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ID:20627841
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时间:2018-10-14
《ASTM D4739-17 用电位滴定法测定碱值的标准试验方法》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、ThisinternationalstandardwasdevelopedinaccordancewithinternationallyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecommendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.Desig
2、nation:D4739−11(Reapproved2017)StandardTestMethodforBaseNumberDeterminationbyPotentiometricHydrochloric1AcidTitrationThisstandardisissuedundertheÞxeddesignationD4739;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevis
3、ion.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONCurrently,therearetwoASTMtestmethodsunderthejurisdictionofCommitteeD02usedfordeterminingbasenumberbypotentiometrictitration:TestMethod
4、D2896andTestMethodD4739.Theyarebothusedthroughoutthepetroleumindustry.TestMethodD2896isfornewoilsandisusedinsettingspeciÞcationssinceitismoreaccuratethanTestMethodD4739.TestMethodD4739shallbeusedexclusivelyforthepurposeoftrackingbasenumberlossasanoilproceedsinservice.Inmanycases,thet
5、estmethodswillprovidedifferentresults.SomecomparisonsaregivenintheScopeandtheSigniÞcanceandUsesectionsofthistestmethodtodistinguishbetweenthetwostandardsandtoprovideguidancetousers.1.Scopevaluesobtainedbythistestmethodonly;basenumbersobtainedbythistestmethodarenotintendedtobeequalto1
6、.1Thistestmethodcoversaprocedureforthedetermina-valuesbyothertestmethods.AlthoughtheanalysisismadetionofbasicconstituentsinpetroleumproductsandnewandundercloselyspeciÞedconditions,thistestmethodisnotusedlubricants.Thistestmethodresolvestheseconstituentsintendedto,anddoesnot,resultinr
7、eportedbasicpropertiesintogroupshavingweak-baseandstrong-baseionizationthatcanbeusedunderallserviceconditionstopredictproperties,providedthedissociationconstantsofthemoreperformanceofanoil;forexample,nooverallrelationshipisstronglybasiccompoundsareatleast1000timesthanthatofknownbetwe
8、enbearingcor
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