ANSI/ASTM D4739-2007 用电势滴定法测定碱值的试验方法

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【英文标准名称】:TestMethodforBaseNumberDeterminationbyPotentiometricTitration
【原文标准名称】:用电势滴定法测定碱值的试验方法
【标准号】:ANSI/ASTMD4739-2007
【标准状态】:作废
【国别】:美国
【发布日期】:2007
【实施或试行日期】:2007-12-25
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:碱值;测定;润滑剂;石油产品;电势分析法;测试;滴定法
【英文主题词】:Basenumber;Determination;Lubricants;Petroleumproducts;Potentiometricanalysis;Testing;Titration
【摘要】:Thistestmethodcoversaprocedureforthedeterminationofbasicconstituentsinpetroleumproductsandnewandusedlubricants.Thistestmethodresolvestheseconstituentsintogroupshavingweak-baseandstrong-baseionizationproperties,providedthedissociationconstantsofthemorestronglybasiccompoundsareatleast1000timesthanthatofthenextweakergroups.Thistestmethodcoversbasenumbersupto250.Innewandusedlubricants,theconstituentsthatcanbeconsideredtohavebasicpropertiesareprimarilyorganicandinorganicbases,includingaminocompounds.Thistestmethoduseshydrochloricacidasthetitrant,whereasTestMethodD2896usesperchloricacidasthetitrant.Thistestmethodmayormaynottitratetheseweakbasesand,ifso,itwilltitratethemtoalesserdegreeofcompletion;someadditivessuchasinhibitorsordetergentsmayshowbasiccharacteristics.Whentestingusedenginelubricants,itshouldberecognizedthatcertainweakbasesaretheresultoftheserviceratherthanhavingbeenbuiltintotheoil.Thistestmethodcanbeusedtoindicaterelativechangesthatoccurinoilduringuseunderoxidizingorotherserviceconditionsregardlessofthecolororotherpropertiesoftheresultingoil.Thevaluesobtained,however,areintendedtobecomparedwiththeothervaluesobtainedbythistestmethodonly;basenumbersobtainedbythistestmethodarenotintendedtobeequaltovaluesbyothertestmethods.Althoughtheanalysisismadeundercloselyspecifiedconditions,thistestmethodisnotintendedto,anddoesnot,resultinreportedbasicpropertiesthatcanbeusedunderallserviceconditionstopredictperformanceofanoil;forexample,nooverallrelationshipisknownbetweenbearingcorrosionorthecontrolofcorrosivewearintheengineandbasenumber.ThistestmethodwasdevelopedasanalternativefortheformerbasenumberportionofTestMethodD664(lastpublishedinTestMethodD664-81).1.4.1ColorimetrictestmethodsforbasenumberareTestMethodD974,IP139,and5102.1onacidandbasenumberbyextraction(color-indicatortitration)ofFederalTestMethodStandardNo.791b.Testresultsbythesemethodsmayormaynotbenumericallyequivalenttothistestmethod.ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G04
【国际标准分类号】:71_040_40
【页数】:
【正文语种】:英语