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Identification of Aromatic Compounds on a Single Microparticle by Laser Desorption/Ionization Ion Trap Mass Spectrometry

✍ Scribed by Kwanghee Hong; Kyuseok Song; Hyungki Cha; Mo Yang; Jongmin Lee; Gaeho Lee

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
99 KB
Volume
63
Category
Article
ISSN
0026-265X

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✦ Synopsis

A laser desorption/ionization ion trap mass spectrometer was developed and used for the identification of polycyclic aromatic hydrocarbons (PAHs) and pesticides, DDT and BHC, condensed on a single microparticle. The excimer (XeCl, 308 nm) laser was adopted for the desorption and ionization of the material from the particle surface and the resulting ions were analyzed with an ion trap mass spectrometer. The mass spectra obtained from laser desorption/ionization were similar to the results from electron impact ionization. Detection sensitivity was reached to sub-nanogram/ particle order when a 5 mJ/pulse of energy of the laser was used. Tandem mass spectrometry was applied to the characterization of DDT by way of collision-induced dissociation of the parent ion with ambient He buffer gas.

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