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Updated: Jun 28, 2026

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters
Published on: April 16, 2015
Solution nebulization of aqueous samples into the tubular-electrode torch capacitatively-coupled microwave plasma
B M Patel1, J P Deavor, J D Winefordner
1Department of Chemistry, University of Florida, Gainesville, FL 32611, U.S.A.
Abstract:
This work shows the feasibility of using nebulization for introduction of aqueous samples into the tubular-torch capacitatively-coupled microwave plasma (CMP). Previously, solid electrodes were used with this type of plasma, in which analyte carrier and plasma support gases are premixed and swept around the electrode tip. With the new design, the analyte carrier gas passes through the centre of the hollow tubular electrode and mixes with the plasma support gas at the tip of the electrode where the plasma is formed. Sample solutions are nebulized with a Meinhard nebulizer and a laboratory-constructed spray chamber and desolvation system. The tubular torch is made of tantalum. Plasma gases investigated include argon, helium and nitrogen. Typical operating powers are 300-350 W. Elements studied include Ag, Al, Ba, Ca, Cd, Cr, Cs, Cu, K, Li, Na, Pb, Pd, Sr and Zn.
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