Add time:08/14/2019         Source:sciencedirect.com

A method was developed to detect alkyl methylphosphonic acids in complex matrices using gas chromatography–tandem mass spectrometry. By converting the acids to their trimethylsilyl derivatives and monitoring the collision-induced dissociation of m/z 153 to m/z 75 under electron ionization or methane chemical ionization (CI) conditions, five members of this series (alkyl=ethyl, isopropyl, isobutyl, pinacolyl and cyclohexyl) were selectively detected against backgrounds of diesel fuel and soil extracts containing base–neutral–acid polynuclear aromatic hydrocarbons and pesticides without interference. Detection limits were 200–500 pg injected. Ammonia CI was successfully employed for molecular mass confirmation.

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