Designation:D7171−05(Reapproved2011)StandardTestMethodforHydrogenContentofMiddleDistillatePetroleumProductsbyLow-ResolutionPulsedNuclearMagneticResonanceSpectroscopy1ThisstandardisissuedunderthefixeddesignationD7171;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthehydro-gencontentofmiddledistillatepetroleumproductsusingalow-resolutionpulsednuclearmagneticresonance(NMR)spectrometer.Theboilingrangeofdistillatescoveredbythetestmethodis150to390°C.Whilethistestmethodmaybeapplicabletomiddledistillatesoutsidethisboilingrange,insuchcasestheprecisionstatementsmaynotapply.ThetestmethodisgenerallybasedonTestMethodsD3701andD4808,withamajordifferencebeingtheuseofapulsedNMRspectrometerinsteadofacontinuouswaveNMRspectrometer.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.2.1Thepreferredunitsaremass%.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3701TestMethodforHydrogenContentofAviationTurbineFuelsbyLowResolutionNuclearMagneticResonanceSpectrometryD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4808TestMethodsforHydrogenContentofLightDistillates,MiddleDistillates,GasOils,andResiduabyLow-ResolutionNuclearMagneticResonanceSpectros-copyD5291TestMethodsforInstrumentalDeterminationofCarbon,Hydrogen,andNitrogeninPetroleumProductsandLubricantsD6299PracticeforApplyingStatisticalQualityAssuranceandControlChartingTechniquestoEvaluateAnalyticalMeasurementSystemPerformanceD6708PracticeforStatisticalAssessmentandImprovementofExpect...
