ASTM D5543-21

Standard Test Method for Low-Level Dissolved Oxygen in Water

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.
SCOPE
1.1 This test method covers the rapid determination of low-level (  
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.

General Information

• Status: Published
• Publication Date: 30-Jun-2021
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: D19 - Water
• Drafting Committee: D19.03 - Sampling Water and Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water

Standards Content (Sample)

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.
Designation: D5543 − 21
Standard Test Method for
1
Low-Level Dissolved Oxygen in Water
This standard is issued under the fixed designation D5543; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D2777 Practice for Determination of Precision and Bias of
Applicable Test Methods of Committee D19 on Water
1.1 This test method covers the rapid determination of
D3370 Practices for Sampling Water from Flowing Process
low-level (<100 µg/L) dissolved oxygen in thermal-cycle
Streams
steamcondensate,deaeratedboilerfeedwater,boilerwater,and
D5463 Guide for Use of Test Kits to Measure Inorganic
deaerated deionized water. Color comparators allow the esti-
Constituents in Water
mation of concentrations ranging from 0 to 100 µg/L (ppb)
D5540 Practice for Flow Control and Temperature Control
oxygen.
for On-Line Water Sampling and Analysis
1.2 This test method may be applicable to electronic-grade,
pharmaceutical-grade, and other high-purity waters, although 3. Terminology
these were not addressed in the collaborative study.
3.1 Definitions:
1.3 Itistheuser’sresponsibilitytoensurethevalidityofthis 3.1.1 For definitions of terms used in this standard, refer to
test method for waters of untested matrices. Terminology D1129.
1.4 The values stated in SI units are to be regarded as
4. Summary of Test Method
standard. No other units of measurement are included in this
4.1 The tip of a partially evacuated sealed ampoule is
standard.
broken while submerged in a flowing water sample. The
1.5 This standard does not purport to address all of the
sample is drawn into the ampoule where it reacts instanta-
safety concerns, if any, associated with its use. It is the
neously with the oxygen-sensitive indicator (leuco form of
responsibility of the user of this standard to establish appro-
RhodazineD)toproduceareddishvioletcolorwhoseintensity
priate safety, health, and environmental practices and deter- 3
is proportional to the concentration of dissolved oxygen.
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
5. Significance and Use
dance with internationally recognized principles on standard-
5.1 Dissolved oxygen is detrimental in certain boiler and
ization established in the Decision on Principles for the
steam cycles because it may accelerate corrosion. Concentra-
Development of International Standards, Guides and Recom-
tions above 10 µg/L are unacceptable in many high-pressure
mendations issued by the World Trade Organization Technical
boiler systems. The efficiency of dissolved oxygen removal
Barriers to Trade (TBT) Committee.
from boiler feedwater by chemical or mechanical means, or
both, is determined by measuring the concentration before and
2. Referenced Documents
after the process. The measurement is also made to check for
2
2.1 ASTM Standards:
air leakage into the boiler system.
D1066 Practice for Sampling Steam
5.2 The oxygen treatment method for boiler corrosion
D1129 Terminology Relating to Water
reduction requires injection of oxygen into the boiler feedwa-
D1193 Specification for Reagent Water
ter. The resulting oxygen level is monitored for control
purposes.
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
and is the direct responsibility of Subcommittee D19.03 on Sampling Water and 6. Interferences
Water-Formed Deposits, Analysis of Water for Power Generation and Process Use,
6.1 Color, turbidity, and oxidizing impurities interfere in
On-Line Water Analysis, and Surveillance of Water.
Currentedition approvedJuly 1,2021.PublishedJuly 2021.Originallyapproved this test method to yield high results. If the sample is colored
in 1994. Last previous edition approved in 2015 as D5543 – 15. DOI: 10.1520/
D5543-21.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Spokes, G. N., Dissolved Oxygen in Water Measurement and Standardization,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM EPRI PWR Plant Chemists’ Meeting, San Diego, CA, Nov. 17–20, 1992. Copies
Standards volume information, refer to the standard’s Document Summary page on obtainable from CHEMetrics Inc., 4295 Catlett Rd., Midland, VA 22728, https://
the ASTM website. www.chemetrics.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5543 − 15 D5543 − 21
Standard Test Method for
1
Low-Level Dissolved Oxygen in Water
This standard is issued under the fixed designation D5543; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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’suser’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 safety, health, and healthenvironmental 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
2
2.1 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
3. Terminology
3.1 Definitions—Definitions: For definitions of terms used in this test method, refer to Terminology D1129.
1
TheseThis test methods aremethod is under the jurisdiction of ASTM Committee D19 on Water and areis the direct responsibility of Subcommittee D19.03 on Sampling
Water and Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water.
Current edition approved Feb. 1, 2015July 1, 2021. Published May 2015July 2021. Originally approved in 1994. Last previous edition approved in 20092015 as
D5543 – 09.D5543 – 15. DOI: 10.1520/D5543-15.10.1520/D5543-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5543 − 21
3.1.1 For definitions of terms used in this standard, refer to Terminology D1129.
4. Summary of Test Method
4.1 The tip of a partially evacuated sealed ampoule is broken while submerged in a flowing water sample. The sample is drawn
into the ampoule where it reacts instantaneously with the oxygen-sensitive indicator (leuco form of Rhodazine D) to produce a
3
reddish violet color whose intensity is proportional to the concentration of dissolved oxygen.
5. 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.
6. Interferences
6.1 Color, turbidity, and
...