ANSI/ASTM D3339-2007 用半微量颜色指示剂滴定法测定石油产品酸值的试验方法

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【英文标准名称】:TestMethodforAcidNumberofPetroleumProductsbySemi-microColorIndicatorTitration
【原文标准名称】:用半微量颜色指示剂滴定法测定石油产品酸值的试验方法
【标准号】:ANSI/ASTMD3339-2007
【标准状态】:作废
【国别】:美国
【发布日期】:2007
【实施或试行日期】:2007-11-27
【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】:酸值;酸;指示剂;数;石油产品;测试
【英文主题词】:Acidnumber;Acids;Colourindicator;Colourindicatortitration;Indicators;Micro;Numbers;Petroleumproducts;Testing;Tests;Titrationmethod;Total
【摘要】:Thistestmethodcoversthedeterminationofacidicconstituentsinneworusedpetroleumproductsandlubricantssolubleornearlysolubleinmixturesoftoluene,andisopropylalcohol.ThetestmethodisespeciallyintendedforcasesinwhichtheamountofsampleavailabletobeanalyzedistoosmalltoallowaccurateanalysisbyTestMethodsD974orD664.Itisapplicableforthedeterminationofacidshavingdissociationconstantsinwaterlargerthan10.Extremelyweakacidshavingdissociationconstantssmallerthan10donotinterfere.Saltstitrateiftheirhydrolysisconstantsarelargerthan10.Thistestmethodcanbeusedtoindicaterelativechangesinacidnumberthatoccurinanoilduringuseunderoxidizingconditions.Althoughthetitrationismadeunderdefiniteequilibriumconditions,themethoddoesnotmeasureanabsoluteacidicpropertythatcanbeusedtopredictperformanceofanoilunderserviceconditions.Nogeneralrelationshipbetweenbearingcorrosionandacidnumberisknown.SincethistestmethodrequiressubstantiallylesssamplethanTestMethodsD974orD664,itprovidesanadvantageousmeansofmonitoringanoxidationtestbychangesinacidnumberby(1)minimizingtestsampledepletionforacidnumberanalysesandthusminimizingthedisturbanceofthetestor(2)allowingadditionalacidnumberanalysestobemadewhilemaintainingthesametestsampledepletionandthusprovidingadditionaldata.Note1-Someoils,suchasmanycuttingoils,rust-proofingoils,andsimilarcompoundedoils,orexcessivelydark-coloredoils,maybemoredifficulttoanalyzebythistestmethodduetoobscurityofthecolor-indicatorendpoint.TheseoilscanbeanalyzedbyTestMethodD664providedsufficientsampleisavailable.However,thissituationismuchlesslikelyusingTestMethodD3339thanusingTestMethodD974duetotheuseofamorehighlydilutesampleduringthetitrationandduetothegreaterstabilityoftheendpointcolorchange.TheacidnumbersobtainedbyTestMethodD3339mayormaynotbenumericallythesameasthoseobtainedbyTestMethodD664buttheyshouldbeofthesameorderofmagnitude.Note2-TheresultsobtainedusingthismethodhavebeenfoundtobenumericallythesameasthoseobtainedusingTestMethodD974,withintheprecisionofthetwomethods,forneworoxidizedlubricantsofthetypeprimarilyintendedforhydraulicorsteamturbinetypeservice.TheoxidizedlubricantswereobtainedusingtheTestMethodD943oxidationtest.Thiscorrelationisshownbythecorrelationcoefficientr=0.989withslopes=+1.017andintercepty=+0.029,calculatedusingtheacidnumbersobtainedusingbothtitrationmethodsforthesamplesusedfortheprecisionstatement(12.2).ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,seeSections7and9,A1.1.4,A2.3.1,andA2.10.1.
【中国标准分类号】:G65
【国际标准分类号】:75_080
【页数】:
【正文语种】:英语