ASTM D5501-2009 Standard Test Method for Determination of Ethanol Content of Denatured Fuel Ethanol by Gas Chromatography《使用气相色谱法测定改性燃料酒精中酒精含量的标准试验方法》.pdf

《ASTM D5501-2009 Standard Test Method for Determination of Ethanol Content of Denatured Fuel Ethanol by Gas Chromatography《使用气相色谱法测定改性燃料酒精中酒精含量的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM D5501-2009 Standard Test Method for Determination of Ethanol Content of Denatured Fuel Ethanol by Gas Chromatography《使用气相色谱法测定改性燃料酒精中酒精含量的标准试验方法》.pdf（5页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: D 5501 09An American National StandardStandard Test Method forDetermination of Ethanol Content of Denatured Fuel Ethanolby Gas Chromatography1This standard is issued under the fixed designation D 5501; the number immediately following the designation indicates the year oforiginal adopti

2、on 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 ethanolcontent of denatu

3、red fuel ethanol by gas chromatography.1.2 Ethanol is determined from 93 to 97 mass % andmethanol is determined from 0.01 to 0.6 mass %. Equationsused to convert these individual alcohols from mass % tovolume % are provided.1.3 This test method does identify and quantify methanolbut does not purport

4、 to identify all individual components thatmake up the denaturant.1.4 Water cannot be determined by this test method andshall be measured by a procedure such as Test Method D 1364and the result used to correct the chromatographic values.1.5 This test method is inappropriate for impurities that boila

5、t temperatures higher than 225C or for impurities that causepoor or no response in a flame ionization detector, such aswater.1.6 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.7 This standard does not purport to address all o

6、f 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.2. Referenced Documents2.1 ASTM Standards:2D 1298 Test Method for

7、Density, Relative Density (SpecificGravity), or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer MethodD 1364 Test Method for Water in Volatile Solvents (KarlFischer Reagent Titration Method)D 4052 Test Method for Density and Relative Density ofLiquids by Digital Density Met

8、erD 4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD 4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD 4626 Practice for Calculation of Gas ChromatographicResponse FactorsD 4806 Specification for Denatured Fuel Ethanol for Blend-ing with Gasolines fo

9、r Use as Automotive Spark-IgnitionEngine FuelE 355 Practice for Gas Chromatography Terms and Rela-tionshipsE 594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid ChromatographyE 1064 Test Method for Water in Organic Liquids byCoulometric Karl Fischer Titration3. Term

10、inology3.1 DefinitionsThis test method makes reference to manycommon gas chromatographic procedures, terms, and relation-ships. Detailed definitions can be found in Practices E 355 andE 594.4. Summary of Test Method4.1 A representative aliquot of the fuel ethanol sample isintroduced into a gas chrom

11、atograph equipped with a polydim-ethylsiloxane bonded phase capillary column. Helium carriergas transports the vaporized aliquot through the column wherethe components are separated by the chromatographic process.Components are sensed by a flame ionization detector as theyelute from the column. The

12、detector signal is processed by anelectronic data acquisition system. The ethanol and methanolcomponents are identified by comparing their retention times tothe ones identified by analyzing standards under identicalconditions. The concentrations of all components are deter-mined in mass percent area

13、 by normalization of the peak areas.5. Significance and Use5.1 Fuel ethanol is required to be denatured with gasoline inaccordance with Specification D 4806. State and federal lawsspecify the concentration of ethanol in gasoline blends. Thedetermination of the amount of denaturant is important to1Th

14、is test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.04.0L on Hydrocarbon Analysis.Current edition approved April 15, 2009. Published May 2009. Originallyapproved in 1994. Last previous edition approved

15、 in 2004 as D 550104.2For 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.1*A Summary of Changes section appears a

16、t the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ensure the blended fuel complies with federal and state laws.This test method provides a method of determining thepercentage of ethanol (purity) of the fuel et

17、hanol that isblended into gasoline.6. Apparatus6.1 Gas Chromatograph, capable of operating at the condi-tions listed in Table 1. A heated flash vaporizing injectordesigned to provide a linear sample split injection (for ex-ample, 200:1) is required for proper sample introduction.Carrier gas controls

18、 shall be of adequate precision to providereproducible column flows and split ratios in order to maintainanalytical integrity. Pressure control devices and gauges shallbe designed to attain the linear velocity required in the columnused. A hydrogen flame ionization detector with associated gascontro

19、ls and electronics, designed for optimum response withopen tubular columns, is required.6.2 Sample IntroductionManual or automatic liquid sy-ringe sample injection to the splitting injector is employed.Devices capable of 0.1 to 0.5 L injections are suitable. Itshould be noted that inadequate splitte

20、r design, poor injectiontechnique, and overloading the column can result in poorresolution. Avoid overloading, particularly of the ethanol peak,and eliminate this condition during analysis.6.3 ColumnThis test method utilizes a fused silica opentubular column with non-polar polydimethylsiloxane bonde

21、d(cross-linked) phase internal coating.Any column with equiva-lent or better chromatographic efficiency and selectivity tothose described in 6.3.1 can be used.6.3.1 Open tubular column with a non-polar polydimethyl-siloxane bonded (cross-linked) phase internal coating, either150 m by 0.25 mm with a

22、1.0 m film thickness, or 100 m by0.25 mm with a 0.5 film thickness is required.6.4 Electronic Data Acquisition SystemAny data acquisi-tion and integration device used for quantification of theseanalyses must meet or exceed these minimum requirements:6.4.1 Capacity for at least 80 peaks/analysis,6.4.

