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ASTM D6569-23

Current Revision

Standard Test Method for On-Line Measurement of pH

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1.1 This test method covers the continuous determination of pH of water by electrometric measurement using the glass, the antimony or the ion-selective field-effect transistor (ISFET) electrode as the sensor.

1.2 This test method does not cover measurement of samples with less than 100 μS/cm conductivity. Refer to Test Method D5128.

1.3 This test method does not cover laboratory or grab sample measurement of pH. Refer to Test Method D1293.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 pH is a measure of the hydrogen ion activity in water. It is a major parameter affecting the corrosivity and scaling properties of water, biological life in water and many applications of chemical process control. It is therefore important in water purification, use and waste treatment before release to the environment.

5.2 On-line pH measurement is preferred over laboratory measurement to obtain real time, continuous values for automatic control and monitoring purposes.

SDO ASTM: ASTM International
Document Number D6569
Publication Date April 1, 2023
Language en - English
Page Count 7
Revision Level 23
Supercedes
Committee D19.03
Publish Date Document Id Type View
April 1, 2023 D6569-23 Revision
Feb. 1, 2014 D6569-14 Revision
June 1, 2005 D6569-05 Revision
June 10, 2000 D6569-00 Revision
May 1, 2009 D6569-05R09 Reaffirmation