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Description of ASTM-D5128 2014ASTM D5128-14Historical Standard: Standard Test Method for On-Line pH Measurement of Water of Low ConductivityASTM D5128Scope 1.1 This test method covers the precise on-line determination of pH in water samples of conductivity lower than 100 μS/cm (see Table 1 and Table 2) over the pH range of 3 to 11 (see Fig. 1), under field operating conditions. pH measurements of water of low conductivity are problematic for conventional pH electrodes, methods, and related measurement apparatus.
TABLE 1 Calculated Conductivity and pH Values at 25°C of Low Concentrations of NaOH in Pure Water A
Note 1—This table tabulates the theoretical conductivity and pH values of low levels of NaOH in pure water as
calculated from available thermodynamic data.
Note 2—To illustrate the high sensitivity of the sample pH at these low concentrations to contaminants, the last
column lists errors that would result if the sample were contaminated with an additional 1 mg/L through sample or equipment handling errors.
A Data courtesy of Ref (1).B This data developed from algorithms originally published in Ref (2).
B The boldface numbers in parentheses refer to a list of references at the end of this standard.
TABLE 2 Calculated Conductivity and pH Values at 25°C of Low Concentrations of HCl in Pure Water A
Note 1—This table tabulates the theoretical conductivity and pH values of low levels of HCl in pure water as
calculated from available thermodynamic data
Note 2—To illustrate the high sensitivity of the sample pH at these low concentrations to contaminants, the last
column lists errors that would result if the sample were contaminated with an additional 1 mg/L through sample or equipment handling errors.
A Data courtesy of Ref (1). This data developed from algorithms originally published in Ref (2).
FIG. 1 Restrictions Imposed by the Conductivity pH Relationship
1.2 This test method includes the procedures and equipment required for the continuous pH measurement of low conductivity water sample streams including the requirements for the control of sample stream pressure, flow rate, and temperature. For off-line pH measurements in low conductivity samples, refer to Test Method D5464. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Keywords high purity; low conductivity; on-line; pH; calculated pH ICS Code ICS Number Code 71.040.50 (Physicochemical methods of analysis) DOI: 10.1520/D5128-14 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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