ASTM D7266-13(2018)e1 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard).pdf
《ASTM D7266-13(2018)e1 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard).pdf》由会员分享,可在线阅读,更多相关《ASTM D7266-13(2018)e1 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard).pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7266 13 (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 revis
2、ion, 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.1NOTESection 8 was editorially corrected in January 2018.1. Scope1.1 This test method covers the determination of
3、 the purityof 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 c
4、yclohexane. Theimpurities 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
5、in accordance with 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 theres
6、ponsibility of the user 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 inter
7、nationally recognized principles 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
8、 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
9、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
10、 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 definitions of terms used inthis test method.4. Summary of Test Method4.1 Cyclohexane is analyzed using a gas chromatog
11、raph(GC) equipped with a flame 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
12、D16 onAromatic, Industrial, Specialty 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 approve
13、d in 2013 as D7266 131. DOI:10.1520/D7266-13R18E01.2For 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
14、 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 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was de
15、veloped in accordance with internationally recognized principles 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 standar
16、d methodology. Purity by GC (the cyclohexanecontent) is calculated by 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
17、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 the purity ofcyclohexane wit
18、h normal impurities present. If extremely highboiling or unusual impurities are present in the cyclohexane,this test method would not necessarily detect them and thepurity calculation would be erroneous.6. Apparatus6.1 Gas ChromatographAny instrument having a flameionization detector that can be ope
19、rated at the conditions givenin Table 2. The system should have sufficient sensitivity toobtain a minimum peak height response for 1 mg/kg benzeneof twice the height of the signal background noise.6.2 ColumnsThe choice of column is based on resolutionrequirements. Any column may be used that is capa
20、ble ofresolving all significant impurities from cyclohexane. Thecolumn described in Table 2 has been used successfully.6.3 RecorderElectronic integration is required.6.4 InjectorThe specimen must be precisely and repeat-ably injected into the gas chromatograph.An automatic sampleinjection device is
21、highly recommended. Manual injection canbe employed if the precision stated in Tables 37 can bereliably and consistently satisfied.7. Reagents and Materials7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall confo
22、rm to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the
23、determination.7.2 GasesHelium, hydrogen, nitrogen, or other as carrier.Carrier, makeup, and detector gases (except air) 99.999 %minimum purity. Oxygen in carrier gas less than 1 ppm, lessthan 0.5 ppm is preferred. Purify carrier, makeup, and detectorgases to remove oxygen, water, and hydrocarbons. P
24、urify air toremove hydrocarbons and water, and the air used for an FIDshould contain less than 0.1 ppm total hydrocarbons.8. Hazards8.1 Consult current OSHA regulations, suppliers SafetyData Sheets, and local regulations for all materials listed in thistest method.4Reagent Chemicals, American Chemic
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTM D7266 13 2018 e1 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography External

链接地址:http://www.mydoc123.com/p-286984.html