1、Designation:D236011Standard Test Method forTrace Impurities in Monocyclic Aromatic Hydrocarbons byGas Chromatography1This standard is issued under the fixed designation D2360;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f 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 the totalnonaromatic hydrocarbons,and trace monocyclic aromatichydrocarbons
3、 in the purity of toluene and mixed xylenes by gaschromatography.1.2 Nonaromatic aliphatic hydrocarbons containing 1through 10 carbon atoms(methane through decanes)can bedetected by this test method at concentrations ranging from0.001%to 2.500 weight%.1.2.1 A small amount of benzene in mixed xylenes
4、 may notbe distinguished from the nonaromatics and the concentrationsare determined as a composite.1.3 Monocyclic aromatic hydrocarbon impurities containing6 through 9 carbon atoms(benzene through C9aromatics)canbe detected by this test method at individual concentrationsranging from 0.001%to 1.000
5、weight%.1.4 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 E29.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are include
6、d 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 determine the applica-bility of regulatory limitations prior to use.
7、For specific hazardstatement,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D841 Specification for Nitration Grade TolueneD3437 Practice for Sampling and Handling Liquid CyclicProductsD3797 Test Method for Analysis of o-Xylene by Gas Chro-matographyD4492 Test Method for Analysis of Benzene
8、by Gas Chro-matographyD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD5211 Specification for Xylenes for p-Xylene FeedstockD6563 Test Method for Benzene,Toluene,Xylene(BTX)Concentrates Analysis by Gas ChromatographyD6809 Guide for Quality Control and Quality AssuranceProcedures for A
9、romatic Hydrocarbons and Related Ma-terialsD7504 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography andEffective Carbon NumberE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE260 Practice for Packed Column Gas C
10、hromatographyE355 Practice for Gas Chromatography Terms and Relation-shipsE691 Practice for Conducting 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 juris
11、diction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane and TheirDerivatives.Current edition approved June 1,2011.Published August 2011.Originallyapproved in 1966.Last previous edition a
12、pproved in 2008 as D2360 08.DOI:10.1520/D2360-11.2For 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.*A Summary of Cha
13、nges section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,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 Definitions:3.1.1 For definition of terms used i
14、n this test method seeTerminology D4790.4.Summary of Test Method4.1 A known amount of an internal standard is added to thespecimen that is then introduced into a gas chromatograph(GC)equipped with a flame ionization detector(FID).Thepeak area of each impurity and the internal standard ismeasured and
15、 the amount of each impurity is calculated fromthe ratio of the peak area of the internal standard versus thepeak area of the impurity.Purity by GC is calculated bysubtracting the sum of the impurities found from 100.00.Results are reported either in weight percent or volumepercent.5.Significance an
16、d Use5.1 The determination of hydrocarbon impurities containedin toluene and mixed xylenes used as chemical intermediatesand solvents is typically required.This test is suitable forsetting specifications and for use as an internal quality controltool where aromatic monocyclic hydrocarbons are produced orare used.This test method is applicable for determining theimpurities from the aromatic hydrocarbon production process.Typical impurities are alkanes containing 1 to 10 carbon atoms,benzene,tolue
