Chemistry: analytical and immunological testing – Metal or metal containing – Zn – cd – hg – sc – y – or actinides – or lanthanides
Patent
1997-05-12
1999-03-09
Soderquist, Arlen
Chemistry: analytical and immunological testing
Metal or metal containing
Zn, cd, hg, sc, y, or actinides, or lanthanides
436 73, 436155, 436158, 436181, 436182, 422 50, 422 62, 422 78, 422 80, 422 81, 422 8209, 422 93, 250373, 73 2331, G01N 3320, G01N 2101
Patent
active
058799486
ABSTRACT:
The present invention relates to a system, apparatus, and process to reduce the oxidized mercury in an exhaust gas to elemental mercury and to prevent its reoxidation by congeneric components in the exhaust gas prior to the photometric measurement of said elemental mercury. In the process, the sample stream flows through a reactor heated to preferably about 800.degree. C. in which a stream of hydrogen is introduced directly into a hot portion thereof. The congeneric oxidized mercury species, i.e, HgCl.sub.2, and HgO are thermally reduced quantitatively to elemental mercury. The hydrogen reacts in situ with oxygen to form water vapor and with chlorine to form hydrochloride gas. The hydrochloride gas is effectively absorbed by the water vapor and consequently prevents the reoxidation of elemental mercury. The concentration of total mercury in a stream can then be determined by the intensity of radiation absorbed by a UV spectrometer.
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Meischen Sandra J.
Van Pelt Vincent J.
Petrusek Robert A.
Soderquist Arlen
Tennessee Valley Authority
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