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DETECTION OF MERCURIC BROMIDE IN A GAS PHASE FLOW CELL BY LASER PHOTOFRAGMENT FLUORESCENCE SPECTROSCOPY. (R825380)
Tong, X., R. B. Barat, AND A. T. Poulos. DETECTION OF MERCURIC BROMIDE IN A GAS PHASE FLOW CELL BY LASER PHOTOFRAGMENT FLUORESCENCE SPECTROSCOPY. (R825380). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 33(18):3260-3263, (1999).
Photofragment fluorescence (PFF) spectroscopy offers real-time monitoring
capability with high-analytical sensitivity and selectivity for volatile mercury
compounds found in process gas streams, such as incinerator stacks. In this
work, low concentrations (6 ppb to 30 ppm) of mercuric bromide
(HgBr2) vapor were introduced into an atmospheric pressure flow cell.
The PFF technique used 222 nm laser radiation to photolyze HgBr2 and
excite fluorescence from the resulting Hg atoms at 253.7 nm. The fluorescence
intensity was linear with laser fluence over the range of 45-180
mJ/cm2. Extrapolated detection limits by this method below 1 ppb of
HgBr2 in the absence of air are estimated. A linear dynamic detection
range up to 0.7 ppm (11 mg/m3) is reported.
Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL CENTER FOR ENVIRONMENTAL RESEARCH