1、Designation:D784520Standard Test Method forDetermination of Chemical Species in Marine Fuel Oil byMultidimensional Gas Chromatography/Mass Spectrometry1This standard is issued under the fixed designation D7845;the number immediately following the designation indicates the year oforiginal adoption or
2、,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 quantitative determinationof a variety of chemical specie
3、s in marine fuel oil(bunker fueloil)by gas chromatography/mass spectrometry.By using thesame conditions and by selecting required mass spectralselected ions,the test method may be used for the determina-tion of other species than those for which precision statementsand limits of detection have been
4、established.1.2 An example list of chemical species for which a limit ofquantification has been determined by means of this testmethod is given in Table 1.1.3 Other refinery hydrocarbon fractions and their mixturesmay be tested using the same test method conditions.However,the precision of this test
5、 method reflects the compounds inTable 1.1.4 Results are reported to the nearest 1.0 mg kg.1.5 The values stated in SI units are to be regarded asstandard.1.5.1 ExceptionNon-SI values are given for psig.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with it
6、s use.It is theresponsibility 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.1.7 This international standard was developed in accor-dance with internationally recognized principl
7、es 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:2D4307 Practice for Preparation of Liqui
8、d Blends for Use asAnalytical StandardsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System Performance2.2 Other Standards:ISO 8217:2010 Petroleum ProductsFuels(Class F)Specifications of Marine Fuels33.Terminology3.1 Defini
9、tions:3.1.1 direct or open split interface,nany GC/MS interfaceused to maintain atmospheric pressure at capillary columnoutlet.3.1.2 reconstructed ion chromatogram(RIC),na limitedmass chromatogram representing the intensities of ion massspectrometric currents for only those ions having particularmas
10、s to charge ratios used in this test method to selectivelyextract and identify components in the presence of a complexhydrocarbon matrix.3.1.3 total ion chromatogram(TIC),nmass spectrometercomputer output representing either the summed intensities ofall scanned ion currents or a sample of the curren
11、t in the ionbeam for each spectrum scan plotted against the correspondingspectrum number.3.1.4 wall coated open tubular(WCOT),na type ofcapillary column prepared by coating or bonding the insidewall of the capillary with a thin film of stationary phase.1This test method is under the jurisdiction of
12、ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0M on Mass Spectrometry.Current edition approved June 15,2020.Published July 2020.Originallyapproved in 2013.Last previous edition approved in 2017 as D7845 17.DOI:10.1520/D7845
13、-20.2For 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 American National Standards Institute(ANSI),25
14、 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with interna
15、tionally 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.4.Summary of Test Method4.1 A suitable internal standa
16、rd,ethylbenzene d-10 is addedto the sample,which is then introduced into a gas chromato-graph equipped with two columns configured with a Deansswitching system between the two columns.The sample firstpasses through the polydimethylsiloxane(WCOT)pre-columnwhich then performs a separation of the light hydrocarbonfraction and eliminates the high boiling hydrocarbon fraction tovent.The compounds of interest and internal standard aretransferred to the high resolution polydimethylsiloxane(WCOT)analyti
