CPC G01N 31/221 (2013.01) [G01N 24/08 (2013.01); G01R 33/465 (2013.01)] | 14 Claims |
1. A method for determining pH of a composition, the method comprising:
preparing a calibration curve of a chemical species comprising an acid dissociation constant, wherein preparing the calibration curve comprises plotting a chemical shift of the chemical species relative to pH;
determining a chemical shift of a composition comprising the chemical species; and
determining the pH of the composition with the chemical shift of the composition and the calibration curve;
wherein the composition is a gel, paste, colloid, or aqueous solution and is selected from the group consisting of an oral care product, a home care product, a personal care product, and combinations thereof.
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