Standard Active Last Updated: May 09, 2024 Track Document
ASTM D6504-11(2024)

Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water

Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water D6504-11R24 ASTM|D6504-11R24|en-US Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water Standard new BOS Vol. 11.01 Committee D19
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Significance and Use

5.1 Cation conductivity provides one of the most sensitive and dependable on-line means of detecting anionic contamination in the boiler/steam cycle, such as chlorides, sulfates, nitrates, bicarbonates, and organic acids, such as formic and acetic.

5.2 High sensitivity is provided by intentionally eliminating the pH adjusting treatment chemical(s), for example, ammonia and amines, from the sample and converting remaining salt contaminants into their acid forms which are approximately three times as conductive.

5.3 Guidelines on cation conductivity limits for various cycle chemistry and boiler types have been established by EPRI (2-4) and by ASME (5 and 6).

5.4 The sample effluent from the cation exchange column also may be used, and in some cases is preferred, for ion chromatography or other anion measurements.


1.1 This practice describes continuous sample conditioning by hydrogen ion exchange and measurement by electrolytic conductivity. It is commonly known as cation conductivity measurement in the power industry although it is actually an indication of anion contamination in high purity water samples. Measurements are typically in a range less than 1 μS/cm.

1.2 The actual conductivity measurements are made using Test Method D5391.

1.3 This practice does not provide for separate determination of dissolved carbon dioxide. Refer to Test Method D4519.

1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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.

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Book of Standards Volume: 11.01
Developed by Subcommittee: D19.03
Pages: 6
DOI: 10.1520/D6504-11R24
ICS Code: 13.060.60