ASTM_D_7504_-_21.pdf

Designation:D750421Standard Test Method forTrace Impurities in Monocyclic Aromatic Hydrocarbons byGas Chromatography and Effective Carbon Number1This standard is issued under the fixed designation D7504;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.1.Scope*1.1 This test method covers the determination of totalnonaromatic hydrocarbons and monocyclic aromatic hydrocar-bons in benzene,toluene,ethylbenzene,p-xylene,o-xylene,styrene and mixed xylenes by gas chromatography.The purityof benzene,toluene,ethylbenzene,p-xylene,o-xylene,styreneand mixed xylenes is also calculated.Similar test methods,using the internal standard calibration technique and theexternal standard calibration technique,are Test MethodsD2360,D3797,D4492,D5060,D5135,D5917,and D6563respectively.1.2 The limit of detection(LOD)is 0.0002 mass%and limitof quantitation(LOQ)is 0.0006 mass%for impurities intoluene,mixed xylenes,p-xylene,o-xylene,ethylbenzene,benzene,and styrene.1.3 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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.1.6 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:2D1555M Test Method for Calculation of Volume and Weightof Industrial Aromatic Hydrocarbons and CyclohexaneMetricD2360 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography(With-drawn 2016)3D3437 Practice for Sampling and Handling Liquid CyclicProductsD3797 Test Method for Analysis of o-Xylene by Gas Chro-matography(Withdrawn 2014)3D4492 Test Method for Analysis of Benzene by Gas Chro-matography(Withdrawn 2018)3D4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD5060 Test Method for Determining Impurities in High-Purity Ethylbenzene by Gas ChromatographyD5135 Test Method for Analysis of Styrene by CapillaryGas ChromatographyD5136 Specification for High Purity p-XyleneD5211 Specification for Xylenes for p-Xylene FeedstockD5917 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography andExternal CalibrationD6563 Test Method for Benzene,Toluene,Xylene(BTX)Concentrates Analysis by Gas Chromatography(With-drawn 2018)3D6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE260 Practice for Packed Column Gas ChromatographyE355 Practice for Gas Chromatography Terms and Relation-ships1This 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 July 1,2021.Published August 2021.Originallyapproved in 2009.Last previous edition approved in 2020 as D7504 20.DOI:10.1520/D7504-21.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright 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.1E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120043.Terminology3.1 See Terminology D4790 for