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【英文标准名称】:StandardTestMethodforColorofClearLiquids(Platinum-CobaltScale)
【原文标准名称】:透明液体色度的标准试验方法(铂钴标度)
【标准号】:ASTMD1209-2005e1
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.35
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:clearliquids;color;platinum-cobaltcolorscale;Color--organic/inorganicchemicals;Color--paints/relatedcoatings/materials;Clearliquids;Platinum-cobaltscale
【摘要】:Thepropertyofcolorofasolventvariesinimportancewiththeapplicationforwhichitisintended,theamountofcolorthatcanbetoleratedbeingdependentonthecolorcharacteristicsofthematerialinwhichitisused.Thepaint,varnish,andlacquersolvents,ordiluentscommerciallyavailableontoday''smarketnormallyhavelittleornocolor.Thepresenceorabsenceofcolorinsuchmaterialisanindicationofthedegreeofrefinementtowhichthesolventhasbeensubjectedorofthecleanlinessoftheshippingorstoragecontainerinwhichitishandled,orboth.Foranumberofyearsthetermx201C;water-whitex201D;wasconsideredsufficientasameasurementofsolventcolor.Severalexpressionsfordefiningx201C;water-whitex201D;graduallyappearedanditbecameevidentthatamoreprecisecolorstandardwasneeded.Thiswasaccomplishedin1952withtheadoptionofTestMethodD1209usingtheplatinum-cobaltscale.ThistestmethodissimilartothedescriptiongiveninStandardMethodsfortheExaminationofWaterandWasteWaterandisreferredtobymanyasx201C;APHAColor.x201D;Thepreparationoftheseplatinum-cobaltcolorstandardswasoriginallydescribedbyA.HazenintheAmericanChemicalJournalinwhichheassignedthenumber5(partspertenthousand)tohisplatinum-cobaltstocksolution.Subsequently,intheirfirstedition(1905)ofStandardMethodsfortheExaminationofWater,theAmericanPublicHealthAssociation,usingexactlythesameconcentrationofreagents,assignedthecolordesignation500(partspermillion)whichisthesameratio.Thepartspermillionnomenclatureisnotusedsincecolorisnotreferreddirectlytoaweightrelationship.Itisthereforerecommendedthattheincorrecttermx201C;HazenColorx201D;shouldnotbeused.Also,becauseitrefersprimarilytowater,thetermx201C;APHAColorx201D;isundesirable.Therecommendednomenclatureforreferringtothecoloroforganicliquidsisx201C;Platinum-CobaltColor,TestMethodD1209.x201D;ThepetroleumindustryusestheSayboltcolorimeterTestMethodD156formeasuringanddefiningthecolorofhydrocarbonsolvents;however,thissystemofcolormeasurementisnotcommonlyemployedoutsideofthepetroleumindustry.IthasbeenreportedbyvarioussourcesthataSayboltcolorof+25isequivalentto25intheplatinum-cobaltsystemortocolorsproducedbymassesofpotassiumdichromaterangingbetween4.8and5.6mgdissolvedin1Lofdistilledwater.Becauseofthedifferencesinthespectralcharacteristicsoftheseveralcolorsystemsbeingcomparedandthesubjectivemannerinwhichthemeasurementsaremade,exactequivalenciesaredifficulttoobtain.1.1Thistestmethoddescribesaprocedureforthevisualmeasurementofthecolorofessentiallylightcoloredliquids(Note1).Itisapplicableonlytomaterialsinwhichthecolor-producingbodiespresenthavelightabsorptioncharacteristicsnearlyidenticalwiththoseoftheplatinum-cobaltcolorstandardsused.Note18212;Aprocedureforestimatingcolorofdarkerliquids,describedforsolublenitrocellulosebasesolutions,isgiveninGuideD365.