Graduate Thesis Or Dissertation
 

A three-phase argon plasma arc for analytical emission spectroscopy

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  • A new three-phase argon plasma arc was developed for analytical emission spectroscopy. The power supplied to the plasma arc utilized a simple circuit with three-phase as line voltage stepped down via a transformer to 104Vrms. A three concentric quartz tubing assembly was determined to be the optimum configuration for supplying argon and sample aerosol to the plasma. A Babington-type nebulizer with a split sample aerosol flow stream was constructed and used to supply sample aerosol to the three-phase plasma arc. The three-phase argon plasma arc has an area of low electron density in the center which enabled the sample, in aerosol form, to be efficiently introduced into the plasma. Desolvation of the sample aerosol prior to reaching the plasma enhanced the emission signal by 30%. Detection limits between 0.1 ppm and 2 ppm were determined for seven elements. Calibration curves yielded a linear dynamic concentration range of approximately three orders of magnitude. Background emission from the tungsten electrodes employed was recorded from 250-600 nm.
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