ML17341A685

Nuclear Chemistry Procedure NC-80, Determination of Ph in Aqueous Solutions.

ML17341A685
Person / Time
Site:	Turkey Point
Issue date:	01/22/1981
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17341A684	List: ML17341A683 ML17341A685 ML17341A686 ML17341A687 ML17341A688 ML17341A689 ML17341A690 ML17341A692 ML17341A693 ML17341A694 ML17341A695 ML17354A214 ML20038B413
References
NC-80, NUDOCS 8112080200
Download: ML17341A685 (4)

Text

FLORIDA POIIER AND LIGHT COMPANY TURKEY POINT UNITS 3 AND 4 NUCLEAR CHEMISTRY PROCEDURE NC-80 JANUARY 22 1981

1.0 Title

DETERMINATION OF pH IN A(UEOUS SOLUTIONS 2.0 .A royal and List of Effective Pa es:

2.1 ~Arova1:

22 2 2 2~1 22 21 2 1 2 Ry Pl 2 1 2 2 y 2 1  : 22-22 and Approved by Plant Manager - Nuclear: 1/22/81 2.2 List of Effective Pa es:

~Pa e Date ~Pa e Date 1 1/22/81 2 1/22/81

.0 ~Soo e:

3.1 Re uirements:

pH measurements are an important and necessary parameter in the control of general water chemistry. As such, it is routinely monitored in day-to-day chemistry control.

3 ~2 ~Pur ose:

The purpose of this procedure is to provide laboratory personnel with an approved, standardized method for determining pH in aqueous solutions using a pH meter.

3.3 Acce tance Criteria:

Insure that the pH meter has been standardized in accordance with the approved standardization procedure.

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1/22/81 T NUCLEAR CHEMISTRY PROCEDURE NC-80, PAGE 2 J DETERMINATION OF H IN A UEOUS SOLUTIONS 4.0 Instructi ons:

4.1 Verify that pH meter has been on or in standby for at least 30 minutes.

4.2 Rinse electrodes thoroughly with demineralized water, then rinse with a portion of the sample to be analyzed.

4.3 Transfer a portion of sample into a container suitable for analysis and immerse electrodes such that at least one-half inch of the electrode is

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covered.

4.4 Provide continuous stirring if desired.

4.5 Determine temperature of sample and set the temperature compensating knob to the corresponding temperature. Whenever practicable, the sample temperature should be 25'.5'.

NOTE: 'o temperature compensating knob is available when a microprocessor type instrument, i.e. Orion Ionalyzer, is used for pH measurements. The instrument is left in the pH mode at all times after it is buffered. The pH measurements are taken as soon as the reading stabilizes after the probes are immersed in the sample.

4.6 Place meter in read mode and allow the reading to stabilize.

4.7 If the system being tested for pH is either a steam generator, feedwater, condensate system, or any system treated with ammonium hydroxide (NH4OH),

the resultant pH value should be temperature corrected to 25'C as follows:

4.7.1 Use an applicable temperature correction chart or graph, or 4.7.2 If no graph or chart is available:

1. For sample temperatures greater than 25 C, add 0.025 pH units per C above 25'C to the resultant pH value.

2. For sample temperatures less than 25 C, subtract 0.025 pH units per 'C below 25'C from the resultant pH value.

4.8 Record the pH value obtained from the meter or the temper ature corrected pH value, whichever's applicable.

4.9 Return pH meter to standby condition and rinse electrodes with demineralized water.

NOTE: Leave pH meter in the standby position and electrodes immersed in demineralized water when instrument is not in use. Never put pH meter to read mode while electrodes are not immersed in solution.

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