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Kirill V. Oskolok, Oksana V. Monogarova, Andrei V. Garmay, Mariia M. Ivanova
Indirect determination of the hydrogen
index of small volume solutions by digital colorimetry
Abstract
Abstract. A technique for indirect determination of the hydrogen index of
aqueous solutions of small volume (from units to hundreds of µl) by digital
colorimetry with the use of consumer optical raster imaging devices is
proposed. To find pH, no fixed color scales or information on the concentration
of acid-base indicator in the solution is needed. A prototype of a hand-held
analyzer based on a smartphone was developed for out-of-laboratory
applications. The accuracy of pH determination results was confirmed by ionometry
and spectrophotometry techniques.
Key words: pH determination, low volume aqueous solutions, digital colorimetry,
smartphone, office flatbed photoscanner
Copyright (C) Chemistry Dept., Moscow State University, 2002
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