Method for spectrophotometric compensation for colorimetric reagent variation
US4329149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Mar 6, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/78
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for compensating for error in amount of indicator added to a sample under test in bleaching chemistry analysis involves adding a reagent system comprising an indicator and a dye in relative amounts such that the indicator at one wavelength (the "measuring" wavelength) and the dye at a different wavelength (the "reference" wavelength) exhibit the same absorbance at zero concentration of the parameter of interest. Error in the amount of indicator added to the sample is compensated for by measuring the decrease in absorbance at the measuring wavelength after reaction of the indicator with the parameter of interest, against the absorbance at the reference wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.