Document Detail

Online Characterization of Particles and Gases with an Ambient Electrospray Ionization Source.
MedLine Citation:
PMID:  23013239     Owner:  NLM     Status:  Publisher    
Methods for on-line characterization and quantification of gas and particle phase species greatly facilitate the study of aerosol particle formation and reaction mechanisms. An on-line method for aerosol analysis has been developed by altering a conventional electrospray ionization (ESI) mass spectrometer to direct the aerosol flow through the nebulizing gas inlet. Interaction between the aerosol and electrospray droplets produces ions that are subsequently analyzed by MS or MS/MS with a quadrupole - ion trap (QTRAP) mass analyzer. Performance is assessed using several particle phase (cesium iodide, glycine) and gas phase (dimethylamine, dimethylnapthylamine) analytes as well as secondary organic aerosol (SOA) produced by ozonolysis of α-pinene. Analyte signal intensity is strongly dependent on solubility in the electrospray solvent, suggesting that the predominant ionization mechanism involves extraction of the analyte into the electrospray droplets. For gas phase analytes, gas phase charge transfer also appears to play a minor role in ion formation. As currently configured, the source is capable of characterizing oligomers in SOA at a mass loading under 30 μg/m3 and quantifying alkyl amine concentrations between approximately 8ppb and 1ppm.
Andrew J Horan; Yuqian Gao; Wiley A Hall; Murray V Johnston
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-27
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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