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CE‐MS: A useful tool for the identification of water‐soluble polar organics in air and vehicular emitted particulate matter
Author(s) -
Yassine Mahmoud M.,
DabekZlotorzynska Ewa,
SchmittKopplin Philippe
Publication year - 2009
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.200800628
Subject(s) - chemistry , particulates , analytical chemistry (journal) , chromatography , repeatability , nitric acid , coating , inorganic chemistry , organic chemistry
A CE‐ESI/quadrupole‐MS method using an ammonium acetate‐based BGE (pH 4.7) was developed for the determination of isomeric benzoic acids in atmospheric aerosols and vehicular emission. UltraTrol ™ LN was employed as the pre‐coating polymer to suppress the EOF (0.3×10 −9 m 2 V −1 s −1 ) and achieve a baseline separation of the studied acids. Good repeatability for migration time (RSD<1%, N =10) was obtained without coating regeneration. The high pre‐coating stability allowed coupling of CE to MS without ion suppression in the MS. In scanning mode and using field‐amplified sample injection with electrokinetic injection (−5 kV for 60 s), LODs ( S / N =3) ranged from 2.5 to 6 μg/L for standard target analytes prepared in DI water. In the presence of 100 mg/L of sulfate (added to simulate a sample matrix), LODs ranged from 8 to 90 μg/L. Several isomeric aromatic acids could be separated in atmospheric and diesel‐engine‐emitted particulate matter extracts based on their different acidities. Additional measurements with a flow infusion ESI Fourier transform ion cyclotron resonance MS were used for further structural information acquisition on the unknown compounds and allowed their formula to be proposed.