1、Designation:D513514Standard Test Method forAnalysis of Styrene by Capillary Gas Chromatography1This standard is issued under the fixed designation D5135;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numb
2、er 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 impu-rities typically found in styrene and uses those values todetermine the purity of styren
3、e by difference by gas chroma-tography.Typical impurities in commercial styrene are foundin Table 1.1.2 This test method is applicable to impurity concentra-tions in the range of 0.001 to 1.00%and for styrene purities of99%or higher when using the internal standard procedure.1.3 In determining the c
4、onformance 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 stand
5、ard does not purport to address all the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.For a specific hazard statement,seeSect
6、ion 9.2.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 Assur
7、anceProcedures 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 Precisio
8、n of a Test MethodE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs2.2 Other DocumentOSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 See Terminology D4790 for definitions of terms used inthis test method.4.Summary of Test Method
9、4.1 In this test method,the chromatogram peak area for eachimpurity is compared to the peak area of the internal standard(n-heptane or other suitable known)added to the sample.Fromthe response factors of these impurities relative to that of theinternal standard and the amount of internal standard ad
10、ded,the concentration of the impurities are calculated.The styrenecontent is obtained by subtracting the total amount of allimpurities from 100.00.5.Significance and Use5.1 This test method is designed to obtain styrene purity onthe basis of impurities normally present in styrene and may beused for
11、final product inspections and process control.5.2 This test method will detect the impurities shown inTable 1,non-aromatic hydrocarbons containing ten carbons orless,and others where specific impurity standards are available.Absolute purity cannot be determined if unknown impuritiesare present.1This
12、 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 Feb.1,2014.Published February 2014.Originallyapproved
13、 in 1990.Last previous edition approved in 2007 as D5135 07.DOI:10.1520/D5135-14.2For 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 onth
14、e 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,We
15、st Conshohocken,PA 19428-2959.United States1 6.Interferences6.1 The internal standard chosen must be satisfactorilyresolved from any impurity as well as the product peak.Apeakwill be satisfactorily resolved from a neighboring peak if thedistance from the valley to the baseline between the two peaksi
16、s not greater than 50%of the peak height of the smaller of thetwo peaks.7.Apparatus7.1 Gas ChromatographAny instrument having a flameionization detector that can be operated at the conditions givenin Table 2.The system shall have sufficient sensitivity to obtaina minimum peak height response for 0.001 weight%impurityof twice the height of the background noise.7.2 ColumnA capillary column containing a stationaryphase of cross-linked polyethylene glycol has been found to besatisfactory.Any column
