1、Designation:D298901(Reapproved 2011)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 Department of Defense.1.Scope1.1 This test method covers th
3、e determination of acidity inhalogenated organic solvents and admixtures thereof.Thealkalinity may be determined utilizing Test Method 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 units of
4、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 and health practices and determine the applica-bility of regulatory li
5、mitations prior to use.Specific precau-tionary statements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D2106 Test Methods for Determination of Amine AcidAcceptance(Alkalinity)of Halogenated Organic SolventsD2110 Test Method for pH of Water Extractions of Haloge-nated Organic Solv
6、ents 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 MethodD2106(to an end point of pH 7).If the pH is below 7.0,thefree acid content o
7、f 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 hydroxidetitration.4.Significance and Use4.1 This tes
8、t 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 Beaker,100 mL.5.5 Borosilicate or Stain
9、less 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.Unless otherwise indicated,it is intended
10、 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 beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without l
11、essening 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 a1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the d
12、irectresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Aug.1,2011.Published November 2011.Originallyapproved in 1971.Last previous edition approved in 2006 as D2989 01(2006)1.DOI:10.1520/D2989-01R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcon
13、tact 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 reage
14、nts 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.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Con
15、shohocken,PA 19428-2959.United States1 borosilicate glass or stainless steel container,then cover andcool to room temperature.Titrate to a pH of 7.0 to 7.3 witheither 0.01 N sodium hydroxide(NaOH)solution or 0.01 Nhydrochloric acid(HCl),depending upon whether the initialpH is above or below 7.6.3 Br
16、omothymol Blue Indicator Solution(0.1%)Indicatorsolution may be purchased from a laboratory supply house orprepared as follows:Dissolve 0.1 g of dibromothymol sulfo-nephthalein in 1.6 mL of 0.1 N NaOH solution and dilute to100 mL with methanol.6.4 Sodium Hydroxide Solution(0.01 N),ProcedureADissolve 4 g of sodium hydroxide(NaOH)in boiled,neutral,distilled or deionized water and dilute to 1000 mL.Prepare 0.01 N NaOH solution by diluting 10.0 mL of the 0.1N NaOH to 100 mL with boiled,neutral,disti
