ASTM_D_513_-_16.pdf

Designation:D51316Standard Test Methods forTotal and Dissolved Carbon Dioxide in Water1This standard is issued under the fixed designation D513;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.Scope*1.1 These test methods cover the measurement of total ordissolved carbon dioxide present as carbon dioxide(CO2),carbonic acid,bicarbonate ion,and carbonate ion in water:RangeSectionsTest Method A(Gas Sensing Electrode)2 to 800 mg/L8 to 15Test Method B(CO2Evolution,CoulometricTitration)5 to 800 mg/L16 to 241.2 Carbon dioxide may also be detected from carbonatespresent in particulates in samples.1.3 Test Method A is applicable to various natural watersand brines.1.4 Test Method B is applicable to natural waters,brines,and various industrial waters as delineated in 16.4.1.5 It is the users responsibility to ensure the validity ofthese test methods on waters of untested matrices.1.6 Several test methods were discontinued from this stan-dard in 1988.Refer to Appendix X1 for historical information.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1293 Test Methods for pH of 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 D1129.4.Significance and Use4.1 Carbon dioxide is a respiration product of plants andanimals and a decomposition product of organic matter andcertain minerals.The atmosphere averages about 0.04 vol%ofCO2.Surface waters generally contain less than 10 mg/L,except at local points of abnormal organic or mineral decom-position;however,underground water,particularly deepwaters,may contain several hundred mg/L.4.2 When dissolved in water,CO2contributes significantlyto corrosion of water-handling systems.This is particularlytroublesome in steam condensate systems.Loss of CO2froman aqueous system can disturb the carbonate equilibrium andresult in calcite encrustation of confining surfaces.Scaling ofwater heaters is a good example.Because of the delicatebalance between corrosion and encrustation tendencies,muchcare must be given to control of CO2and related species inwater systems.Recarbonation of municipal supplies duringfinal stages of softening and amine neutralization of steamcondensate are applied for these purposes.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on Analytical1These 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 June 15,2016.Published June 2016.Originallyapproved in 1938.Last previous edition approved in 2011 as D513 111.DOI:10.1520/D0513-16.2For 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 States1 Reagents of the American Chemical Society.3Other gradesmay be used,provided it is first ascertained that the reagent isof sufficiently high purity to permit its use without lesseningthe accuracy of the determination.5.2 Unless otherwise indicated,references to water shall beunderstood to mean water conforming to Type I of Specifica-tion D1193.Other reagent water types may be used provided itis first ascertained that the water is of sufficiently high purity topermit its use without adversely affecting the bias and precisionof the test method.Additionally,for those test methodsrequiring water free of CO2,refer to 8.2 of Practice E200.6.Precautions6.1 WarningCarbon dioxide is easily lost from solutionduring transit and sto