DETERMINATION OF C-1-C-5 CARBONYLS IN THE ATMOSPHERE BY 2,4-DINITROPHENYLHYDRAZINE-COATED SORBENT SAMPLING AND HPLC ANALYSIS - THE INFLUENCE OF WATER ON KETONE ANALYSIS

An improved analytical procedure has been developed for the detection and identification of volatile carbonyl compounds in air. The procedur e is based on carbonyl derivatization by 2,4-dinitrophenylhydrazine to form 2,4-dinitrophenylhydrazine derivatives. The analysis was perform ed by isocratic HPLC using UV detection. The procedure's reproducibili ty is better than 10%. Besides, it has been proved that water interfer es during the determination of ketones. So different water scrubbers h ave been tested, but have been shown not to be efficient enough for a quantitative measurement.