Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-02-01
1995-10-10
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2504831, 422 8205, H01J 516
Patent
active
054573130
ABSTRACT:
An optical sensing device for uranyl and other substances, a method for making an optical sensing device and a method for chemically binding uranyl and other indicators to glass, quartz, cellulose and similar substrates. The indicator, such as arsenazo III, is immobilized on the substrate using a chemical binding process. The immobilized arsenazo III causes uranyl from a fluid sample to bind irreversibly to the substrate at its active sites, thus causing absorption of a portion of light transmitted through the substrate. Determination of the amount of light absorbed, using conventional means, yields the concentration of uranyl present in the sample fluid. The binding of uranyl on the substrate can be reversed by subsequent exposure of the substrate to a solution of 2,6-pyridinedicarboxylic acid. The chemical binding process is suitable for similarly binding other indicators, such as bromocresol green.
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Mimms, L. T., Spectrophotometric Study of Coverage and Acid-Base Equilibrium of a Chemically Bonded Base, Analytical Chem. vol. 89 1977 pp. 355-361.
G. B. Harper, Reusable Glass-Bound pH Indicators, Analytical Chemistry vol. 47 Feb. 1975 pp. 348-351.
Baylor Lewis C.
Buchanan Bruce R.
Allen Stephone B.
Dixon Harold M.
Moser William R.
The United States of America as represented by the United States
Tumm Brian R.
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