Transformation and persistence of the herbicide (/sup 14/C)haloxyfop-methyl in soil under laboratory conditions

Journal Article · · J. Agric. Food Chem.; (United States)

OSTI ID:6941048

Smith, A E

The transformation of the herbicidal ester (/sup 14/C)haloxyfop-methyl (methyl 2-(4-((3-chloro-5-(trifluoro-methyl)-2-pyridinyl)oxy)(ring-U-/sup 14/C)phenoxy)propanoate) was studied in three prairie soils at 20 +/- 1 /sup 0/C. In all soils the ester was rapidly hydrolyzed to the corresponding (/sup 14/C)haloxyfop acid, providing there was moisture in excess of the wilting point. In air-dried soils little hydrolysis of the ester to acid occurred. In moist nonsterile soils, there was a loss of solvent extractable radioactivity with time. These losses followed first-order kinetics, with half-lives of 27, 38, and 92 days respectively in the sandy loam, heavy clay, and clay loam soil types. Traces of a second transformation product and (/sup 14/C) carbon dioxide were noted. Prolonged treatment of the solvent extracted soils with dilute sodium hydroxide released further small amounts of (/sup 14/C) haloxyfop acid.

• Research Organization: Agriculture Canada, Regina, Saskatchewan
• OSTI ID: 6941048
• Journal Information: J. Agric. Food Chem.; (United States), Journal Name: J. Agric. Food Chem.; (United States) Vol. 33:5; ISSN JAFCA
• Country of Publication: United States
• Language: English

Related Subjects

553006* -- Agriculture & Food Technology-- Other Agricultural Applications-- (1987-)
60 APPLIED LIFE SCIENCES
BENCH-SCALE EXPERIMENTS
CARBON 14 COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
HERBICIDES
HYDROLYSIS
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
LYSIS
OXIDES
OXYGEN COMPOUNDS
PESTICIDES
REACTION KINETICS
SOIL CHEMISTRY
SOILS
SOLVOLYSIS
TRACER TECHNIQUES