Chemistry: analytical and immunological testing – Oxygen containing – Carbonyl – ether – aldehyde or ketone containing
Patent
1990-05-02
1992-07-21
Warden, Robert J.
Chemistry: analytical and immunological testing
Oxygen containing
Carbonyl, ether, aldehyde or ketone containing
436172, 422 681, 422 83, 422 88, G01N 2164
Patent
active
051322277
ABSTRACT:
Methods and apparatus for monitoring formaldehyde vapor in a gas, comprising directing the gas into contact with an aqueous acidic solution that can dissolve the vapor and thus collect it therein, separating the gas from the solution, reacting the solution with a reagent to form from the collected formaldehyde a derivative that can be excited by radiation at a wavelength in the range of about 230 to 300 (typically 254) nanometers to fluoresce at a substantially different wavelength, irradiating the solution at a wavelength in said range for excitation, and measuring the intensity of the resulting fluorescence. Typically the fluorescence is measured at a wavelength in the range of about 450 to 550 nanometers and the irradiation and the measurement of fluorescence are carried out by means comprising conventional fluorometric means.
REFERENCES:
patent: 4372747 (1983-02-01), Gabbay et al.
Okayama, A, "Fluorometric Determination of Urinary .delta.-Aminolevulinic Acid by High Performance Liquid Chromatography and Post-Column Derivatization", J. Chrom. , vol. 426, pp. 365-369, 1988.
Lazrus, A. L., et al., "Automated Fluorometric Determination of Formaldehyde in Air", Analytical Chemistry, vol. 60, No. 10, p. 1075, May 15, 1988.
Beasley, R. K. et al., "Sampling of Formaldehyde in Air With Coated Solid Sorbent and Determination by High Performance Liquid Chromatography", Analytical Chemistry, vol. 52, No. 7 pp. 1110-1114, 1980.
Batelle Memorial Institute
Blythe Stephanie
Dunson Philip M.
Warden Robert J.
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