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  • A quadratic programming routine for the statistical analysis of gas chromatographic data

    Creator:
    Elliott, Stanley Claud, Jr
    Abstract:
    A quadratic programming method was developed for the statistical analysis of gas chromatographic data. The method was applied to three types of flavor extracts, peppermint, hops and brewed tea. The brewed tea data had to be abandoned because of the singularity of its coveriance matrix. In all cases tried the...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: Stephen J. Hawkes A quadratic programming method was developed for the statisti- cal analysis

  • Gas chromatographic determination of selenium in biological materials

    Creator:
    Pedersen, Nels David
    Abstract:
    A method for the determination of selenium in biological materials by gas-liquid chromatography has been developed and successfully applied to kidney, heart, liver, and muscle tissue. The initial digestion of animal tissue was accomplished in a mixture of nitric and perchloric acids (3:1) until "water whiteness'' of solution was achieved....
    Resource Type:
    Masters Thesis
    Full Text:
    DETERMINATION OF SELENIUM IN BIOLOGICAL MATERIALS Redacted for Privacy Abstract approved: Stephen J. Hawkes A

  • Solute-solvent interactions in gas chromatography

    Creator:
    Chan, Edwin Ming Yeung
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved Redacted for Privacy ttephen J. Hawkes The study of solute-solvent interactions in gas

  • Diffusion in silicone polymers

    Creator:
    Kong, Ming J.
    Abstract:
    The study of diffusion coefficients of n-alkanes and other organic compounds in silicones is undertaken by gas-liquid chromatography. About 0. 3% of stationary phase is coated on glass bead support so that the only significant source of peak spreading is due to slow liquid phase mass transfer. Diffusion coefficients are...
    Resource Type:
    Masters Thesis
    Full Text:
    ) (date) Title: DIFFUSION IN SILICONE POLYMERS Abstract approved: Redacted for privacy Stephen J

  • Diffusion of n-alkanes in polydimethylsilicones

    Creator:
    Millen, William George
    Abstract:
    Diffusion of short chain n-alkanes was found to be faster in the polydimethylsilicone elastomer SE-30 than in the polydimethylsilicone oil SF-96-2000. The opposite was true for the longer chain n-alkanes suggesting that choice of stationary phase for gas chromatography would depend on the chain length of sample components. The dependence...
    Resource Type:
    Masters Thesis
    Full Text:
    PrivacyAbstract approved: Stephen J. Hawkes Diffusion of short chain n-alkanes was found to be faster in the

  • Slow processes in gas-solid chromatography

    Creator:
    Burns, Walter Frederick
    Abstract:
    Gas-solid chromatography often has asymmetrical elution peaks. This is attributed to nonlinear isotherms, multi-energy adsorption sites, and slow processes. This study utilized a stopflow gas chromatograph with various NaOH and NaCl modified aluminas as adsorbents and methane as adsorbate to determine the influence of surface area and pore volume distribution...
    Resource Type:
    Masters Thesis
    Full Text:
    CHROMATOGRAPHY Abstract approved: Redacted for Privacy Stephen J. Hawkes Gas-solid chromatography often has

  • Classification of stationary liquids in gas chromatography by infrared spectrophotometry

    Creator:
    De Briceno, Maria Betania Orduz
    Abstract:
    A classification of stationary liquids by infrared spectroscopy to evaluate the polarity was made using the solvent effect technique. The infrared C-Cl absorption frequency shift was measured for solutions of 1-chlorohexane dissolved in each stationary phase. These frequency shifts were correlated to the relative retention times of 1-octene/n-octane, trans-2-octene/n-octane and...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy ltephen J. Hawkes A classification of stationary liquids by infrared spectroscopy

  • Acidity and basicity measurements of some silicone gas chromatographic liquid stationary phases

    Creator:
    Miller, Gary J.
    Resource Type:
    Masters Thesis
    Full Text:
    approved Stephen J. Hawkes Acidity and basicity measurements were made on some sili- cone stationary

  • The obstructive factor in gas chromatography

    Creator:
    Thumneum, Pornpan
    Abstract:
    The study of the obstructive factor by Hawkes (11) showed a relation between the obstructive factor and velocity using a continuous method. Later, Bowers and Hawkes (12) developed a similar method with some improvements in the apparatus and found out that the obstructive factor was not flow dependent. This study...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy J (Dr. Stephen J. Hawkes) The study of the obstructive factor by Hawkes (11) showed

  • The diffusion coefficient of propane in helium

    Creator:
    Tang, Fa-tai
    Abstract:
    A specially designed gas chromatograph with both TCD and FID has been tested for the measurement of the diffusion coefficients of methane and propane in helium. Knox's arrested elution technique(⁴) was used and yielded a value of 0.6431 cm²/sec averaged with the value obtained by Yang and Hawkes(⁷). Values of...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy Dr. Stephen J. Hawkes A specially designed gas chromatograph with both TCD and FID