1、Designation:D506012(Reapproved 2021)1Standard Test Method forDetermining Impurities in High-Purity Ethylbenzene by GasChromatography1This standard is issued under the fixed designation D5060;the number immediately following the designation indicates the year oforiginal adoption or,in the case of rev
2、ision,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.1NOTEEditorial changes were made throughout in January 2021.1.Scope1.1 This test method describes the analysis of no
3、rmallyoccurring impurities in,and the purity of,ethylbenzene by gaschromatography.Impurities determined include nonaromatichydrocarbons,benzene,toluene,xylenes,cumene,and dieth-ylbenzene isomers.1.2 This test method is applicable for impurities at concen-trations from 0.001 to 1.000%and for ethylben
4、zene purities of99%or higher.At this level,p-xylene may not be detected.1.3 In determining the performance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.4 The values stated in SI units are to
5、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,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental prac
6、tices and deter-mine the applicability of regulatory limitations prior to use.For a specific hazard statement,see Section 8.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDev
7、elopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3437 Practice for Sampling and Handling Liquid CyclicProductsD4307 Practice for Preparation of Liquid Blends for
8、Use asAnalytical StandardsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE355 Practice for Gas Chromatography Terms and Relation-shipsE15
9、10 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other Documents:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Summary of Test Method3.1 A known amount of internal standard is added to thesample.Agas chromatograph equipped with a flame ioni
10、zationdetector and a polar fused silica capillary column is used forthe analysis.The impurities are measured relative to theinternal standard.Ethylbenzene purity is calculated by sub-tracting the impurities found from 100.00%.4.Significance and Use4.1 The test is suitable for setting specifications
11、on ethyl-benzene and for use as an internal quality control tool where1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.07 on Styrene,Ethylbenzene and C9 and C10AromaticHydroca
12、rbons.Current edition approved Jan.1,2021.Published February 2021.Originallyapproved in 1990.Last previous edition approved in 2012 as D5060 12.DOI:10.1520/D5060-12R21E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual
13、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,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Ha
14、rbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations
15、 issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1ethylbenzene is used in manufacturing processes.It may beused in development or research work involving ethylbenzene.4.2 Purity is commonly reported by subtracting the deter-mined expected impurities from 100%.Absolut
16、e purity cannotbe determined if unknown impurities are present.5.Interferences5.1 A key operational parameter for this method is theseparation of p-xylene from ethylbenzene.Care should betaken during calibration to ensure the separation of these twocomponents.If p-xylene is not separated from ethylbenzeneduring the calibration of the instrument,modify the columnflow rate slightly until separation is achieved.6.Apparatus6.1 Gas Chromatograph(GC),any GC built for capillarycolumn chromatography and