23、2 Normalized percent calculation based on peak areaand using response factors,6.4.3 Identification of individual components based on re-tention time,6.4.4 Noise and spike rejection capability,6.4.5 Sampling rate for narrow (96 %ethanol, 0.1 % methanol and 3.9 % n-heptane. Calculate themass relative

24、response factor according to Practice D 4626.11. Gas Chromatographic Analysis Procedure11.1 Set the instrument operating variables. See Table 1 fortypical operating conditions.11.2 Set instrumental sensitivity such that any component ofat least 0.002 mass % can be detected and integrated.11.3 Inject

25、 0.1 to 0.5 L of sample into the injection portand start the analysis. Obtain a chromatogram and peakintegration report. A sample chromatogram is shown in Fig. 1.11.4 The ethanol peak will require tangential skimming tobe correctly integrated if components of the denaturant elute onthe ethanol peaks

26、 tail.12. Calculation12.1 Multiply the area of each identified peak by theappropriate mass relative response factor. Use those factorsdetermined for individual compounds and use a factor of 1.000for unknowns.12.2 Determine the relative mass percent of the individualalcohols by using the following eq

27、uation:RMi5ARi3 100ARt(2)where:RMi= relative mass % of the individual alcohols,ARi= area of the individual alcohol peak corrected by theappropriate mass relative response factor (see 12.1),andARt= total area of all detected peaks corrected by theirappropriate mass relative response factors (12.1 ).1

28、2.3 Obtain the mass % of water in the sample. TestMethods D 1364, E 1064, or equivalent, can be used.12.4 Determine the mass % of the alcohols of interest byusing the following equation:TABLE 2 Pertinent Component DataTypical Mass RelativeResponse FactorsARelative Density at15.56CMethanol 3.20 0.796

29、Ethanol 2.06 0.794Awhere n-heptane = 1.D5501093Mi5RMi3 100 2 mass % water in sample!100(3)where:Mi= mass % of the individual alcohol being determined,andRMi= relative mass % of the individual alcohol from Eq2.12.5 For the volumetric concentration of the alcohol, calcu-late as follows:Vi5Mi3 DsDi(4)w

30、here:Vi= volume % of component i,Mi= mass % of component i from Eq 3,Di= relative density at 15.56C of component i as foundin Table 2, andDs= sample under study as determined by Test MethodD 1298 or D 4052.13. Report13.1 Report the purity of the individual alcohols to thenearest 0.01 mass % using Eq

31、 3 or nearest 0.01 volume %using Eq 4.14. Precision and Bias14.1 PrecisionThe precision of this test method as deter-mined by the statistical examination of the interlaboratory gaschromatographic test results is as follows:14.1.1 RepeatabilityThe difference between successiveresults obtained by the

32、same operator with the same apparatusunder constant operating conditions on identical test materialswould, in the long run, in the normal and correct operation ofthe test method exceed the following values only in one case intwenty.RepeatabilityAComponent Range,Mass %Repeatability,Mass %Ethanol 9397

33、 0.21Methanol 0.010.6 0.01859 =XAwhere X is the mass percent.14.1.2 ReproducibilityThe difference between two singleand independent results obtained by different laboratories onidentical test material would, in the long run, exceed thefollowing values only in one case in twenty:ReproducibilityACompo

34、nent Range,Mass %Reproducibility,Mass %Ethanol 9397 0.53Methanol 0.010.6 0.1172 =XAwhere X is the mass percent.NOTE 2The data below shows repeatabilities and reproducibilities forethanol and several methanol values obtained using the formulas given in14.1.1 and 14.1.2.Calculated Precision Values for

35、 Ethanol and MethanolRepeatability Reproducibilityamount r amount REtOH for all resultswithin scope(93to97%)0.21 EtOH for all resultswithin scope(93to97%)0.53MeOH 0.01 0.00186 MeOH 0.01 0.011720.05 0.00416 0.05 0.026210.10 0.00588 0.10 0.037060.25 0.00930 0.25 0.058600.50 0.01315 0.50 0.082870.60 0.

36、01440 0.60 0.0907814.1.3 BiasNo significant difference was found betweenthe ethanol or methanol content obtained by this test methodand the expected ethanol or methanol content (based on theconcentrations of ethanol and methanol in the preparedsamples) for the fuel ethanol samples analyzed in the ro

37、undrobin used to evaluate the precision of this test method.415. Keywords15.1 denatured; ethanol; fuel grade gas chromatography4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Reports RR: D02-1266.FIG. 1 Sample ChromatogramD5501094SUMMARY

38、OF CHANGESSubcommittee D02.04.0L has identified the location of selected changes to this standard since the last issue(D 550104) that may impact the use of this standard.(1) Changed the lower end of the applicable range for metha-nol from 0.1 to 0.01 mass % in 1.2 to align with 14.1.1 and14.1.2.(2)

39、Revised 11.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of suc

40、h rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addit

41、ional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the

42、 ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D5501095