ASTM_D_4808_-_01_2012.pdf

Designation:D480801(Reapproved 2012)Standard Test Methods forHydrogen Content of Light Distillates,Middle Distillates,Gas Oils,and Residua by Low-Resolution Nuclear MagneticResonance Spectroscopy1This standard is issued under the fixed designation D4808;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the determination of thehydrogen content of petroleum products ranging from atmo-spheric distillates to vacuum residua using a continuous wave,low-resolution nuclear magnetic resonance spectrometer.(TestMethod D3701 is the preferred method for determining thehydrogen content of aviation turbine fuels using nuclearmagnetic resonance spectroscopy.)1.2 Three test methods are included here that account for thespecial characteristics of different petroleum products andapply to the following distillation ranges:Test MethodPetroleum ProductsBoiling Range,C(F)(approximate)ALight Distillates15260(60500)BMiddle Distillates200370(400700)Gas Oils370510(700950)CResidua510+(950+)1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.The preferred units are mass%.1.4 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.For specificwarning statements,see Sections 6.2 and 6.4.2.Referenced Documents2.1 ASTM Standards:2D3701 Test Method for Hydrogen Content of AviationTurbine Fuels by Low Resolution Nuclear MagneticResonance SpectrometryD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD5291 Test Methods for Instrumental Determination ofCarbon,Hydrogen,and Nitrogen in Petroleum Productsand Lubricants3.Summary of Test Methods3.1 A test specimen is compared in a continuous wave,low-resolution nuclear magnetic resonance(NMR)spectrom-eter with a reference standard sample.The spectrometerrecords in a nondestructive fashion the absolute concentrationof hydrogen atoms in the reference standard and test sample.The absolute hydrogen concentrations reported by the integra-tor on the NMR instrument for the standard and test specimensare used as a means of comparing the theoretical hydrogencontent of the standard with that of the sample,the result beingexpressed as the hydrogen content(on a mass%basis)of thesample.3.2 To ensure an accurate measure of the absolute hydrogencontent of the reference standard and sample,it is necessary toensure that the measured hydrogen integrator counts are alwaysdirectly proportional to the absolute hydrogen content of thestandard and sample.3.3 Undercounting of the reference standard with respect tothe sample is avoided in Test Methods B and C by dilution ofthe standard with a relaxation reagent solution.Undercountingof highly viscous or solid test samples is avoided by dissolvingthe sample in a non-hydrogen containing solvent,whichensures that all of the weighed sample is in a fluid andhomogeneous solution at the time of measurement.An elevatedsample temperature at the time of measurement also ensures ahomogeneous liquid-phase sample.4.Significance and Use4.1 The hydrogen content represents a fundamental qualityof a petroleum product that has been correlated with many ofthe performance characteristics of that product.1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and are the direct responsibilityof Subcommittee D02.03 on Elemental Analysis.Current edition approved April 15,2012.Published May 2012.Originallyapproved in 1988.Last previous edition approved in 2006 as D480801(2006).DOI:10.1520/D4808-01R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 This test method provides a simple and more precisealternative to existing test methods,specifically combustiontechniques(Test Methods D5291)for determining the hydro-gen content on a range of petroleum products.5.ApparatusNOTE1This test method has been written around the NewportAnalyzer Mark IIIF or its replacement version,the Newport 4000(OxfordAnalytical Instruments,Ltd.,Oxford,England),and the details of the testmethod are to be read in conjunction with the manufacturers handbook.These instruments have demonstrated statistically in