ASTM_D_5543_-_21.pdf

Designation:D554321Standard Test Method forLow-Level Dissolved Oxygen in Water1This standard is issued under the fixed designation D5543;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the rapid determination oflow-level(100 g/L)dissolved oxygen in thermal-cyclesteam condensate,deaerated boiler feedwater,boiler water,anddeaerated deionized water.Color comparators allow the esti-mation of concentrations ranging from 0 to 100 g/L(ppb)oxygen.1.2 This test method may be applicable to electronic-grade,pharmaceutical-grade,and other high-purity waters,althoughthese were not addressed in the collaborative study.1.3 It is the users responsibility to ensure the validity of thistest method for waters of untested matrices.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Flowing ProcessStreamsD5463 Guide for Use of Test Kits to Measure InorganicConstituents in WaterD5540 Practice for Flow Control and Temperature Controlfor On-Line Water Sampling and Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.4.Summary of Test Method4.1 The tip of a partially evacuated sealed ampoule isbroken while submerged in a flowing water sample.Thesample is drawn into the ampoule where it reacts instanta-neously with the oxygen-sensitive indicator(leuco form ofRhodazine D)to produce a reddish violet color whose intensityis proportional to the concentration of dissolved oxygen.35.Significance and Use5.1 Dissolved oxygen is detrimental in certain boiler andsteam cycles because it may accelerate corrosion.Concentra-tions above 10 g/L are unacceptable in many high-pressureboiler systems.The efficiency of dissolved oxygen removalfrom boiler feedwater by chemical or mechanical means,orboth,is determined by measuring the concentration before andafter the process.The measurement is also made to check forair leakage into the boiler system.5.2 The oxygen treatment method for boiler corrosionreduction requires injection of oxygen into the boiler feedwa-ter.The resulting oxygen level is monitored for controlpurposes.6.Interferences6.1 Color,turbidity,and oxidizing impurities interfere inthis test method to yield high results.If the sample is colored1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of Water.Current edition approved July 1,2021.Published July 2021.Originally approvedin 1994.Last previous edition approved in 2015 as D5543 15.DOI:10.1520/D5543-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Spokes,G.N.,Dissolved Oxygen in Water Measurement and Standardization,EPRI PWR Plant Chemists Meeting,San Diego,CA,Nov.1720,1992.Copiesobtainable from CHEMetrics Inc.,4295 Catlett Rd.,Midland,VA 22728,https:/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1or turbid or contains oxidizing impurities,the amount ofinterference that may be contributed by such effects must bedetermined independently prior to using this test method.6.2 Easily reduced metal ions may interfere in this testm