ASTM_D_7621_-_15a.pdf

Designation:D762115aIP 570Standard Test Method forDetermination of Hydrogen Sulfide in Fuel Oils by RapidLiquid Phase Extraction1,2This standard is issued under the fixed designation D7621;the number immediately following the designation indicates the year oforiginal adoption 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 procedures(A and B)for thedetermination of the hydrogen sulfide(H2S)content of fuel oilssuch as marine residual fuels and blend stocks,with viscosityup to 3000 mm2s-1at 50 C,and marine distillate fuels,asmeasured in the liquid phase.NOTE1Specification fuels falling within the scope of this test methodare:ASTM Specification D396,MIL-DTL-16884,and ISO 8217.1.2 Procedure A has been shown to eliminate interferencessuch as thiols(mercaptans)and alkyl sulfides.Procedure B cangive elevated results if such interferences are present(seeAnnex A2).NOTE2A procedure for measuring the amount of hydrogen sulfide incrude oil can be found in Appendix X1.Full precision for Appendix X1has not yet been determined.1.3 Valid ranges for the precision are given in Table 2 andTable 3.Measurements can be made outside these rangeshowever precision has not been determined.1.4 Samples containing FAME do not affect the measure-ment of hydrogen sulfide by this test method.1.5 The values stated in SI units are to be regarded asstandard.Non-SI units given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D396 Specification for Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD5705 Test Method for Measurement of Hydrogen Sulfidein the Vapor Phase Above Residual Fuel OilsD6021 Test Method for Measurement of Total HydrogenSulfide in Residual Fuels by Multiple Headspace Extrac-tion and Sulfur Specific DetectionD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricants2.2 ASTM Adjuncts:4ADJ6300 D2PP Determination of Precision and Bias datafor Use in Test Methods for Petroleum Products2.3 ISO Standards:5ISO 4259 Petroleum ProductsDetermination and Applica-tion of Precision Data in Relation to Methods of TestISO 8217 Fuels(Class F)Specification of Marine Fuels2.4 Energy Institute Standards:6IP 399 Test Method for Determination of Hydrogen Sulfidein Fuel OilsIP 570 Test Method for Determination of Hydrogen Sulfidein Fuel OilsRapid Liquid Phase Extraction Method2.5 U.S.Department of Defense Specifications:7MIL-DTL-16884 Fuel,Naval Distillate1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved Oct.1,2015.Published December 2015.Originallyapproved in 2010.Last previous edition approved in 2015 as D7621 15.DOI:10.1520/D7621-15A.2This test method has been developed through the cooperative effort betweenASTM and the Energy Institute,London.The IP and ASTM logos imply that theASTM and IP standards are technically equivalent,but their use does not imply thatboth standards are editorially identical.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 Summary page onthe ASTM website.4For referenced ASTM adjuncts contact ASTM Customer Service atserviceastm.org.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.6Available from Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.uk.7Available online at https:/assist.dla.mil/quicksearch/or http:/ from the Standardization Document Order Desk,700 Robbins Avenue,Building4D,Philadelphia,PA 19111-5094.*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 States1 3.Terminology3.1 Definitions:3.1.1 residual fuel oil,nfuel oil comprising a blend ofviscous long,short or cracked residue from a petroleumrefining process and lighter distillates(blend stocks)blended toa fuel oil viscosity specification,burned for the generation ofheat in a furnace or firebox or for the generation of power in anengine.3.2 Definitions of Terms Specific to This Standard:3.2.1 liquid phase extraction,ntechnique to determine theconcentration of H2S gas trapped in a liquid by continuousanalysis of gases