Morris, Mark William
(2007)
USING THE FLOWING AFTERGLOW AS A CHEMICAL REACTION MASS SPECTROMETER.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
The flowing afterglow was used to study the formation and reaction of protonated hexamethyldisiloxane, protonated trimethylsilanol, and the trimethylsilyl cation with a variety of neutrals. The neutrals were selected based on their importance in volatile organic compound (VOC) monitoring and/or their type (i.e. amines, ketones, etc.). The reagent ions contain the trimethylsilyl group, which has been referred as a "large proton". The hydronium ion is used in VOC analysis; this ion clusters with water and only provides molecular weight information. Various products were identified such as proton transfer, trimethylsilyl transfer, hydride ion transfer, etc. Secondary products were also identified, which formed because of the presence of excess neutrals. These secondary products are unimportant if the reagent ions listed above are used for trace gas analysis.The flowing afterglow was used as a chemical reaction mass spectrometer to measure Henry's law constants. The Henry's law constant for acetonitrile was measured to be 49 ± 7, while the average value in the literature is 52 ± 3 mol/kg bar; the constant for acetone was measured to be 27 ± 3 and the literature value is 28 ± 3 mol/kg bar. The chemical reaction mass spectrometer was also used to detect VOCs from thermal decomposition of phenolic resin coated on a graphitic board. A custom SS vessel was used to decompose the resin. Phenol, ammonia, methyl and dimethyl phenol, and other VOCs were detected and quantified. Concentrations ranged from 0.1 to 10 ppm for a 50.5 mg piece of graphitic board.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
19 September 2007 |
| Date Type: |
Completion |
| Defense Date: |
2 May 2007 |
| Approval Date: |
19 September 2007 |
| Submission Date: |
23 May 2007 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
flowing afterglow; volatile organic compounds; ion/molecule reactions; mass spectrometry |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-05232007-154140/, etd-05232007-154140 |
| Date Deposited: |
10 Nov 2011 19:45 |
| Last Modified: |
15 Nov 2016 13:43 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/7937 |
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