skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Colorimetric determination of pH

Abstract

There is a need for a simple, rapid, reliable means for determining pH values of concentrated, high salt solutions without reliance on human eye and ambient light. The method comprises the steps of preparing a set of reference solutions, measuring the light absorption by each reference solution, adding indicator dye to each reference solution, measuring the light absorption by each such reference mixture, comparing the two solutions to determine the dye color at each pH, normalizing the spectra of mixture to the isosbestic point, and matching the color of the pH of the solution to one of the colors of the pHs in the reference solution set. In this way, the pH can be determined to within 0.1 pH unit, a far more precise method than using the human eye.

Inventors:
;
Publication Date:
Research Org.:
Westinghouse Savannah River Co., Aiken, SC (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10147517
Patent Number(s):
PATENTS-US-A7681297
Application Number:
ON: DE93012027
Assignee:
Dept. of Energy
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent Application
Resource Relation:
Other Information: PBD: 1991
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PH VALUE; MEASURING METHODS; SOLUTIONS; BRINES; ABSORPTION SPECTROSCOPY; DYES; 400102; CHEMICAL AND SPECTRAL PROCEDURES

Citation Formats

Baumann, E W, and Buchanan, B R. Colorimetric determination of pH. United States: N. p., 1991. Web.
Baumann, E W, & Buchanan, B R. Colorimetric determination of pH. United States.
Baumann, E W, and Buchanan, B R. 1991. "Colorimetric determination of pH". United States.
@article{osti_10147517,
title = {Colorimetric determination of pH},
author = {Baumann, E W and Buchanan, B R},
abstractNote = {There is a need for a simple, rapid, reliable means for determining pH values of concentrated, high salt solutions without reliance on human eye and ambient light. The method comprises the steps of preparing a set of reference solutions, measuring the light absorption by each reference solution, adding indicator dye to each reference solution, measuring the light absorption by each such reference mixture, comparing the two solutions to determine the dye color at each pH, normalizing the spectra of mixture to the isosbestic point, and matching the color of the pH of the solution to one of the colors of the pHs in the reference solution set. In this way, the pH can be determined to within 0.1 pH unit, a far more precise method than using the human eye.},
doi = {},
url = {https://www.osti.gov/biblio/10147517}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1991},
month = {Tue Dec 31 00:00:00 EST 1991}
}