Electronic absorption of anthracene in supercritical carbon dioxide
AdvisorVemulapalli, G. K.
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PublisherThe University of Arizona.
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AbstractThere has been much interest in the last five or ten years in supercritical fluid extraction. In addition to the fact that some supercritical fluids may be less harmful to the environment than traditional extraction solvents, claims have been made for the superior extraction capabilities of supercritical fluids. In a few cases concentrations from absorbance measurements in the supercritical have been calculated with absorptivities derived from studies in liquid systems. This study suggests that the molar absorptivity in the supercritical may be quite different from that in a liquid system. The Beer's Law analysis done here was not adaquate to determine the absolute molar absorptivities in the system being examined, anthracene in carbon dioxide. This failure is in large part due, however, to the relative crudeness of the equipment and procedure used. While failing in the quantitative analysis, a use of Beer's Law in a qualitative capacity may be warranted. The analysis does succeed as an indicator of changes in molecular behavior that occur not only between liquid and high-pressure systems but also those, much slighter, that occur between high-pressure liquid and supercritical fluid systems.
Degree ProgramGraduate College