1、Designation:D7504151Standard 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 th
2、e 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.1NOTEResearch Report information was added editorially in September 2015.1.Scope*1.1 This test method c
3、overs 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.Sim
4、ilar 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 A small amount of benzene in toluene,ethylbenzene,p-xylene,o-xylene,styrene and mixed xylenes may not bedis
5、tinguished from the non-aromatics and the concentrationsare determined as a composite(see 6.1).1.3 The limit of detection(LOD)is 0.0002 wt%and limitof quantitation(LOQ)is 0.0006 wt%for impurities in toluene,mixed xylenes,p-xylene,o-xylene,ethylbenzene,benzene,andstyrene.1.4 In determining the confor
6、mance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard d
7、oes 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 Standa
8、rds:2D841 Specification for Nitration Grade TolueneD1555M Test Method for Calculation of Volume and Weightof Industrial Aromatic Hydrocarbons and CyclohexaneMetricD2360 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas ChromatographyD3437 Practice for Sampling and Handling L
9、iquid CyclicProductsD3797 Test Method for Analysis of o-Xylene by Gas Chro-matography(Withdrawn 2014)3D4492 Test Method for Analysis of Benzene by Gas Chro-matographyD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD5060 Test Method for Determining Impurities in High-Purity Ethylbenzen
10、e 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
11、 CalibrationD6229 Test Method for Trace Benzene in HydrocarbonSolvents by Capillary Gas ChromatographyD6563 Test Method for Benzene,Toluene,Xylene(BTX)Concentrates Analysis by Gas ChromatographyD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-t
12、erialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cy
13、clohexane and TheirDerivatives.Current edition approved July 1,2015.Published July 2015.Originally approvedin 2009.Last previous edition approved in 2012 as D7504 12.DOI:10.1520/D7504-15E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servicea
14、stm.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 Internationa
15、l,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE260 Practice for Packed Column Gas ChromatographyE355 Practice for Gas Chromatography Terms and Relation-shipsE691 Practice for Conducting an I
16、nterlaboratory 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 definitions of terms used inthis test method.4.Summary of Test Method4.1 The specimen to be analyzed is injected into a gaschromatograph equipped with a flame ionization detector(FID)and a capillary column.The peak area of
