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Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1526-4998(200005)56:5<463::AID-PS138>3.0.CO;2-I/full Last checked: 03/14/2014 Access conditions: Item is within a limited-access website http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1526-4998(200005)56:5<463::AID-PS138>3.0.CO;2-I/pdf Last checked: 03/14/2014 Requires: PDF Reader Access conditions: Item is within a limited-access website |
Publication Type:
| Refereed |
Author(s): | Sarmah, Ajit K.;
Kookana, Rai S.;
Duffy, Michael J.;
Alston, Angus M.;
Harch, Bronwyn D. |
Author Affiliation: | Sarmah and Alston: Cooperative Research Centre for Soil and Land Management, and Department of Soil and Water, The University of Adelaide, Glen Osmond, SA, Australia; Kookana: Cooperative Research Centre for Soil and Land Management, and CSIRO Land and Water, Glen Osmond, SA, Australia; Duffy: DuPont Agricultural Enterprise, Experimental Station, Wilmington, DE; and Harch: CSIRO Mathematical and Information Sciences, Glen Osmond, SA, Australia |
Title: | Hydrolysis of triasulfuron, metsulfuron-methyl and chlorsulfuron in alkaline soil and aqueous solutions |
Source: | Pest Management Science. Vol. 56, No. 5, May 2000, p. 463-471. |
Publishing Information: | London : for the Society of Chemical Industry by John Wiley & Sons |
# of Pages: | 9 |
Related Web URL: | http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1526-4998(200005)56:5<463::AID-PS138>3.0.CO;2-I/abstract Last checked: 03/14/2014 Notes: Abstract only |
Keywords: | TIC Keywords: Alkaline soils; Hydrolysis; Metabolites; Triasulfuron; Metsulfuron methyl; Chlorsulfuron; Soil pH; Kinetics; Sulfonylurea herbicides
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Abstract/Contents: | "The hydrolysis of triasulfuron, metsulfuron-methyl and chlorsulfuron in aqueous buffer solutions and in soil suspensions at pH values ranging from 5.2 to 11.2 was investigated. Hydrolysis of all three compounds in both aqueous buffer and soil suspensions was highly pH-sensitive. The rate of hydrolysis was much faster in the acidic pH range (5.2-6.2) than under neutral and moderately alkaline conditions (8.2-9.4), but it increased rapidly as the pH exceeded 10.2. All three compounds degraded faster at pH 5.2 than at pH 11.2. Hydrolysis rates of all three compounds could be described well with pseudo-first-order kinetics. There were no significant differences (P=0,05) in the rate constants (k, day⁻¹) of the three compounds in soil suspensions from those in buffer solutions within the pH ranges studied. A functional relationship based on the propensity of nonionic and anionic species of the herbicides to hydrolyse was used to describe the dependence of the 'rate constant' on pH. The hydrolysis involving attack by neutral water was at least 100-fold faster when the sulfonylurea herbicides were undissociated (acidic conditions) than when they were present as the anion at near neutral pH. In aqueous buffer solution at pH>11, a prominent degradation pathway involved O-demethylation of metsulfuron-methyl to yield a highly polar degradate, and hydrolytic opening of the triazine ring. It is concluded that these herbicides are not likely to degrade substantially through hydrolysis in most agricultural alkaline soils." |
Language: | English |
References: | 18 |
Note: | Figures Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Sarmah, A. K., R. S. Kookana, M. J. Duffy, A. M. Alston, and B. D. Harch. 2000. Hydrolysis of triasulfuron, metsulfuron-methyl and chlorsulfuron in alkaline soil and aqueous solutions. Pest Manage. Sci. 56(5):p. 463-471. |
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| Web URL(s): http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1526-4998(200005)56:5<463::AID-PS138>3.0.CO;2-I/full Last checked: 03/14/2014 Access conditions: Item is within a limited-access website http://onlinelibrary.wiley.com/doi/10.1002/(SICI)1526-4998(200005)56:5<463::AID-PS138>3.0.CO;2-I/pdf Last checked: 03/14/2014 Requires: PDF Reader Access conditions: Item is within a limited-access website |
| MSU catalog number: SB 951 .A1 P45 |
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