DETERMINATION OF LOWER ALIPHATIC CARBONYL-COMPOUNDS IN STACK GAS AS THEIR 2,4-DINITROPHENYLHYDRAZONES BY MICELLAR ELECTROKINETIC CHROMATOGRAPHY

A method for the determination of lower aliphatic carbonyl compounds i n stack gas was described. Carbonyls were sampled with 2,4-dinitrophen ylhydrazine (DNPH). The sorbent was extracted with carbon disulfide, a nd the hydrazones were determined by micellar electrokinetic chromatog raphy (MEKC) with UV detection al 214 nm. Under the optimized MEKC con ditions, the DNPH derivatives of the three carbonyls ( formaldehyde, a cetaldehyde and acetone) were completely separated from one another. T he method was validated over the range of 10-500 mg/L of carbonyl-DNPH . The detection limit of the method was 2.0 mg/L, which is suitable fo r the determination of carbonyls in stack gas samples. (C) 1997 Elsevi er Science Ltd.