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Trace analysis of polyaromatic hydrocarbons in water using multiphoton ionization-membrane introduction mass spectrometry

✍ Scribed by Manish H. Soni; Andrew P. Baronavski; Stephen W. McElvany

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 160 KB
Volume: 12
Category: Article
ISSN: 0951-4198
DOI: 10.1002/(sici)1097-0231(19981115)12:21<1635::aid-rcm378>3.0.co;2-2

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✦ Synopsis

We have combined the resonance-enhanced multiphoton ionization (REMPI) technique with membrane introduction mass spectrometry to significantly enhance its performance in the direct analysis of select polyaromatic hydrocarbons (PAHs) in water. We have used UV radiation from a pulsed KrF (! = 248nm) excimer laser to selectively ionize PAHs sampled directly from their aqueous solutions by a silicone membrane probe. The ionization and mass analysis is carried out using a modified GCQ ion trap mass spectrometer. The REMPI method provides exceptional selectivity as demonstrated in the detection of parts-per-trillion levels of pyrene in the presence of abundant background neutrals from the matrix, pumpoil, membrane and other sources. The instrumentation and experimental results using naphthalene and pyrene are presented. The selectivity and sensitivity of standard electron impact ionization is also compared with 248 nm multiphoton ionization to illustrate the improvements in performance.

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