ASTM_D_1179_-_16_2021e1.pdf

Designation:D117916(Reapproved 2021)1Standard Test Methods forFluoride Ion in Water1This standard is issued under the fixed designation D1179;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.1NOTEThe WTO caveat was added editorially in December 2021.1.Scope1.1 These test methods2cover the determination of fluorideion in water.The following two test methods are given:SectionsTest Method ADistillation7 to 13Test Method BIon Selective Electrode14 to 211.2 Test MethodAcovers the accurate measurement of totalfluoride in water through isolation of the fluoride by distillationand subsequent measurement in the distillate by use of the ionselective electrode(ISE)method.The procedure covers therange from 0.1 to 2.6 mg/L of fluoride.1.3 Test Method B covers the accurate measurement ofsimple fluoride ion in water by means of an ion selectiveelectrode.With this test method,distillation is eliminatedbecause the electrode is not affected by the interferencescommon to colorimetric procedures.Concentrations of fluoridefrom 0.1 to 1000 mg/L may be measured.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.For a specific precautionary statement,see 12.1.2.1.6 FormerTestMethod A,SPADNSPhotometricProcedure,was discontinued.Refer to Appendix X1 forhistorical information.1.7 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:3D1066 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 ProcessStreamsD4127 Terminology Used with Ion-Selective ElectrodesD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminologies D1129 and D4127.4.Significance and Use4.1 Simple and complex fluoride ions are found in naturalwaters.Fluoride forms complexing ions with silicon,aluminum,and boron.These complexes may originate from theuse of fluorine compounds by industry.4.2 Fluoridation of drinking water to prevent dental caries ispracticed by a large number of communities in this country.Fluoride is monitored to assure that an optimum treatmentlevel,usually near 1 mg/L,is maintained.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shall1These 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 Nov.1,2021.Published December 2021.Originallyapproved in 1951.Last previous edition approved in 2016 as D1179 16.DOI:10.1520/D1179-16R21E01.2Bellack,E.,“Simplified Fluoride Distillation Method,”Journal of the AmericanWater Works Association,Vol 50,1958,p.530.3For 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.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.1?conform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where suchspecifications are available.4Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall