Chemical analysis The method of aldehydes and ketones determination involves an adsorption of aldehydes and ketones aerosol mixture on a pipe filled with silica gel saturated with 2,4-dinitrophenylhydrazine, desorption of the compounds with acetonitrile in an ultrasound washer, and determination using reversed phase high performance liquid chromatography on an AT 1200 liquid chromatograph (Agilent Technologies) equipped with a Zorbax Eclipse PAH column (4,6 250 mm, 5m) and spectrophotometric detector DAD with detection at 360 nm
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