title: Determination of gaseous and particulate carbonyls in air by gradient-elution micellar electrokinetic capillary chromatography.
abstract: A new continuous-flow gradient-elution micellar electrokinetic capillary chromatography method is developed for the determination of airborne carbonyls after derivatization with 2,4-dinitrophenylhydrazine. A total of 16 carbonyls can be determined with detection limits ranging from 0.94 to 8.50 mg/L, working range from 4.72 to 346 mg/L, and repeatabilities (relative standard deviation, n=5) from 1.23 to 4.6% or 3.93 to 7.6% for migration time and peak area, respectively. Coupling with denuder-filter sampling, a preliminary survey has been conducted to determine gaseous and particulate carbonyls from air sampled at a roadside station. The method is shown to have sufficient sensitivity for 1-h sampling of ambient carbonyls with detection limits ranging from 0.045 to 1.2 microg/m3 and working range from 0.11 to 43.3 microg/m3 at a flow rate of 10 Lpm. The method requires minimal modification of commercially available capillary electrophoresis equipment and can differentiate gaseous and particulate carbonyls to provide essential information and objective data for adopting effective measures to combat the discharge of carbonyl compounds to the atmosphere.
authors.affiliation: Department of Chemistry, Hong Kong University, Hong Kong SAR, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Sun
authors.forename: King Yee
authors.initials: KY
authors.lastname: Chan
authors.forename: Ying Sing
authors.initials: YS
authors.lastname: Fung
mesh_terms: D000096:Acetone / Q000032:analysis; D000393:Air Pollutants / Q000737:chemistry*; D000447:Aldehydes / Q000032:analysis*; D002074:Butanones / Q000032:analysis; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000295:instrumentation / Q000379:methods; D005740:Gases / Q000737:chemistry; D006723:Hong Kong; D052638:Particulate Matter / Q000737:chemistry*; D010659:Phenylhydrazines / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D000447:Aldehydes; D002074:Butanones; D005740:Gases; D052638:Particulate Matter; D010659:Phenylhydrazines; D000096:Acetone; C004787:2,4-dinitrophenylhydrazine; C005222:methylethyl ketone