ASTM_D_848_-_18.pdf

Designation:D84818Standard Test Method forAcid Wash Color of Industrial Aromatic Hydrocarbons1This standard is issued under the fixed designation D848;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.Scope1.1 This test method covers the determination of the acidwash color of benzene,toluene,xylenes,refined solventnaphthas,and similar industrial aromatic hydrocarbons.1.2 The values stated in SI units are to be regarded asstandard.No other units 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 applicability of regulatory limitations prior to use.For specific hazard statements,see Sections 8 and 12.1.1.4 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 Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3437 Practice for Sampling and Handling Liquid CyclicProductsD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terials2.2 Other Document:3OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.12003.Terminology3.1 See Terminology D4790 for definitions of terms used inthis test method.4.Summary of Test Method4.1 Amixture of the aromatic hydrocarbon and sulfuric acidis vigorously shaken and the color of the acid layer is comparedwith that of color standards prepared from CoCl2and FeCl3.5.Significance and Use5.1 This test method is suitable for setting specifications onthe materials referenced in 1.1.It may also be used as aninternal quality control tool and in development or researchwork.5.2 The color developed in the acid layer gives an indicationof impurities which if sulfonated would cause the material tobe discolored.6.Apparatus6.1 ContainersforColorStandardsClearandunblemished,clean,French square,flint-glass,flat-bottom,glass-stoppered,30-mL capacity bottles holding 31 to 33 mLwhen filled to the neck.The bottles shall be labeled with thereference number of the color standard they contain(see 11.2).6.2 Test ContainersContainers exactly like those de-scribed in 6.1 except that each French square bottle shall bemarked by etching to show when the bottle contains thevolume of 7 and 28 mL,respectively.Colored crayons andsimilar markers shall not be used for marking the bottles.7.Reagents7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended that1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane andTheir Derivatives.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 1945.Last previous edition approved in 2014 as D848 14.DOI:10.1520/D0848-18.2For 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.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM 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,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 all reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.7.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean distilled water,Type I orII as described in Specification D1193.7.3 Cobalt Chloride(CoCl2 6H2O).7.4 Ferric Chloride(FeCl3 6H2O).7.5 Hydrochloric Acid(