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Determination of gaseous and particulate carbonyls in air by gradient‐elution micellar electrokinetic capillary chromatography
Author(s) -
Sun Hui,
Chan King Yee,
Fung Ying Sing
Publication year - 2008
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200800082
Subject(s) - chemistry , derivatization , chromatography , micellar electrokinetic chromatography , detection limit , particulates , capillary electrophoresis , gradient elution , electrokinetic phenomena , elution , capillary action , analytical chemistry (journal) , gas chromatography , mass spectrometry , high performance liquid chromatography , organic chemistry , meteorology , physics
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 μg/m 3 and working range from 0.11 to 43.3 μg/m 3 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.