1、Designation:D5917151Standard Test Method forTrace Impurities in Monocyclic Aromatic Hydrocarbons byGas Chromatography and External Calibration1This standard is issued under the fixed designation D5917;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase 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 cove
3、rs the determination of the totalnonaromatic hydrocarbons and trace monocyclic aromatichydrocarbons in toluene,mixed xylenes,and p-xylene by gaschromatography.The purity of toluene,mixed xylenes,orp-xylene can also be calculated.Calibration of the gas chro-matographic system is done by the external
4、standard calibra-tion technique.A similar test method,using the internalstandard calibration technique,is Test Method D2360.1.2 Total aliphatic hydrocarbons containing 1 through 10carbon atoms(methane through decanes)can be detected bythis test method at concentrations ranging from 0.001 to 2.500wei
5、ght%.1.2.1 A small amount of benzene in mixed xylenes orp-xylenes may not be distinguished from the nonaromatics andthe concentrations are determined as a composite(see 6.1).1.3 Monocyclic aromatic hydrocarbon impurities containing6 through 10 carbon atoms(benzene through C10aromatics)can be detecte
6、d by this test method at individual concentrationsranging from 0.001 to 1.000 weight%.1.4 In determining the conformance of the test results toapplicable specifications,results shall be rounded off in accor-dance with the rounding-off method of Practice E29.1.5 The values stated in SI units are to b
7、e regarded asstandard.No other units of measurement are included in thisstandard.1.6 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 deter
8、mine the applica-bility of regulatory limitations prior to use.For specific hazardstatement,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D841 Specification for Nitration Grade TolueneD2360 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas ChromatographyD3437 Pract
9、ice for Sampling and Handling Liquid CyclicProductsD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD5136 Speci
10、fication for High Purity p-XyleneD5211 Specification for Xylenes for p-Xylene FeedstockD6526 Test Method for Analysis of Toluene by CapillaryColumn Gas ChromatographyD6563 Test Method for Benzene,Toluene,Xylene(BTX)Concentrates Analysis by Gas ChromatographyD6809 Guide for Quality Control and Qualit
11、y 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-shipsE691 Practice for Con
12、ducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct r
13、esponsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane and TheirDerivatives.Current edition approved Feb.1,2015.Published May 2015.Originallyapproved in 1996.Last previous edition approved in 2012 as D5917 12.DOI:10.1520/D5917-15E01.2For referenced ASTM standards,visit the ASTM w
14、ebsite,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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Dri
15、ve,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 See Terminology D4790 for definitions of terms used inthis test method.3.2 Mixed xylenes are a mixture of C8aromatics includingm-xylene,o-xylene
16、,and p-xylene.Industry convention in-cludes ethylbenzene as a mixed xylene though ethylbenzeneis not technically a xylene.Styrene is excluded.4.Summary of Test Method4.1 A repeatable volume of the specimen to be analyzed isprecisely injected into a gas chromatograph equipped with aflame ionization detector(FID).The peak area of each impurityis measured.Concentration of each impurity is determinedfrom the linear calibration curve of peak area versus concen-tration.Purity by gas chromatography(GC)
