Fate and kinetics of carfentrazone‐ethyl herbicide in California, USA, flooded rice fields

  title={Fate and kinetics of carfentrazone‐ethyl herbicide in California, USA, flooded rice fields},
  author={Kenley K. Ngim and Donald G. Crosby},
  journal={Environmental Toxicology and Chemistry},
  • K. Ngim, D. Crosby
  • Published 1 March 2001
  • Medicine, Chemistry
  • Environmental Toxicology and Chemistry
Little is known of the environmental fate of the aryltriazolinone herbicide carfentrazone‐ethyl (compound I). Rice field applications of Shark® 40D commercial formulation to duplicate 5.7 m2 rings (119 g a.i./ha) and 464 m2 commercial basins (224 g a.i./ha) produced pseudo–first‐order half‐lives (t½) of 6.5 to 11.1 h in water and 37.9 to 174 h in sediment. The rapid dissipation from water was due to its hydrolysis to the chloropropionic acid (compound II), which further degraded to its… 
Carfentrazone-ethyl Pond Dissipation and Efficacy on Floating Plants
Carfentrazone-ethyl dissipated rapidly from the water column, did not occur in the sediment above the levels of quantification, and in greenhouse studies effectively controlled three species of aquatic weeds at relatively low rates.
Effect of carfentrazone-ethyl on three aquatic macrophytes.
The objective of this study was to determine the efficacy of carfentrazone on three submersed plants, Eurasian watermilfoil, parrotfeather, and sago pondweed, that cause problems in water bodies in many regions of the United States.
The sensitivity of soil enzymes, microorganisms and spring wheat to soil contamination with carfentrazone-ethyl
Carfentrazone-ethyl disrupted the biological equilibrium in soil by decreasing the abundance and biodiversity of soil-dwelling microorganisms, the activity of soil enzymes, the values of the biochemical activity indicator and spring wheat yields.
Comparison of Subsurface and Foliar Herbicide Applications for Control of Parrotfeather (Myriophyllum aquaticum)
Examining the efficacy of subsurface applications of seven herbicides labeled for aquatic use and comparing those applications to herbicides that can also be applied to emergent foliage concluded that multiple applications would be necessary to provide longer-term plant control.
Photoredoction of the chloropropionic acid of careentrazone‐ethyl in sodium sulfide crane flat meadow solutions
The purpose of this study was to determine whether the conversion of carfentrazone‐chloropropionic acid to carfentrazone‐propionic acid in sunlit rice paddies is attributed to photoreduction. Model
Comparison of Daytime and Night-time Applications of Diquat and Carfentrazone-ethyl for Control of Parrotfeather and Eurasian Watermilfoil
Parrotfeather ( Myriophyllum aquaticum Vell. Verdc.) and Eurasian watermilfoil ( Myriophyllum spicatum L.) are non-native invasive species that are often difficult to control. Once established, these
Stereoselective degradation behaviour of carfentrazone-ethyl and its metabolite carfentrazone in soils
The stereoselective environmental behaviour of carfentrazone-ethyl and its metabolite carfentrazone enantiomer in three types of soil were studied under aerobic conditions. Under aerobic conditions,
Sorption-desorption of flucarbazone and propoxycarbazone and their benzenesulfonamide and triazolinone metabolites in two soils.
Data show the importance of characterisation of both sorption and desorption of herbicide residues in soil, particularly in the case of prediction of herbicides residue transport, as potential transport of sulfonylaminocarbonyltriazolinone herbicide metabolites would be overpredicted if parent chemical soil sorption values were used to predict transport.
Tomato Root Uptake of Carfentrazone
Abstract Fresh market tomato is an important and valuable crop in Florida, accounting for 630 million dollars farm-gate value, which was 45% of the total value of the U.S. crop in 2010. In order to
Behavior of pesticides in water-sediment systems.
  • T. Katagi
  • Environmental Science
    Reviews of environmental contamination and toxicology
  • 2006
Not only the physicochemical properties and degradability of a pesticide but also the characteristics of the many phases composing a water-sediment system determine the actual pesticide behavior, and therefore it is necessary to appropriately design an experimental system by considering the real situation of the natural aqueous environment to be examined.


Selectivity and mode of action of carfentrazone‐ethyl, a novel phenyl triazolinone herbicide
The selectivity of this herbicide may, at least in part, be attributed to the lower accumulation of Proto IX in soybean than in the weeds, probably because of the ability of soybean to metabolize more carfentrazone into unknown metabolites than the weeds.
Mobility of Pesticides and Their Hydrolysis Metabolites in Soil
The soil thin layer chromatography technique was employed to assess the mobility of 21 chemicals (6 insecticides, 4 herbicides, and 11 of their hydrolysis metabolites) in 6 different soils. The
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Photodecomposition of the herbicide nitrofen phenoxy)azobenzene, and an artifact, N-[4-(2',4'(2,4-dichlorophenyl p-nitrophenyl ether) in aquedichlorophenoxy)]phenylformamide. Other pathous
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To estimate the reactivity of organic pesticides toward hydroxyl, a standard competitor, p-nitroso-N,N-dimethylaniline (PNDA), competes with a particular compound for the radicals produced by the
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Etude de l'hydrolyse en eau pure et dans des sediments du sous-sol du bromure d'isopropyl, du tetrachloro-1,1,2,2-ethane, du trichloro-1,1,1-ethane et du dibromure d'ethylene. On a releve des
The photochemical generation of hydrogen peroxide in natural waters
The photochemical formation of hydrogen peroxide in tryptophan solutions and natural waters was monitored by a sensitive spectrophotometric assay. Peroxide was characterized by ion exchange
Photochemistry and volatility of Drepamon in water
On etudie les principales voies de transformation et d'elimination du Drepamon (tiocarbazil) dans l'eau et l'on developpe des procedes analytiques pour les eventuels residus dans l'environnement