1、Designation:D726613(Reapproved 2018)1Standard Test Method forAnalysis of Cyclohexane by Gas Chromatography(ExternalStandard)1This standard is issued under the fixed designation D7266;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,th
2、e 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.1NOTESection 8 was editorially corrected in January 2018.1.Scope1.1 This test method covers the determination of the purityo
3、f cyclohexane by gas chromatography.Calibration of the gaschromatography system is done by the external standardcalibration technique.1.2 This test method has been found applicable to themeasurement of impurities such as those found in Table 1,which are impurities that may be found in cyclohexane.Th
4、eimpurities can be analyzed over a range of 3 to 200 mg/kg bythis method,but may be applicable to a wider range.1.3 The limit of detection is 1 mg/kg.1.4 In determining the conformance of the test results usingthis test method to applicable specifications,results shall berounded off in accordance wi
5、th the rounding-off method ofPractice E29.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the u
6、ser of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Section 8.1.7 This international standard was developed in accor-dance with internationally recognized p
7、rinciples on standard-ization established in the Decision on Principles for theDevelopment 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
8、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
9、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 TubularCapilla
10、ry Columns in Gas Chromatographs2.2 Other Document:OSHA 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 Method4.1 Cyclohexane is analyzed using a gas chromatograph(GC)equipped with a flame
11、ionization detector(FID).Aprecisely repeatable volume of the sample to be analyzed isinjected onto the gas chromatograph.The peak areas of theimpurities are measured and converted to concentrations via an1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialt
12、y and Related Chemicals and is the direct responsi-bility of Subcommittee D16.01 on Benzene,Toluene,Xylenes,Cyclohexane andTheir Derivatives.Current edition approved Jan.1,2018.Published January 2018.Originallyapproved in 2007.Last previous edition approved in 2013 as D7266 131.DOI:10.1520/D7266-13R
13、18E01.2For 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 Superintenden
14、t of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principle
15、s on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1external standard methodology.Purity by GC(the cyclohexanecontent)is calculated by
16、 subtracting the sum of the impuritiesfrom 100.00.Individual impurities are reported in mg/kg.Thecyclohexane purity is reported in weight percent.5.Significance and Use5.1 This test method is suitable for setting specifications onthe materials referenced in Table 1 and for use as an internalquality control tool where cyclohexane is produced or is usedin a manufacturing process.It may also be used in developmentor research work involving cyclohexane.5.2 This test method is useful in determining t