ASTM D1293-99

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ASTM-D1293
ADOPTION NOTICE
ASTM-D1293, "WATER, PH OF", was adopted on 26-OCT-84 for use by
the Department of Defense (DoD). Proposed changes by DoD
activities must be submitted to the DoD Adopting Activity:
Commander, Naval Sea Systems Command, SEA 03R42, 2531 Jefferson
Davis Highway, Arlington, VA 22242-5160. Copies of this
document may be purchased from the American Society for Testing
and Materials 100 Barr Harbor Drive West Conshohocken,
Pennsylvania, United States, 19428-2959. http://www.astm.org/____________________
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Navy - AS, OS
DLA - GS, PS
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Designation:D 1293–99
Standard Test Methods for
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pH of Water
This standard is issued under the fixed designation D 1293; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope D 1193 Specification for Reagent Water
D 2777 Practice for Determination of Precision and Bias of
1.1 These test methods cover the determination of pH by
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Applicable Methods of Committee D-19 on Water
electrometric measurement using the glass electrode as the
D 3370 Practices for Sampling Water from Closed Con-
sensor. Two test methods are given as follows:
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duits
Sections
D5128 TestMethodforOn-LinepHMeasurementofWater
Test MethodA—Precise Laboratory Measurement 8 to 15
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Test Method B—Routine or Continuous Measurement 16 to 24
of Low Conductivity
D5464 TestMethodsforpHMeasurementofWaterofLow
1.2 TestMethodAcoverstheprecisemeasurementofpHin
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Conductivity
water utilizing at least two of seven standard reference buffer
E 70 Test Method for pH of Aqueous Solutions with the
solutions for instrument standardization.
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Glass Electrode
1.3 TestMethodBcoverstheroutinemeasurementofpHin
water and is especially useful for continuous monitoring. Two
3. Terminology
buffers are used to standardize the instrument under controlled
3.1 Definitions—For definitions of terms used in these test
parameters, but the conditions are somewhat less restrictive
methods, refer to Terminology D1129.
than those in Test Method A.
3.2 Definitions of Terms Specific to This Standard:
1.4 Both test methods are based on the pH scale established
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3.2.1 pH, n—the pH of an aqueous solution is derived from
by NIST (formerly NBS) Standard Reference Materials.
E, the electromotive force (emf) of the cell
1.5 Neither test method is considered to be adequate for
measurement of pH in water whose conductivity is less than glasselectrode|solution||referenceelectrode
about 5 µS/cm. Refer to Test Methods D5128 and D5464.
(where the double vertical line represents a liquid junction)
1.6 Precision and bias data were obtained using buffer
when the electrodes are immersed in the solution in the
solutions only. It is the user’s responsibility to assure the
diagrammed position, and E is the electromotive force ob-
s
validity of these test methods for untested types of water.
tained when the electrodes are immersed in a reference buffer
1.7 This standard does not purport to address all of the
solution.
safety concerns, if any, associated with its use. It is the
With the assigned pH of the reference buffer designated as
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responsibility of the user of this standard to establish appro-
pH , and E and E expressed in volts is the following:
s s
priate safety and health practices and determine the applica-
~E2E!F
s
bility of regulatory limitations prior to use.
pH5pH 1
s
2.3026RT
2. Referenced Documents
where:
2.1 ASTM Standards:
F 5 Faraday,
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D 1066 Practice for Sampling Steam R 5 gas constant, and
3
D 1067 Test Methods for Acidity or Alkalinity of Water T 5 absolute temperature, t (°C) + 273.15.
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The reciprocal of F/2.3026 RT is known as the slope of the
D 1129 Terminology Relating to Water
D 1192 Specification for Equipment for Sampling Water electrode, and is the expected difference in observed voltage
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fortwomeasurementsonepHunitapart.Valuesoftheslopeat
and Steam in Closed Conduits
various temperatures are given in Table 1.
1
These test methods are under the jurisdiction of ASTM Committee D-19 on
4. Summary of Test Method
Water
...