Self-referencing spectrophotometric measurements

Patent Application · Mon Feb 12 00:00:00 EST 1990

OSTI ID:5635896

O'Rourke, P E; Van Hare, D R

A method for measuring the concentration of a chemical substance by spectrophotometry comprising the steps of placing a sample of a photoreactive substance between the light source and a spectrophotometer, obtaining an absorption spectrum of the substance using a fixed amount of light from the light source, obtaining a second absorption spectrum after a short interval comparing the two to determine the concentration of the chemical substance from the difference in the spectra. If the chemical substance is not photoreactive, a photoreactive mixture can be made with a photoreactive dye that has photoreactive properties unique to the mixture. Alternatively, an optically transparent substrate can absorb the substance or the dye/substance mixture. 3 figs.

• Research Organization: Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC09-76SR00001
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7478326
• Application Number: ON: DE91011582; PPN: US 7-478326
• OSTI ID: 5635896
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
SPECTROPHOTOMETRY
ABSORPTION SPECTRA
CHEMICAL ANALYSIS
CONCENTRATION RATIO
GROUND WATER
INVENTIONS
MEASURING METHODS
SPECTROPHOTOMETERS
HYDROGEN COMPOUNDS
MEASURING INSTRUMENTS
OXYGEN COMPOUNDS
SPECTRA
WATER
400102* - Chemical & Spectral Procedures
440800 - Miscellaneous Instrumentation- (1990-)