 |
| Titel |
MS/MS studies for the selective detection of isomeric biogenic VOCs using a Townsend Discharge Triple Quadrupole Tandem MS and a PTR-Linear Ion Trap MS |
| VerfasserIn |
M. Müller, L. H. Mielke, M. Breitenlechner, S. A. McLuckey, P. B. Shepson, A. Wisthaler, A. Hansel |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 2 ; Nr. 2, no. 2 (2009-11-12), S.703-712 |
| Datensatznummer |
250000577
|
| Publikation (Nr.) |
 copernicus.org/amt-2-703-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| We performed MS/MS investigations of biogenic volatile organic compounds
(BVOC) using a triple quadrupole tandem mass spectrometer (QqQ-MS) equipped
with a Townsend Discharge ion source and a Proton Transfer Reaction Linear
Ion Trap (PTR-LIT) mass spectrometer. Both instruments use H2O chemical
ionization to produce protonated molecules. Here we report a study of the
application of these instruments to determine methyl vinyl ketone (MVK) and
methacrolein (MACR) and a series of monoterpenes (α-pinene, β-pinene, 3-carene, limonene, myrcene, ocimene)
and sesquiterpenes (humulene and farnesene). Both instruments achieved sub-ppb detection limits in the
single MS mode and in the MS/MS mode for differentiating MVK and MACR.
Collision induced dissociation (CID) of protonated monoterpenes and
sesquiterpenes was studied under the relatively high-energy, single-to-few
collision conditions of the QqQ-MS instrument and under the low-energy,
multiple collision conditions of the PTR-LIT. Differences and similarities
in the breakdown curves obtained are discussed. In addition, we performed
MS4 of protonated limonene to illustrate the analytical power of the
PTR-LIT. In spite of the progress we have made, the selective on-line
mass-spectrometric detection of individual monoterpenes or sesquiterpenes in
complex mixtures currently does not yet seem to be possible. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|