Abstract：
:Two-photon resonance enhanced multiphoton ionization (REMPI) has been shown to be a unique ionization method for mass spectrometry, exhibiting both high sensitivity and chemical selectivity. Because REMPI is a gas-phase method, its applications have been limited either to direct analysis of vapor phase samples, or in conjunction with an initial laser desorption or other vaporization step. We describe here for the first time a combination of membrane introduction mass spectrometry (MIMS) and REMPI with time-of-flight mass spectrometry (TOF-MS), which allows for the direct analysis of trace amounts of organic compounds in water samples. The objective of our research was the detection of very low levels of aromatic contaminants, particularly benzene, toluene, and xylene (BTX), in aqueous solutions without interference due to the water. We have measured limits of detection (LOD) for selected aromatics in water below 1 part-per-trillion with an averaging time of less than 10 s using a continuous sample flow.
journal_name
Chemospherejournal_title
Chemosphereauthors
Oser H,Coggiola MJ,Young SE,Crosley DR,Hafer V,Grist Gdoi
10.1016/j.chemosphere.2006.05.117subject
Has Abstractpub_date
2007-04-01 00:00:00pages
1701-8issue
9eissn
0045-6535issn
1879-1298pii
S0045-6535(06)01565-7journal_volume
67pub_type
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