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DEVELOPMENT OF A THERMAL DESORPTION
CHEMICAL IONIZATION MOBILITY MASS
SPECTROMETER FOR SPECIATION OF ULTRAFINE
AEROSOLS
By
Sonya Collier
___________________________________________________
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(AEROSPACE ENGINEERING)
December 2009
Copyright 2009 Sonya Collier
Object Description
| Title | Development of a thermal desorption chemical ionization mobility mass spectrometer for the speciation of ultrafine aerosols |
| Author | Collier, Sonya |
| Author email | sonya.miranda.hevia@gmail.com; sonyacol@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Aerospace Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2009-08-27 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-09-29 |
| Advisor (committee chair) | Phares, Denis J. |
| Advisor (committee member) |
Wang, Hai Browand, Frederick Muntz, Eric Phillip Henry, Ronald |
| Abstract | The preliminary investigation of a thermal desorption-chemical ionization-mobility mass spectrometer for the in situ speciation of ultrafine organic particles is presented. The motivation for this work stems from the lack of knowledge about the chemical compounds present in ultrafine particles which affect human respiratory health as well as the global radiation budget. There is a need for instrumentation that can provide fast temporal resolution and multi-dimensional chemical data with minimal fragmentation of the volatile organics. The instrument under investigation includes an electrostatic inlet capable of size-selecting particles and thermally desorbing them for further analysis downstream. It uses chemical ionization to ionize the gas-phase sample with minimal fragmentation. Ion mobility spectrometry and time-of-flight mass spectrometry will be coupled to provide 2-dimensional data for positive identification of the complex organic compounds.; The inlet has been tested to determine the particle collection efficiency at various particle sizes. The reaction region, mobility spectrometer and mass spectrometer have been tested and characterized in various instrumental configurations. A chemical ionization mass spectrometer and a chemical ionization mobility spectrometer have been tested using both volatile organic compounds and aerosol standards. A preliminary test of the chemical ionization mobility mass spectrometer has been completed. The results presented suggest that the instrument is currently deployable in one of various configurations tested for speciation of ambient aerosol. |
| Keyword | ultrafine; aerosols; chemical ionization; mobility; mass spectrometry; thermal desorption |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2624 |
| Contributing entity | University of Southern California |
| Rights | Collier, Sonya |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Collier-3214 |
| Archival file | uscthesesreloadpub_Volume56/etd-Collier-3214.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Full text | DEVELOPMENT OF A THERMAL DESORPTION CHEMICAL IONIZATION MOBILITY MASS SPECTROMETER FOR SPECIATION OF ULTRAFINE AEROSOLS By Sonya Collier ___________________________________________________ A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (AEROSPACE ENGINEERING) December 2009 Copyright 2009 Sonya Collier |
