1、Designation:D376013Standard Test Method forAnalysis of Isopropylbenzene(Cumene)by GasChromatography1This standard is issued under the fixed designation D3760;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 purityof isopropylbenzene(cumene)by gas chromatography.1.2 This test method has been fou
3、nd applicable to themeasurement of impurities such as nonaromatic hydrocarbons,benzene,ethylbenzene,t-butylbenzene,n-propylbenzene,alpha-methylstyrene,sec-butylbenzene,anddiisopropylbenzene,which are common to the manufacturingprocess of isopropylbenzene.Limit of detection for theseimpurities is 10
4、mg/kg(see 5.1).This method has been foundapplicable for concentrations of various components up to 571ppm.1.3 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 E29.1.4 The
5、 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,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate sa
6、fety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D3437 Practice for Sampling and Handling Liquid CyclicProductsD6809 Guide for Quality Control and Quality AssuranceP
7、rocedures 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 Conducting an I
8、nterlaboratory Study toDetermine the Precision of a Test MethodE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Summary of Test Method3.1 A known amount of internal standard is
9、 added to asample of isopropylbenzene.The prepared sample is mixedand analyzed by a gas chromatograph equipped with a flameionization detector(FID).The peak area of each impurity andthe internal standard is measured and the amount of eachimpurity is calculated from the ratio of the peak area of thei
10、nternal standard versus the peak area of the impurity.Purity byGC(the isopropylbenzene content)is calculated by subtractingthe sum of the impurities found from 100.00.Results arereported in weight percent.4.Significance and Use4.1 This test method is suitable for setting specifications onthe materia
11、ls referenced in 1.2 and for use as an internal qualitycontrol tool where isopropylbenzene is produced or is used ina manufacturing process.It may also be used in developmentor research work involving isopropylbenzene.4.2 This test method is useful in determining the purity ofisopropylbenzene with n
12、ormal impurities present includingdiisopropylbenzenes.If extremely high boiling or unusual1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.07 on Styrene,Ethylbenzene and C9 and C10 Arom
13、aticHydrocarbons.Current edition approved June 1,2013.Published June 2013.Originallyapproved in 1979.Last previous edition approved in 2012 as D3760 12.DOI:10.1520/D3760-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annua
14、l 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.*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 impurities are present in the isopropylbenzene,this test methodwould not necessarily detect them and the purity calculationwould be erroneous.4.3 Cumene hydroperox
16、ide,if present,will yield decompo-sition products that will elute in the chromatogram therebygiving incorrect results.4.4 The nonaromatic hydrocarbons commonly present fromthe isopropylbenzene manufacturing process will interfere withthe determination of benzene when Column A in Table 1 isused.4.5 The internal standard must be sufficiently resolved fromany impurity and the isopropylbenzene peak.5.Apparatus5.1 Gas ChromatographAny instrument having a flameionization detector that can be operated