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    ASTM D5543 - 21

    Standard Test Method for Low-Level Dissolved Oxygen in Water

    Active Standard ASTM D5543 | Developed by Subcommittee: D19.03

    Book of Standards Volume: 11.01


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    Significance and Use

    5.1 Dissolved oxygen is detrimental in certain boiler and steam cycles because it may accelerate corrosion. Concentrations above 10 μg/L are unacceptable in many high-pressure boiler systems. The efficiency of dissolved oxygen removal from boiler feedwater by chemical or mechanical means, or both, is determined by measuring the concentration before and after the process. The measurement is also made to check for air leakage into the boiler system.

    5.2 The oxygen treatment method for boiler corrosion reduction requires injection of oxygen into the boiler feedwater. The resulting oxygen level is monitored for control purposes.

    1. Scope

    1.1 This test method covers the rapid determination of low-level (<100 μg/L) dissolved oxygen in thermal-cycle steam condensate, deaerated boiler feedwater, boiler water, and deaerated deionized water. Color comparators allow the estimation of concentrations ranging from 0 to 100 μg/L (ppb) oxygen.

    1.2 This test method may be applicable to electronic-grade, pharmaceutical-grade, and other high-purity waters, although these were not addressed in the collaborative study.

    1.3 It is the user’s responsibility to ensure the validity of this test method for waters of untested matrices.

    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, 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.


    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

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

    D3370 Practices for Sampling Water from Flowing Process Streams

    D5463 Guide for Use of Test Kits to Measure Inorganic Constituents in Water

    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


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D5543-21

    Citation Format

    ASTM D5543-21, Standard Test Method for Low-Level Dissolved Oxygen in Water, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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