Three-phase double-arc plasma for spectrochemical analysis of environmental samples |
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Authors: | M M Mohamed Z F Ghatass E A Shalaby M M Kotb M El-Raey |
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Institution: | (1) Medical Research Institute, Alexandria University, 165 El-Horreya Avenue, El-Hadra, P.O. Box 21561, Alexandria, Egypt, EG;(2) Institute of Graduate Studies and Research, Alexandria University, 163, El-Horreya Avenue, P.O. Box 832, Chatby 21526, Alexandria, Egypt, EG |
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Abstract: | A new instrument, which uses a three-phase current to support a double-arc argon plasma torch for evaporation, atomization
and excitation of solid or powder samples, is described. The sampling arc is ignited between the first and second electrode
while the excitation arc is ignited between the second and third electrode. Aerosol generated from the sample (first electrode)
is swept by argon gas, through a hole in the second electrode (carbon tubing electrode), into the excitation plasma. A tangential
stream of argon gas is introduced through an inlet orifice as a coolant gas for the second electrode. This gas stream forces
the excitation arc discharge to rotate reproducibly around the electrode surface. Discharge rotation increases the stability
of the excitation plasma. Spectroscopic measurements are made directly in the current-carrying region of the excitation arc.
An evaluation of each parameter influencing the device performance was performed. Analytical calibration curves were obtained
for Fe, Al, K, and Pb. Finally, the present technique was applied for the analysis of environmental samples. The present method
appears to have significant, low cost analytical utility for environmental measurements.
Received: 7 July 2000 / Revised: 6 September 2000 / Accepted: 10 September 2000 |
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