Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-03-06
1982-05-11
Marantz, Sidney
Chemistry: physical processes
Physical processes
Crystallization
356 36, 356407, 356408, G01N 2127, G01N 2178
Patent
active
043291490
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.
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J. A. Howell et al., Microchemical Journal, 15, 598-606, (1970).
Larson Paul
Schoonover David J.
Hach Chemical Company
Marantz Sidney
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