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  • Metoxuron is a contact herbicide formerly used in Australia to control broadleaf weeds in carrots, parsnips, wheat and barley.
  • Metoxuron (MX) is a selective herbicide absorbed by the leaves and roots and acting as photosynthetic electron transport inhibitor at the photosystem II receptor site.
  • A simple and rapid titrimetric method for the determination of metoxuron, based on its oxidation with cerium(IV) in sulfuric acid medium, is described. The method permits detection of the end-point visually, potentiometrically or spectrophotometrically.
  • The phenylurea herbicide metoxuron and its main metabolite, 3-chloro-4-methoxyaniline, can be determined rapidly in aqueous samples via extraction, derivatization with heptafluorobutyric anhydride (HFBA), washing with an aqueous bufferof pH 8, and analysis by capillary GC with electron capture detection.
  • UV irradiation of metoxuron in aerated aqueous solution at 254?nm or between 300 and 450?nm led initially to an almost specific photohydrolysis of the CCl bond, resulting in the formation of 3-(3-hydroxy-4-methoxyphenyl)-1,1-dimethylurea (MX3) and hydrogen chloride.
  • Among the various physico-chemical processes which effect the fate of soil applied herbicides, adsorption-desorption is an important process which controls all other processes viz., the movement, persistence and degradation. Adsorption-desorption studies were conducted by equilibrating 5g of 2mm sieved soil sample with given initial concentrations of metoxuron.
  • An on-line automated method for photodegradation studies of isoproturon, diuron, atrazine, fenitrothion, and metoxuron by means of liquid chromatography/ mass spectrometry (LC/MS) with particle beam (PB) interface is described.

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