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Ionization of Buthidazole, VEL 3510, Tebuthiuron, Fluridone, Metribuzin, and Prometryn

Published online by Cambridge University Press:  12 June 2017

J. B. Weber
J. B. Weber*
Affiliation:
Weed Sci., North Carolina State Univ., Raleigh, NC 27650
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Abstract

Aqueous solutions of buthidazole {3-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl]-4-hydroxy-1-methyl-2-imidazolidinone}, VEL 3510 {1-β,β-dimethoxyethyl-1-methyl-3-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl] urea}, tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl]-N,N′-dimethylurea}, fluridone 1-methyl-3-phenyl-5-[3-trifluoromethyl)phenyl]-4(1H)-pyridinone, metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one], and prometryn [2,4-bis(isopropylamino)-6-(methylthio)-s-triazine] were spectrophotometrically titrated to obtain pKA values. Ionizing properties of the chemicals were compared with other related compounds reported in the literature. The pKA values for the six herbicides were 0.6 and 11.3, 0.9 and 9.0, 1.2, 1.7, 1.1, and 4.1, respectively.

Keywords

Ionic herbicidesdissociated herbicidesdissociation constantsionization constants
Type
Research Article
Information
Weed Science , Volume 28 , Issue 5 , September 1980 , pp. 467 - 474
Copyright
Copyright © Weed Science Society of America 

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References

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