Method for the fluorimetric quantitative determination of SO.sub

Details Method for the fluorimetric quantitative determination of SO.sub Method for the fluorimetric quantitative determination of SO.sub

1978-06-22

1981-03-03

Smith, Alfred E.

Radiant energy

Luminophor irradiation

Methods

250461R, G01N 2138, G01J 158

Patent

active

042543398

ABSTRACT:
A fluorimetric method for the quantitative determination of SO.sub.2 in gas provides a stable measuring base. It consists in lowering the background values in terms of SO.sub.2 concentrations to about 2/10 of one ppm by increasing the oxygen concentration in a reference gas to at least 2%. This is effected by adding to this reference gas an O.sub.2 -containing stream or an ozone-containing stream. When the ozone-oxygen mixture is used the increase in O.sub.2 concentration need not be higher than 0.5-1.0% (instead of at least 2%) to achieve the same background SO.sub.2 reduction (see FIG. 4).

REFERENCES:
patent: 3612866 (1971-10-01), Stevens
Schwarz et al., "Fluorescence Detection of Nitric Oxide in Oxygen", Anal. Chem., 47, No. 4, 4-75, pp. 703-707.
Schwarz et al., "Fluorescence Measurements of Benzene, Naphthalene, Anthracene, Pyrene, Fluoranthene, and Benzo[e]pyrene in Water", Anal. Chem., 48, No. 3, 3-76, pp. 524-528.
Schwarz et al., "Fluorescence Detection of Sulfur Dioxide in Air at the Parts per Billion Level", Anal. Chem., 46, No. 8, 7-74, pp. 1024-1028.

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