1、Designation:D278691(Reapproved 2011)Standard Test Method forHydrocarbon Types Analysis of Gas-Oil Saturates Fractionsby High Ionizing Voltage Mass Spectrometry1This standard is issued under the fixed designation D2786;the number immediately following the designation indicates the year oforiginal ado
2、ption 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.Scope1.1 This test method2covers the determination by highionizing voltage mass spectro
3、metry of seven saturated hydro-carbon types and one aromatic type in saturate petroleumfractions having average carbon numbers 16 through 32.Thesaturate types include alkanes(0-rings),single-ring naph-thenes,and five fused naphthene types with 2,3,4,5,and 6rings.The nonsaturate type is monoaromatic.
4、Noncondensednaphthenes are analyzed as single rings.Samples must benonolefinic and must contain less than 5 volume%monoaro-matic.Composition data are in volume percent.1.2 The values stated in acceptable SI units are to beregarded as the standard.The values given in parentheses areprovided for infor
5、mation purposes only.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to u
6、se.2.Referenced Documents2.1 ASTM Standards:3D2549 Test Method for Separation of Representative Aro-matics and Nonaromatics Fractions of High-Boiling Oilsby Elution ChromatographyD3239 Test Method for Aromatic Types Analysis of Gas-OilAromatic Fractions by High Ionizing Voltage Mass Spec-trometryE13
7、7 Practice for Evaluation of Mass Spectrometers forQuantitative Analysis from a Batch Inlet(Withdrawn1992)43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1Characteristic Mass Groupings:3.1.1.1(715 711851991113alkanes!.(1)3.1.1.2(695 691831971111112511391 2 ring!.(2)3.1.1.3(1095
8、1091123113711511165117911932 2 ring!.(3)3.1.1.4(1495 14911631177119112051219123312473 2 ring!.(4)3.1.1.5(1895 189120312171231124512591273128713014 2 ring!.(5)3.1.1.6(2295 2291243125712711285129913131327134113555 2 ring!.(6)3.1.1.7(2695 26912831297131113251339135313671381139514096 2 ring!.(7)3.1.1.8(
9、915 91110511171119112911311133114311451147115711591171monoaromatic!.(8)4.Summary of Test Method4.1 The relative abundance of alkanes(0-ring),1-ring,2-ring,3-ring,4-ring,5-ring,and 6-ring naphthenes in petro-leum saturate fractions is determined by mass spectrometry1This test method is under the juri
10、sdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.04.0M on Mass Spectroscopy.Current edition approved Oct.1,2011.Published October 2011.Originallyapproved in 1969.Last previous edition approved in 2006 as D2786 91(2006).DOI:10.1520
11、/D2786-91R11.2Hood,A.,and ONeal,M.J.,Advances in Mass Spectrometry,AMSPA,Waldron,1959,p.175.3For 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 Summar
12、y page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 using a summation of mass fragment groups most characteris-tic of each molecular
13、 type.Calculations are carried out by theuse of inverted matrices(derived from ion intensity calibrationsensitivities)that are specific for any average carbon number.The saturate fraction is obtained by liquid elution chromatog-raphy,see Test Method D2549.5.Significance and Use5.1 Aknowledge of the
14、hydrocarbon composition of processstreams and petroleum products boiling within the range of 205to 540C(400 to 1000F)is useful in following the effect ofchanges in process variables,diagnosing the source of plantupsets and in evaluating the effect of changes in compositionon product performance prop
15、erties.5.2 This test method,when used together with Test MethodD3239,provides a detailed analysis of the hydrocarbon com-position of such materials.6.Apparatus6.1 Mass SpectrometerThe suitability of the mass spec-trometer to be used with this method shall be proven byperformance tests described both
16、 herein and in Practice E137.6.2 Sample Inlet SystemAny inlet system may be used thatpermits the introduction of the sample without loss,contami-nation,or change in composition.The system must function inthe range from 125 to 350C to provide an appropriatesampling device.6.3 Microburet or Constant-Volume Pipet.7.Reagents7.1 n-Hexadecane.(WarningCombustible.Vapor harm-ful.)8.Calibration8.1 Calibration matrix inverses are attached in Table 1which may be used directly provided the following procedu
