ASTM_D_2306_-_00.pdf

Designation:D 2306 00Standard Test Method forC8Aromatic Hydrocarbon Analysis by GasChromatography1This standard is issued under the fixed designation D 2306;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method determines the relative distribution ofthe individual C8aromatic hydrocarbon isomers in the follow-ing xylene products:1.1.1 Nitration grade xylene conforming to SpecificationD 843.1.1.2 Xylenes for p-Xylene feedstock conforming to Speci-fication D 5211.1.1.3 Ten-degree xylene conforming to Specification D 846.1.2 The absolute concentration of hydrocarbon impuritiestypically found in commercially available mixed C8aromatichydrocarbons should be determined using Test MethodD 2360.1.3 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 digitused in expressing the specification limit,in accordance withthe rounding-off method of ASTM Practice E 29.1.4 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.For specific hazardstatements,see Section 9.2.Referenced Documents2.1 ASTM Standards:D 843 Specification for Nitration Grade Xylene2D 846 Specification for Ten-Degree Xylene3D 2360 Test Method for Trace Impurities in MonocyclicAromatic Hydrocarbons by Gas Chromatography2D 3437 Practice for Sampling and Handling Liquid CyclicProducts2D 3797 Test Method for Analysis of o-Xylene by GasChromatography2D 3798 Test Method for Analysis of p-Xylene by GasChromatography2D 4626 Practice for Calculation of Gas ChromatographicResponse Factors4D 4790 Terminology of Aromatic Hydrocarbons and Re-lated Chemicals2D 5060 Test Method for Determining Impurities in High-Purity Ethylbenzene by Gas Chromatography2D 5211 Specification for Xylenes for p-Xylene Feedstock2E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications5E 260 Practice for Packed Column Gas Chromatography5E 355 Practice for Gas Chromatography Terms and Rela-tionships5E 691 Practice for Conducting an Interlaboratory Test Pro-gram to Determine the Precision of Test Methods52.2Other Document:OSHA Regulations,29 CFR,paragraphs 1910.1000 and1910.120063.Terminology3.1 Definitions:3.1.1 For definition of terms used in this test method seeTerminology D 4790.4.Summary of Test Method4.1 The specimen is introduced into a gas chromatographequipped with either a flame ionization detector(FID)orthermal conductivity detector(TCD).Either packed or capil-lary columns are permitted.The peak area of each componentis measured and the weight percent concentration is calculatedby dividing the peak area of the individual component by thesum of the total individual peak areas.The result is multipliedby 100 to get the normalized C8aromatic hydrocarbon isomerdistribution.1This 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,Cyclohexane,and TheirDerivatives.Current edition approved June 10,2000.Published August 2000.Originallypublished as D 2306 64.Last previous edition D 2306 96.2Annual Book of ASTM Standards,Vol 06.04.3Discontinued 1991.See 1990 Annual Book of ASTM Standards,Vol 06.03.4Annual Book of ASTM Standards,Vol 05.02.5Annual Book of ASTM Standards,Vol 14.02.6Available from the Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.5.Significance and Use5.1 This test method is suitable for setting specifications onthe materials referenced in 1.1.1 through 1.1.3.This testmethod may also be used as an internal quality control tool andin development or research work.5.1.1 Refer to Methods D 5060,D 3797,and D 3798 todetermine the purity of ethylbenzene,o-xylene,and p-xylenerespectively.5.2 This test method does not attempt to determine theabsolute purity of the sample,but defines the relative distribu-tion of the C8aromatic hydrocarbons.6.Interferences6.1 If present,nonaromatic hydrocarbons of twelve carbonsor greater will be interferences in this analysis.7.Apparatus7.1 Gas ChromatographAny instrument having a flameionization detector or a thermal conductivity detector may beused.A flame ionization detector is preferred.7.2 ColumnsBoth capillary and packed columns contain-ing a stationary phase of cross-linked po