Self Absorption Effects on the Detection of Hg and Cd in an Atmospheric Microwave Sustained Plasma

Details Self Absorption Effects on the Detection of Hg and Cd in an Atmospheric Microwave Sustained Plasma Self Absorption Effects on the Detection of Hg and Cd in an Atmospheric Microwave Sustained Plasma

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..gec.qf106h&link_type=abstract

American Physical Society, Gaseous Electronics Conference October 5-8, 1999 Norfolk, VA, abstract #QF1.06

Physics

Scientific paper

The detection limits for cadmium and mercury at the 228.8 nm and 253.65 nm transitions, respectively, in an atmospheric 1.5 kW, 2.45 GHz microwave sustained plasma has been found to depend on the path length between the plasma and the detection system. Atomic emission spectroscopy of such microwave plasma is under development as a real-time monitor of EPA regulated hazardous metals in smokestacks. Measurements of the detection limits for axial and radial side views of the discharge show a clear increase of the axial detection limit. Self absorption by unexcited cadmium and mercury along the longer turbulent axial propagation path is shown to be responsible for the increase of the detection limits.

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