Designation:D6470−99(Reapproved2015)StandardTestMethodforSaltinCrudeOils(PotentiometricMethod)1ThisstandardisissuedunderthefixeddesignationD6470;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofsaltincrudeoils.Forthepurposeofthistestmethod,saltisexpressedas%(m/m)NaCl(sodiumchloride)andcoverstherangefrom0.0005%to0.15%(m/m).1.2Thelimitofdetectionis0.0002%(m/m)forsalt(asNaCl).1.3Thetestmethodisapplicabletonearlyalloftheheavierpetroleumproducts,suchascrudeoils,residues,andfueloils.Itmayalsobeappliedtousedturbineoilandmarinedieselfueltoestimateseawatercontamination.Waterextractablesalts,originatingfromadditivespresentinoils,arecodetermined.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D329SpecificationforAcetoneD770SpecificationforIsopropylAlcoholD843SpecificationforNitrationGradeXyleneD1193SpecificationforReagentWaterD4006TestMethodforWaterinCrudeOilbyDistillationD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProductsD4377TestMethodforWaterinCrudeOilsbyPotentiomet-ricKarlFischerTitrationD4928TestMethodforWaterinCrudeOilsbyCoulometricKarlFischerTitrationE200PracticeforPreparation,Standardization,andStorageofStandardandReagentSolutionsforChemicalAnalysis3.SummaryofTestMethod3.1Afterhomogenizingthecrudeoilwithamixer,aweighedaliquotisdissolvedinxyleneat65°Candextractedwithspecifiedvolumesofalcohol,acetone,andwaterinanelectricallyheatedextractionapparatus.Aportiono...
