 7, then increased, suggesting rapid degradation in alkaline conditions. Adsorption, measured in six Colorado soils, was complete within 2 h in all soils. Adsorption isotherms were determined by batch equilibration of 75 to 600 μg L−1. Rimsulfuron was adsorbed in amounts 3.7 to 7 times higher than primisulfuron, with adsorption distribution coefficients (Kd) ranging from 0.1 to to 1.18 for primisulfuron and from 0.71 to 5.1 for rimsulfuron. Adsorption of both herbicides was slightly correlated with soil clay content, and primisulfuron adsorption was also correlated with organic matter content.

Keywords

Primisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]amino]sulfonyl]benzoic acidrimsulfuron, N-[[4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridine-sulfonamideSulfonylureashydrolysisadsorption isothermsKd
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 672 - 677
Copyright
Copyright © 1996 by the Weed Science Society of America 

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