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ASTM D6504-07

Historical Revision

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

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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 S/cm.

1.2 The actual conductivity measurements are made using Test Method D 5391.

1.3 This practice does not provide for separate determination of dissolved carbon dioxide. Refer to Test Methods D 2186 and D 4519.

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.


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.

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.

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

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.

SDO ASTM: ASTM International
Document Number D6504
Publication Date June 15, 2007
Language en - English
Page Count 6
Revision Level 07
Supercedes
Committee D19.03
Publish Date Document Id Type View
May 1, 2011 D6504-11 Revision
June 15, 2007 D6504-07 Revision
June 10, 2000 D6504-00 Revision
April 1, 2024 D6504-11R24 Reaffirmation
Feb. 15, 2016 D6504-11R16E01 Reaffirmation