G - Physics – 01 – N
Patent
G - Physics
01
N
150/7
G01N 21/01 (2006.01) G01K 11/06 (2006.01) G01N 31/22 (2006.01)
Patent
CA 1080096
CANADIAN PATENT APPLICATION OF MANDAYAM OSURI TIRU and MAJ-BRITT INGEGERD TIRU for A pH-INDICATOR COMPOSITION HAVING CONTROLLED CHANGE OF COLOUR AND pH ON FREEZING, AND A METHOD FOR THE PREPARATION THEREOF. Abstract of the Disclosure This invention relates to a pH-indicator composition com- prising a buffer solution containing at least one inorganic ion in solution, such as Na2HP04, which solution displays change of pH upon freezing, and a control agent which, by changing the ionic strength and the proton composition of the solution in the frozen state, affects the pH change. The composition further comprises at least one pH-indicating substance for displaying by colour changes of pH in the composition. Apart from affect- ing the pH/colour change, the control agent makes the pH/ colour change of the composition temperature-dependent at or below the freezing point, whereby the composition may be uti- lized for instance as a colour thermometer for low temperatures.
277260
Tiru Maj-Britt I.
Tiru Mandayam O.
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