Microwave plasma continuous emissions monitor for trace-metals in furnace exhaust
- Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
- T&R Associates, Wayne, Pennsylvania 19087 (United States)
A microwave plasma continuous emissions monitor has been successfully demonstrated for sensitive ({lt}1 ppb), real time measurements of trace metals in furnace exhaust. The instrument uses a robust, up to 1.5 kW, 2.45 GHz microwave plasma sustained in a portion of the undiluted furnace exhaust flow for atomic emission spectroscopy. The waveguide device is constructed of refractory materials compatible with high-temperature environments ({approx_gt}500{degree}C) and is flange mountable into the inside of the furnace exhaust duct. Fused quartz fiber optics in close proximity to the plasma flame transmit the UV through visible emission (190{endash}690 nm) to three spectrometers for simultaneous monitoring of several metals. This instrument has been used for continuous monitoring for a 49 h period with 0.5 s time resolution on a dc graphite electrode arc furnace during a soil vitrification test. Results are presented for chromium, manganese, and iron emissions during soil loading operations. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 385892
- Journal Information:
- Review of Scientific Instruments, Vol. 67, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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