ASTM_D_2522_-_03_2008e2.pdf

Designation:D252203(Reapproved 2008)2Standard Test Method forChlorine Content of Polybutenes Used for ElectricalInsulation1This standard is issued under the fixed designation D2522;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.1NOTEThe mercury warning was editorially added in April 2009.2NOTEIn 7.7,20 L was changed to 2 L editorially in August 2009.1.Scope1.1 This test method describes the determination of the totalchloride content of polybutenes used for electrical insulation.1.2 WarningMercury has been designated by EPA andmany state agencies as a hazardous material that can causecentral nervous system,kidney,and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury-containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAs website(http:/www.epa.gov/mercury/faq.htm)for additional informa-tion.Users should be aware that selling mercury or mercury-containing products,or both,in your state may be prohibited bystate law.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 limitations prior to use.For specific hazardsinformation,see Section 8.2.Referenced Documents2.1 ASTM Standards:2D878 Test Method for Inorganic Chlorides and Sulfates inInsulating OilsD1193 Specification for Reagent Water3.Summary of Test Method3.1 Organically bound chlorine is converted into sodiumchloride by reaction with sodium biphenyl solution.Thesodium chloride formed is extracted with dilute nitric acid,andthe chlorine content of the aqueous phase is determined bypotentiometric titration.4.Significance and Use4.1 Chlorine is normally present in polybutenes in smallamounts,usually below 50 ppm,as organically bound chlorine.Inorganic chloride is normally not present.NOTE1The qualitative presence or absence of inorganic chloride maybe tested by Test Method D878.5.Interferences5.1 The presence of substances which form insoluble silvercompounds,such as sulfides,will give high results.Suchsubstances are not normally present in polybutenes.6.Apparatus6.1 Separatory Funnel,250-mL.6.2 Potentiometeric Titrimeter,automatic recording,ormanual.6.3 Electrodes:6.3.1 Silver and glass electrode combination is preferred.6.3.2 A silver electrode with a mercurous sulfate referenceelectrode is an acceptable alternative.6.4 Microburet,5-mL,with 0.01-mL divisions.7.Reagents7.1 Purity of ReagentsUse reagent grade chemicals in alltests.Unless otherwise indicated,it is intended that all reagentsshall conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society,wheresuch specifications are available.3Other grades may be used,1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.06 on Chemical Test.Current edition approved May 1,2008.Published June 2008.Originallyapproved in 1969.Last previous edition approved in 2003 as D2522 03.DOI:10.1520/D2522-03R08E02.2For 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 provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.7.2 Purity of Water Unless otherwise indicated,referencesto water shall be understood to mean reagent grade water asdefined by Type I conforming to Specifications D1193.7.3 Dilute Nitric Acid(2.1 M)Dilute 134 mL of concen-trated nitric acid to 1.0 L with water.7.4 Isopropyl Alcohol.7.5 Silver Nitrate,Standard Solution(0.025 N)Weighaccurately 0.4247 g of silver nitrate(AgNO3).Transfer it to a1-L volumetric flask and add water to dissolve.Add 3.0 mL ofconcentrated nitric acid(HNO3,relative density(specificgravity)1.42)and then add water to the 1-L mark of thevolumetric flask.Standardize this solution against a purechloride standard.Check the solution a