ASTM_D_512_-_12.pdf

Designation:D51212Standard Test Methods forChloride Ion In Water1This standard is issued under the fixed designation D512;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 chlorideion in water,wastewater(Test Method C only),and brines.Thefollowing three test methods are included:SectionsTest Method A(Mercurimetric Titration)7 to14Test Method B(Silver Nitrate Titration)15 to 21Test Method C(Ion-Selective Electrode Method)22 to 291.2 Test Methods A,B,and C were validated under PracticeD2777 77,and only Test Method B conforms also to PracticeD2777 86.Refer to Sections 14,21,and 29 for furtherinformation.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For a specifichazard statement,see 26.1.1.1.5 A former colorimetric test method was discontinued.Refer to Appendix X1 for historical information.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 ConduitsD4127 Terminology Used with Ion-Selective ElectrodesD5810 Guide for Spiking into Aqueous SamplesD5847 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 DefinitionsFor definitions of terms used in these testmethods,refer to Terminologies D1129 and D4127.4.Significance and Use4.1 Chloride ion is under regulation in waste water,andmust,therefore,be measured accurately.It is highly detrimen-tal to high-pressure boiler systems and to stainless steel,somonitoring is essential for prevention of damage.Chlorideanalysis is widely used as a tool for estimating the cycles ofconcentration,such as in cooling tower applications.Process-ing waters and pickling solutions used in the food processingindustries also require dependable methods of analysis forchloride.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 AnalyticalReagents of the American Chemical Society,where suchspecifications are available.3Other 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 Water Unless otherwise indicated,referencesto water shall be understood to mean Type I reagent waterconforming to Specification D1193.Other reagent water typesmay be used provided it is first ascertained that the water is ofsufficiently high purity to permit its use without adversely1These 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 15,2012.Published July 2012.Originallyapproved in 1938.Last previous edition approved in 2010 as D512 10.DOI:10.1520/D0512-12.2For 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.3Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmaceutical Convention,Inc.(USPC),Rockville,MD.*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 affecting the precision and bias of the test method.Type IIwater was specified at the time of round robin testing of thistest method.6.Sampling6.1 Collect the sample in accordance with Practice D1066and Practices D3370,as applicable.TEST METHOD AMERCURIMETRICTITRATION47.Scope7.1 This test method can be used to determine chloride ionin water,provided interfer