Pentafluorophenyl Hydrazine as a Derivatization Agent for the Determination of Twenty Carbonyl Compounds in the Atmosphere

摘要

A sensitive and reliable method has been developed for the simultaneous determination of twenty airborne carbonyl compounds in the C_1-C_(10) range. The carbonyls were collected onto solid sorbent coated with pentafluorophenyl hydrazine (PFPH), followed by solvent extraction and gas chromatographic (GC)/mass spectrometric (MS) analysis of the PFPH derivatives. The sorbent is packed into two separate sections in a glass sampling tube. The two-section design allows convenient checking of collection efficiency and breakthrough. The regression coefficient of the calibration curves (R~2), limit of detection (LOD), reproducibility (RSD, n=6) and recovery were in the range of 0.995-0.999, 0.15-1.04 ng/m~3, 7.3-13.2% and 92.7-109.2%, respectively. Compare field test with classical DNPH-HPLC/UV method, good agreement exited between the two methods for lower molecular carbonyls but PFPH method is found to be a better analytical method for determination of high molecular weight carbonyls.