ASTM-D2791 Historical Revision Information
Standard Test Method for On-line Determination of Sodium in Water

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Standard Test Method for On-Line Determination of Sodium in Water


1.1 This test method covers the on-line determination of trace amounts of sodium in water using an ion-selective electrode.

1.2 This test method is based on on-line application of the sodium ion electrode as reported in the technical literature (). It is generally applicable over the range of 0.01 to 10 000 g/L.

1.3 The analyst should be aware that adequate collaborative data for precision and bias statements as required by Practice D 2777 are not provided. See Section for details.

1.4 The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are for information only.

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. For specific hazard statements see Section 6.

Significance and Use

Sodium is a pervasive contaminant and it is the first cation to break through deionization equipment. This test method allows measurement of micrograms per litre (parts per billion) concentrations of sodium in water to monitor low-sodium water sources for indications of contamination or proper operation. Applications include monitoring makeup systems, condensers, condensate polishers, feedwater, boilerwater, and steam.

This test method is more sensitive and selective than conductivity measurements on high purity samples.


on-line measurement; ion-selective electrode; specific ion; ICS Number Code 13.060.50 (Examination of water for chemical substances)

To find similar documents by ASTM Volume:

11.01 (Water (I))

To find similar documents by classification:

13.060.50 (Examination of water for chemical substances)

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Document Number


Revision Level




Modification Type

Revision with Title Change

Publication Date

Feb. 1, 2007

Document Type

Test Method

Page Count

6 pages

Committee Number