Fluid analysis

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G - Physics

01

N

150/9

G01N 33/52 (2006.01) G01N 33/84 (2006.01)

Patent

CA 1198346

ABSTRACT OF THE DISCLOSURE In a method for colorimetric determination of calcium, the sample to be analyzed is mixed with a dye reagent of pH value at which that reagent does not produce a predetermined change when complexed with calcium ions. A first colorimetric measurement is made on the mixture of the sample and dye reagent. A second reagent is then added to the mixture of the sample and dye reagent to shift the pH and activate the dye reagent producing the predetermined change. A second colorimetric measurement is then made on the resulting mixture. The difference between the two colorimetric measurements is a measure of the amount of calcium in the sample.

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