ASTM-D1125-95(R2005)-水的电导率及电阻率的测试方法

Designation:D1125–95(Reapproved2005)AnAmericanNationalStandardStandardTestMethodsforElectricalConductivityandResistivityofWater1ThisstandardisissuedunderthefixeddesignationD1125;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationoftheelectricalconductivityandresistivityofwater.Thefollowingtestmethodsareincluded:RangeSectionsTestMethodA—FieldandRoutineLaboratory10to20000012to18MeasurementofStatic(Non-Flowing)SamplesµS/cmTestMethodB—ContinuousIn-LineMeasure5to20000019to23mentµS/cm1.2Thesetestmethodshavebeentestedinreagentwater.Itistheuser’sresponsibilitytoensurethevalidityofthesetestmethodsforwatersofuntestedmatrices.1.3Formeasurementsbelowtherangeofthesetestmeth-ods,refertoTestMethodD5391.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1066PracticeforSamplingSteamD1129TerminologyRelatingtoWaterD1192SpecificationforEquipmentforSamplingWaterandSteaminClosedConduits3D1193SpecificationforReagentWaterD2186TestMethodforDeposit-FormingImpuritiesinSteamD2777PracticeforDeterminationofPrecisionandBiasofApplicableMethodsofCommitteeD19onWaterD3370PracticesforSamplingWaterfromClosedConduitsD4519TestMethodforOn-LineDeterminationofAnionsandCarbonDioxideinHighPurityWaterbyCationExchangeandDegassedCationConductivityD5391TestMethodforElectricalConductivityandResis-tivityofaFlowingHighPurityWaterSampleE1SpecificationforASTMLiquid-in-GlassThermometers3.Terminology3.1Definitions:3.1.1electricalconductivity—thereciprocalofthea-cre-sistanceinohmsmeasuredbetweenoppositefacesofacentimetrecubeofanaqueoussolutionataspecifiedtempera-ture.NOTE1—Theunitofelectricalconductivityissiemenspercentimetre.(Thepreviouslyusedunitsofmhos/cmarenumericallyequivalenttoS/cm.)Theactualresistanceofthecell,Rx,ismeasuredinohms.Theconductance,1/Rx,isdirectlyproportionaltothecross-sectionalarea,A(incm2),andinverselyproportionaltothelengthofthepath,L(incm):1/Rx5K·A/LTheconductancemeasuredbetweenoppositefacesofacentimetrecube,K,iscalledconductivity.Conductivityvaluesareusuallyexpressedinmicrosiemens/centimetreorinsiemens/centimetreataspecifiedtemperature,normally25°C.3.1.2electricalresistivity—thea-cresistanceinohmsmea-suredbetweenoppositefacesofacentimetrecubeofanaqueoussolutionataspecifiedtemperature.NOTE2—Theunitofelectricalresistivityisohm-centimetre.Theactualresistanceofthecell,Rx,ismeasuredinohms,andisdirectlyproportionaltothelengthofthepath,L(incm),andinverselyproportionaltothecross-sectionalarea,A(incm2):Rx5R·L/ATheresistancemeasuredbetweenoppositefacesofacenti-metrecube,R,iscalledresistivity.Resistivityvaluesareusuallyexpressedinohm·centimetre,orinmegohm·centime-tre,ataspecifiedtemperature,normally25°C.3.1.3Fordefinitionsofothertermsusedinthesemethods,refertoTerminologyD1129.3.2Symbols:Symbols:3.2.1SymbolsusedintheequationsinSections14and16aredefinedasfollows:J=cellconstant,cm−1,K=conductivityat25°C,µS/cm,1ThesetestmethodsareunderthejurisdictionofCommitteeD19onWaterandarethedirectresponsibilityofSubcommitteeD19.03onSamplingofWaterandWater-FormedDeposits,SurveillanceofWater,andFlowMeasurementofWater.CurrenteditionapprovedApril1,2005.PublishedApril2005.Originallyapprovedin1950.Lastpreviouseditionapprovedin1999asD1125–95(1999).2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.3Withdrawn.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.CopyrightbyASTMInt'l(allrightsreserved);ReproductionauthorizedperLicenseAgreementwithKatheHooper(ASTMIHSAccount);TueApr2611:27:24EDT2005CopyrightASTMInternationalProvidedbyIHSunderlicensewithASTMLicensee=DefenseContractMgmtCommand/5935922100NotforResale,04/14/200700:37:42MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,`,,``,`,,,,`,,,`,,`,```,``-`-`,,`,,`,`,,`---Kx=measuredconductance,S,K1=conductivityoftheKClinthereferencesolutionatthetemperatureofmeasurement(Table1),µS/cm,K2=conductivityofthewaterusedtopreparethereferencesolution,atthesametemperatureofmeasurement,µS/cm,Q=temperaturecorrectionfactor(seeSection11),R=resistivityat25°C,ohm·cm,Rx=measuredresistance,ohm.4.SignificanceandUse4.1Thesetestmethodsareapplicableforsuchpurposesasimpuritydetectionand,insomecases,thequantitativemea-surementofionicconstituentsdissolvedinwaters.Theseincludedissolvedelectrolytesinnaturalandtreatedwaters,suchasboilerwater,boilerfeedwater,coolingwater,andsalineandbrackishwater.4.1.1Their