Basic and applied projects in analytical chemistry: I. The development of a sulfur specific detector for gas chromatography based on SO/sub 2/ fluorescence. II. The application of laser Raman spectrometry for the determination of quartz and cristobalite in Mount St. Helens volcanic ash
Description of the absorption and fluorescence studies performed on S/sub 2/ and SO/sub 2/, methods of generating these molecules from sulfur containing compounds in a dynamic system, and the coupling of dynamic conversion with fluorescence detection to form a gas phase sulfur specific detector for gas chromatography is presented. The development of the gas phase fluorescence detector (GPFD) incorporated thermal oxidation of the reduced sulfur compounds and subsequent fluorescence detection of the resultant SO/sub 2/ produced. The detector was found to have a minimum detectability of 10 ng S and a linear dynamic range of over two order of magnitude. Laser Raman spectrometry (LRS) was examined for its utility in the identification and quantification of crystalline silica polymorphs, quartz and cristobalite, in the inhalable fraction of Mount St. Helens volcanic ash. Unlike the x-ray diffraction and infrared spectra, the Raman spectra of these two polymorphs contain specific identification bands which are completely resolved from one another and from other bands due to the ash matrix. The LRS methodology developed exhibited a detectability in the 0.5 to 1.0 wt% range for quartz and cristobalite in the untreated ash matrix. The development of the LRS system for the reliable quantitative determination of solid samples and the LRS results obtained on the NIOSH round-robin ash samples are summarized.
- OSTI ID:
- 6013538
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ASHES
CHEMICAL ANALYSIS
MT ST HELENS
SILICA
LASER SPECTROSCOPY
RAMAN SPECTRA
SULFUR
GAS CHROMATOGRAPHY
SULFUR DIOXIDE
FLUORESCENCE
ABSORPTION
CASCADE MOUNTAINS
CHALCOGENIDES
CHROMATOGRAPHY
ELEMENTS
FEDERAL REGION X
LUMINESCENCE
MINERALS
MOUNTAINS
NONMETALS
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR OXIDES
USA
WASHINGTON
400104* - Spectral Procedures- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400102 - Chemical & Spectral Procedures