ASTM International - ASTM D6569-05(2009)
Standard Test Method for On-Line Measurement of pH1
|Publication Date:||1 May 2009|
|ICS Code (Physicochemical methods of analysis):||71.040.50|
significance And Use:
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... View More
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.
On-line pH measurement is preferred over laboratory measurement to obtain real time, continuous values for automatic control and monitoring purposes.View Less
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 D 5128.
1.3 This test method does not cover laboratory or grab sample measurement of pH. Refer to Test Method D 1293.
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 and health practices and determine the applicability of regulatory limitations prior to use.