1、Designation:D298901(Reapproved 2022)Standard Test Method forAcidity-Alkalinity of Halogenated Organic Solvents andTheir Admixtures1This standard is issued under the fixed designation D2989;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revis
2、ion,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.Scope1.1 This test method cover
3、s the determination of acidity inhalogenated organic solvents and admixtures thereof.Thealkalinity may be determined utilizing Test Methods D2106,bysubstituting the end point measured at pH 7 by bromothymolblue or pH meter.1.2 The values stated in SI units are to be regarded asstandard.No other unit
4、s of measurement are included in thisstandard.1.3 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 applicabili
5、ty of regulatory limitations prior to use.Specific precautionary statements are given in Section 7.1.4 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
6、 Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D2106 Test Methods for Determination of Amine AcidAcceptance(Alkalinity)of Halogenated Organic SolventsD2110 Test Method for pH of Water Ex
7、tractions of Haloge-nated Organic Solvents and Their Admixtures3.Summary of Test Method3.1 A sample of halogenated solvent or admixture is mea-sured for pH using Test Method D2110.If the pH of the sampleis above 7.0,the alkalinity is determined using Test MethodsD2106(to an end point of pH 7).If the
8、 pH is below 7.0,thefree acid content of the halogenated organic solvent or admix-ture is determined after water extraction using Procedure A,orcan be determined directly using Procedure B.3.1.1 Procedure A,using glass electrode pH meter,or3.1.2 Procedure B,anhydrous methanolic sodium hydroxidetitra
9、tion.4.Significance and Use4.1 This test method can be used to establish manufacturingand purchasing specifications.It can also be used to determinethe condition of solvents in use.5.Apparatus5.1 Separatory Funnel,250 mL.5.2 Graduated Cylinder,100 mL.5.3 Volumetric Pipets,1 mL,10 mL,25 mL,50 mL.5.4
10、Beaker,100 mL.5.5 Borosilicate or Stainless Steel Beaker,2 L.5.6 Erlenmeyer Flask,100 mL.5.7 pH Meter with pH Electrodes.5.8 Buret,10 mL.5.9 Volumetric Flask,100 mL,1 L.5.10 Micro Buret,5 mL,Class A or Syringe,100 L.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Un
11、less otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may be1This test method is under the jurisdiction of ASTM Committee D26 onHalog
12、enated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved May 1,2022.Published May 2022.Originallyapproved in 1971.Last previous edition approved in 2016 as D2989-01(2016)DOI:10.1520/D2989-01R22.2For referenc
13、ed 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 So
14、ciety,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.Pharmacopeial Convention,Inc.(USP),Rockville,MD.Copyright AST
15、M 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
16、,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1used,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 WaterPrepare neutral,distilled or deionized water asfollows:Boil 1 L of distilled or deionized water for 5 min in aborosilicate glass or stainless steel container,then cover andcool to room temperature.Titrate to a pH of 7.0 to 7.3
