ASTM_D_2106_-_07_2012.pdf

Designation:D210607(Reapproved 2012)Standard Test Methods forDetermination of Amine Acid Acceptance(Alkalinity)ofHalogenated Organic Solvents1This standard is issued under the fixed designation D2106;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 Department of Defense.1.Scope1.1 These test methods,where applicable,cover the deter-mination of the acid acceptance of halogenated organic sol-vents due to the presence therein of an organic amine titratableby standard acid.These test methods are suitable for samples of0.001 to 0.02 weight percent(10 200 ppm)alkalinity asNaOH.Two test methods are covered as follows:1.1.1 Test Method A pH Method,and1.1.2 Test Method B Indicator Method.1.1.3 Test Method CGC Method.1.2 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.2.Referenced Documents2.1 ASTM Standards:2D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas ChromatographyE70 Test Method for pH of Aqueous Solutions With theGlass ElectrodeE200 Practice for Preparation,Standardization,and Storageof Standard and Reagent Solutions for Chemical Analysis3.Terminology3.1 Definitions:3.1.1 amine acid acceptancethe degree to which an or-ganic amine present in the halogenated organic solvent iscapable of absorbing or neutralizing acid generated by thesolvent or introduced into it from an external source.4.Significance and Use4.1 This test method is useful for the determination of theamount of acid acceptance contributed by amines or bases ascompared to other acid-accepting compounds.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 distilled water or water ofequal purity.Additional requirements are specified in 8.1 and12.1.TEST METHOD ApH METHOD6.Summary of Test Method6.1 The amine acid acceptance of the halogenated organicsolvent is determined,after extraction into a volume of waterpreadjusted to a pH of 3.9,by titrating with standard acid to apH of 3.9.The extraction is performed either by stirring theimmiscible liquids mechanically or by shaking the immisciblelayers of liquids manually.7.Apparatus7.1 pH Meter,equipped with a pH indicating electrode andpH reference electrode or combination electrode.7.2 Stirrer,electric stirring bar,air-driven or magnetic.1These test methods are under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and are the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Sept.1,2012.Published November 2012.Originallyapproved in 1962.Last previous edition approved in 2007 as D2106 07.DOI:10.1520/D2106-07R12.2For 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.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Reagents8.1 WaterAdjust the pH of 1 L(or any convenientquantity)of water to 3.9.Boil 1 L of distilled water for 5 minin a borosilicate glass or stainless steel container,then coverand cool to room temperature.Titrate a 50-mL aliquot to a pHof 3.8 to 4.0 with 0.01 N hydrochloric acid(HCl)(or 0.01 NNaOH if the pH is below 3.8).From this titer,calculate thevolume of 0.01 N HCl(or NaOH)required to adjust the pH ofthe remaining 950 mL of boiled distilled water to a pH of 3.8to 4.0.The calculation is as follows:950503titer(1)Add the calculated amount of 0.01 N HCl(or NaOH)together with the titrated 50 mL aliquot of water to the 950 mLstock and mix thoroughly.Determine th