ASTM_D_888_-_18.pdf

Designation:D88818Standard Test Methods forDissolved Oxygen in Water1This standard is issued under the fixed designation D888;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These test methods cover the determination of dissolvedoxygen in water.Three test methods are given as follows:Range,mg/LSectionsTest Method ATitrimetricProcedureHigh Level1.08 15Test Method BInstrumental ProbeProcedureElectrochemical0.05 to 2016 25Test Method CInstrumental ProbeProcedureLuminescence-BasedSensor0.05 to 2026 311.2 The precision of Test Methods A and B was carried outusing a saturated sample of reagent water.It is the usersresponsibility to ensure the validity of the test methods forwaters of untested matrices.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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.For a specific precautionary statements,see 7.1 and Note 17.1.5 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 Closed ConduitsD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisE200 Practice for Preparation,Standardization,and Storageof Standard and Reagent Solutions for Chemical Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 amperometric systems,nthose instrumental probesthat involve the generation of an electrical current from whichthe final measurement is derived.3.2.2 instrumental probes,ndevices used to penetrate andexamine a system for the purpose of relaying information on itsproperties or composition.3.2.2.1 DiscussionThe term probe is used in these testmethods to signify the entire sensor assembly,includingelectrodes,electrolyte,membrane,materials of fabrications,and so on.3.2.3 potentiometric systems,nthose instrumental probesin which an electrical potential is generated and from which thefinal measurement is derived.4.Significance and Use4.1 Dissolved oxygen is required for the survival andgrowth of many aquatic organisms,including fish.The con-centration of dissolved oxygen may also be associated withcorrosivity and photosynthetic activity.The absence of oxygenmay permit anaerobic decay of organic matter and the produc-tion of toxic and undesirable esthetic materials in the water.5.Purity of Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended that1These test methods are under the jurisdiction of ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.05 on InorganicConstituents in Water.Current edition approved May 1,2018.Published May 2018.Originallyapproved in 1946.Last previous edition approved in 2012 as D888 121.DOI:10.1520/D0888-18.2For 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.*A Summary of Changes section appears at the end of this standardCopyright 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.1 all reagents shall conform to the specifications of the Commit-tee onAnalytical Reagents of theAmerican Chemical Society.3Other grades may be used if it is first ascertained that thereagent is of sufficiently high purity to permit its use withoutlessening the accuracy of the determination.5.1.1 Reag