ASTM_D_7057_-_13.pdf

Designation:D705713Standard Test Method forAnalysis of Isopropylbenzene(Cumene)by GasChromatography(External Standard)1This standard is issued under the fixed designation D7057;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()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.Cali-bration of the gas chromatography system is done by theexternal standard calibration technique.1.2 This test method has been found applicable to themeasurement of impurities such as nonaromatic hydrocarbons,benzene,toluene,ethylbenzene,phenol,cymenes,t-butylbenzene,n-butylbenzene,n-propylbenzene,alpha-methylstyrene,sec-butylbenzene,and diisopropylbenzenes,which are impurities that can be found in isopropylbenzene.The latter impurities can be analyzed over a range of 1 mg/kgto 500 mg/kg by this method(see Table 1).The limit ofdetection for these impurities is summarized in Table 1 as well.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 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 safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 8.2.Referenced Documents2.1 ASTM Standards:2D3437 Practice for Sampling and Handling Liquid CyclicProductsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 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-shipsE691 Practice for Conducting an Interlaboratory 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.Terminology3.1 See Terminology D4790 for definition of terms used inthis test method.4.Summary of Test Method4.1 Cumene(isopropylbenzene)is analyzed by a gas chro-matograph(GC)equipped with a flame ionization detector(FID).A precisely repeatable volume of the sample to beanalyzed is injected onto the gas chromatograph.The peakareas of the impurities are measured and converted to concen-trations via an external standard methodology.Purity by GC(the Cumene content)is calculated by subtracting the sum ofthe impurities from 100.00,excluding Acetophenone(AP)and2-phenyl-2-propanol(DMPC or DMBA)which are artifacts ofcumene hydroperoxide(CHP)thermal decomposition in theinlet of the GC.Results are reported in weight percent.1This 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 AromaticHydrocarbons.Current edition approved June 1,2013.Published June 2013.Originallyapproved in 2004.Last previous edition approved in 2009 as D7057 09.DOI:10.1520/D7057-13.2For 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.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 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 setting specifications onthe materials 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.5.2 This test method is useful in determining the purity ofisopropylbenzene with normal impurities present.If extremelyhigh boiling or unusual impurities are present in theisopropylbenzene,this test method would not necessarilydetect them and the purity calculation would be erroneous.5.3 Cumene hydroperoxide,if present,will yield thermaldecomposition products,primarily AP and DMPC as stated in4.1,that wil