Laboratory investigations of the alpha-pinene/ozone gas-phase reaction
In order to provide more insight into terpene photooxidation or ozonolysis reaction mechanisms, a radiotracer technique was developed. This technique was applied to an investigation of the /sup 14/C-alpha-pinene/ozone reaction. In the first phase of the research, the carbon distribution at the conclusion of the ozonolysis reaction was determined by separating carbon-14-labelled gaseous products from labelled aerosols, and counting each phase by liquid scintillation methods. The resulting carbon balance was 38% to 60% filtered aerosols, 6% to 20% gas phase compounds, and 11% to 29% products absorbed on the reaction chamber walls. Recoveries of the alpha-pinene carbon-14 ranging from 79% to 97% were achieved using this method. The alpha-pinene concentrations in these experiments were close to ambient (1 part per billion), yet the carbon balance was similar to that observed at much higher concentrations (>1 part per million). In the second phase of the alpha-pinene study, both gas and aerosol products of the ozonolysis reaction were collected on cartridges impregnated with 2,4-dinitrophenylhydrazine, then analyzed by HPLC. In the final experiments, alpha-pinene aerosol was reacted with a silylating agent to improve the detection of organic acids and alcohols. The gas chromatographic/mass spectrometric analysis of the silylated aerosol products showed evidence of dimer/polymer formation occurring in the ozonolysis reaction.
- Research Organization:
- Washington State Univ., Pullman (USA)
- OSTI ID:
- 5024394
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OZONE
PHOTOCHEMICAL REACTIONS
TERPENES
AIR POLLUTION
CARBON 14 COMPOUNDS
LIQUID COLUMN CHROMATOGRAPHY
LIQUID SCINTILLATION DETECTORS
SCINTILLATION COUNTING
TRACER TECHNIQUES
CHEMICAL REACTIONS
CHROMATOGRAPHY
COUNTING TECHNIQUES
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MEASURING INSTRUMENTS
ORGANIC COMPOUNDS
POLLUTION
RADIATION DETECTORS
SCINTILLATION COUNTERS
SEPARATION PROCESSES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
500101 - Environment
Atmospheric- Basic Studies- Radiometric Techniques- (-1989)