Monohydroxyfluoboric acid is described as a reagent for the determination of the organophosphorus compounds malathion and parathion. The reagent breaks the ether linkage to phosphorous to form a phosphoro-or phosphono-fluoridate which is then colorimetrically determined by reaction with hydrogen peroxide and 2,7-diaminofluorene. of the organophosphorus compounds can be determined. From 0.01 to 0.50 mg./ml.
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