ASTM D2791 - 13

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

    Active Standard ASTM D2791 | Developed by Subcommittee: D19.03

    Book of Standards Volume: 11.01


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    ASTM D2791

    Significance and Use

    4.1 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.

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

    1. Scope

    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 (1-3).2 It is generally applicable over the range of 0.01 to 10 000 μg/L.

    1.3 The analyst should be aware that adequate collaborative data for precision and bias statements as required by Practice D2777 are not provided. See Section 16 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.

    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. For specific hazard statements see Section 6.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1066 Practice for Sampling Steam

    D1129 Terminology Relating to Water

    D1193 Specification for Reagent Water

    D1293 Test Methods for pH of Water

    D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water

    D3370 Practices for Sampling Water from Closed Conduits

    D3864 Guide for On-Line Monitoring Systems for Water Analysis

    D5540 Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis


    ICS Code

    ICS Number Code 13.060.50 (Examination of water for chemical substances)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D2791-13

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