ASTM_D_6919_-_17.pdf

Designation:D691917Standard Test Method forDetermination of Dissolved Alkali and Alkaline EarthCations and Ammonium in Water and Wastewater by IonChromatography1This standard is issued under the fixed designation D6919;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 This test method is valid for the simultaneous determi-nation of the inorganic alkali and alkaline earth cations,lithium,sodium,potassium,magnesium,and calcium,as wellas the ammonium cation in reagent water,drinking water,andwastewaters by suppressed and nonsuppressed ion chromatog-raphy.1.2 The anticipated range of the test method is 0.05200mg/L.The specific concentration ranges tested for this testmethod for each cation were as follows(measured in mg/L):Lithium0.410.0Sodium4.040.0Ammonium0.410.0Potassium1.220.0Magnesium2.420.0Calcium4.040.01.2.1 The upper limits may be extended by appropriatedilution or by the use of a smaller injection volume.In somecases,using a larger injection loop may extend the lower limits.It is the responsibility of the user to ensure the validity of thistest method for concentrations if the range is extended.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 It is the users responsibility to ensure the validity ofthese test methods for waters of untested matrices.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For hazardsstatements specific to this test method,see 8.3.1.6 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:2D1129 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 ConduitsD3856 Guide for Management Systems in LaboratoriesEngaged in Analysis of WaterD4210 Practice for Intralaboratory Quality Control Proce-dures and a Discussion on Reporting Low-Level Data(Withdrawn 2002)3D5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisD5905 Practice for the Preparation of Substitute Wastewater3.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 continuing calibration blank,na solution containingno analytes(of interest)which is used to verify blank responseand freedom from carryover.3.2.2 continuing calibration verification,na solution(orset of solutions)of known concentration used to verify freedomfrom excessive instrumental drift;the concentration is to coverthe range of calibration curve.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 2003.Last previous edition approved in 2009 as D6919 09.DOI:10.1520/D6919-17.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.*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 4.Summary of Test Method4.1 Inorganic cations and the ammonium cation,hereafterreferred to as ammonium,are determined by ion chromatog-raphy in water and wastewater samples from a fixed samplevolume,typically 1050 L.The cationic analytes are sepa-rated using a cation-exchange material,which is packed intoguard and analytical columns.Adilute acid solution is typicallyused as the eluent.4.1.1 The separated