Abstract
Two methods, based on preliminary thin-layer chromatography, have been developed for determining the β-fluoroethyl ester of xenyl acid in the technical product and the 2% liquid formulation. The acaricide, or a convenient amount of the formulation, is dissolved in acetone and the solution is spotted on a thin-layer chromatographic plate. After development and identification by means of a UV lamp, the M 2060 area is isolated, detached and eluted. In the case of the determination of the active ingredient in the technical product, hydrolysis is conducted on the eluate residue, followed by titration of the resulting xenyl acetic acid. In the liquid formulation, dehalogenation of the eluate residue is carried out with sodium biphenyl and fluorine is determined colorimetrically, by means of cerium nitrate and alizarin complexone, under special conditions.
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