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This is the original version (as it was originally adopted).
This method determines the pH of:
caseinates.
The pH of caseinates: the pH, at 20 oC, of an aqueous solution of caseinates, as determined by the method specified.
The electrometric determination of pH of an aqueous solution of caseinate, using a pH meter.
Any water used in the preparation of the reagents or in the Procedure (6) shall be recently distilled water that has been protected from carbon dioxide absorption.
Two standard buffer solutions with pH values at 20 oC which are known to the second decimal place and will bracket the pH value of the sample under test, for example phtalate buffer solution of pH approximately 4 and a borax buffer solution of pH approximately 9.
As described in Section 1.2 of the General Provisions.
Adjust the temperature of the buffer solutions (4.1) to 20 oC and calibrate the pH meter in accordance with the manufacturer's instructions.
Transfer to the beaker (5.7) 95 ml of water, add 5,0 grams of the test sample (6.1), and mix using the mixer (5.6) for 30 seconds.
Allow to stand for 20 minutes at about 20 oC, covered with a watch glass.
Record, as the pH of the aqueous solution of caseinate, the value read from the dial of the pH meter to at least two decimal places.
The difference between the results of two determinations carried out simultaneously or in rapid succession on the same sample, by the same analyst, under the same conditions, shall not exceed 0,05 pH unit.
This repeatability interval should be achieved in 95 % of the times that the method is correctly carried out.
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