ASTM D7266-2007 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)《用气相色谱法分析环己胺的标准试验方法(外标准)》.pdf
《ASTM D7266-2007 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)《用气相色谱法分析环己胺的标准试验方法(外标准)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7266-2007 Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)《用气相色谱法分析环己胺的标准试验方法(外标准)》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7266 07Standard Test Method forAnalysis of Cyclohexane by Gas Chromatography (ExternalStandard)1This standard is issued under the fixed designation D 7266; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the purityof cyclohexane by gas chromatography. Calibration of the gasch
3、romatography 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. Theimpurities can be analyzed over a range of 5 to 180 mg/kg
4、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 with the rounding-off method ofPractice E29.1.5 The values
5、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 user of this standard to establish appro-priate safety
6、 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:2D 3437 Practice for Sampling and Handling Liquid CyclicProductsD 4307 Practice for Preparation of Liquid Blends for U
7、se asAnalytical StandardsD 4790 Terminology of Aromatic Hydrocarbons and Re-lated ChemicalsD 6809 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 Specificatio
8、nsE 355 Practice for Gas Chromatography Terms and Rela-tionshipsE 1510 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 D 4790 for definitions of te
9、rms used inthis test method.4. Summary of Test Method4.1 Cyclohexane is analyzed using a gas chromatograph(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 measure
10、d and converted to concentrations via anexternal standard 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
11、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 meth
12、od is useful in determining the purity ofcyclohexane with 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.1This test method is under the jurisdicti
13、on of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and TheirDerivatives.Current edition approved Jan. 1, 2007. Published January 2007.2For referenced ASTM standards, visit the ASTM we
14、bsite, 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:
15、 SDE, Washington, DC 20401, http:/www.access.gpo.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 Gas ChromatographAny instrument having a flameionization detector that can be operated at the conditions givenin Tab
16、le 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 capable ofresolving all significant imp
17、urities 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 highly recommended. Manual injectio
18、n canbe employed if the precision stated in Table 3 can be reliablyand 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 conform to the specifications of the Commi
19、t-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 determination.7.2 GasesHelium, hydrog
20、en, 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. Purify air to4Reagent Chemicals, Ameri
21、can Chemical Society Specifications , AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary
22、, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.TABLE 1 Impurities Known or Suggested to be Present inCommercial CyclohexaneC4(1) n-butane(2) isobuteneC5(3) n-pentaneA(4) isopentaneA(5) cyclopentaneAC6(6) n-hexane(7) 2-methylpentaneA(8) 3-methylpentaneA(9) methylcyclopentaneA(10) benzeneA
23、(11) cyclohexeneA(12) 2,2-dimethylbutaneA(13) 2,3-dimethylbutaneAC7(14) 3,3-dimethylpentane(15) 2,2-dimethylpentaneA(16) 2,3-dimethylpentaneA(17) 2,4-dimethylpentaneA(18) 1,1-dimethylcyclopentaneA(19) trans-1,3-dimethylcyclopentaneA(20) trans-1,2-dimethylcyclopentaneA(21) cis-1,2-dimethylcyclopentan
- 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。
下载文档到电脑,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:
- ASTMD72662007STANDARDTESTMETHODFORANALYSISOFCYCLOHEXANEBYGASCHROMATOGRAPHYEXTERNALSTANDARD 用气相 色谱 分析

链接地址:http://www.mydoc123.com/p-524990.html