1、Designation:D652612Standard Test Method forAnalysis of Toluene by Capillary Column GasChromatography1This standard is issued under the fixed designation D6526;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.
2、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 hydrocar-bon impurities typically found in,and the purity of,samplescontaining 98 wt%and gr
3、eater toluene.This test method isapplicable to impurity concentrations in the range of 0.0005 to1.6 wt%.1.2 Monocyclic aromatic hydrocarbons containing 6through 8 carbon atoms,cumene,1,4dioxane,and nonaro-matic aliphatic hydrocarbons containing up to 12 carbon atomscan be detected by this test metho
4、d.The nonaromatic com-pounds are determined as a composite.1.3 The following applies to all specified limits in this testmethod:for purposes of determining conformance with thistest method,an observed value or a calculated value shall berounded off“to the nearest unit”in the last right-hand digituse
5、d in expressing the specification limit,in accordance withthe rounding-off method of Practice 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,
6、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 hazardstatements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D1555M Test
7、 Method for Calculation of Volume and Weightof Industrial Aromatic Hydrocarbons and CyclohexaneMetricD3437 Practice for Sampling and Handling Liquid CyclicProductsD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromat
8、ic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE355 Practice for Gas Chromatography Terms and Relation-shipsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1510 P
9、ractice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 See Terminology D4790 for definitions of terms used inthis test method.4.Summary of Test Method4.1 A portion of the sam
10、ple is injected into a gas chromato-graph using a microlitre syringe at the specified conditions ofthe test method.The toluene and other components areseparated as they are transported through the column by aninert carrier gas.The components in the effluent are measuredby a flame ionization detector
11、(FID).The area of the impuritypeaks and toluene are electronically integrated.The peak areasare corrected with effective carbon number(ECN)4responsefactors and normalized to 100.0000%.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and
12、is the direct responsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane and TheirDerivatives.Current edition approved March 15,2012.Published March 2012.Originallyapproved in 2000.Last previous edition approved in 2010 as D6526-10.DOI:10.1520/D6526-12.2For referenced ASTM standards
13、,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,
14、Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.4Scanlon,J.T.,and Willis,D.E.,“Calculation of Flame Ionization DetectorRelative Response Factors Using the Effective Carbon Number Concept,”Journalof Chromatographic Science,Vol 23,August,1985,pp.333-339.*A Summary of Changes section appears
15、 at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This test method is suitable for determining the concen-trations of known impurities in refined toluene and for use asan integral qualit
16、y control tool where toluene is produced orused in manufacturing.5.2 Toluene purity is reported,but a chromatographic analy-sis cannot determine absolute purity if unknown or undetectedcomponents are present in the sample.6.Interferences6.1 If present,nonaromatic hydrocarbons of 13 carbons orgreater,alcohols,ethers,and other similar organic compoundscan interfere with this test method by co-eluting with thearomatic hydrocarbons.6.2 Compounds not detected by a FID are not determined bythis test m