ASTM E70-2007 带玻璃电极水溶液的pH值测量用标准试验方法

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【英文标准名称】:StandardTestMethodforpHofAqueousSolutionsWiththeGlassElectrode
【原文标准名称】:带玻璃电极水溶液的pH值测量用标准试验方法
【标准号】:ASTME70-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E15.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:电极;玻璃;玻璃电极;pH值电极;pH值测量;溶剂;测试
【英文主题词】:aqueoussolution;buffer;combinationelectrode;glasselectrode;pH;pHmeter;referenceelectrode
【摘要】:pHis,withinthelimitsdescribedin1.1,anaccuratemeasurementofthehydrogenionconcentrationandthusiswidelyusedforthecharacterizationofaqueoussolutions.pHmeasurementisoneofthemainprocesscontrolvariablesinthechemicalindustryandhasaprominentplaceinpollutioncontrol.1.1ThistestmethodspecifiestheapparatusandproceduresfortheelectrometricmeasurementofpHvaluesofaqueoussolutionswiththeglasselectrode.Itdoesnotdealwiththemannerinwhichthesolutionsareprepared.pHmeasurementsofgoodprecisioncanbemadeinaqueoussolutionscontaininghighconcentrationsofelectrolytesorwater-solubleorganiccompounds,orboth.Itshouldbeunderstood,however,thatpHmeasurementsinsuchsolutionsareonlyasemiquantitativeindicationofhydrogenionconcentrationoractivity.ThemeasuredpHwillyieldanaccurateresultforthesequantitiesonlywhenthecompositionofthemediummatchesapproximatelythatofthestandardreferencesolutions.Ingeneral,thistestmethodwillnotgiveanaccuratemeasureofhydrogenionactivityunlessthepHliesbetween2and12andtheconcentrationofneitherelectrolytesnornonelectrolytesexceeds0.1mol/L(M).1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G60
【国际标准分类号】:71_040_50
【页数】:6P.;A4
【正文语种】: