Designation:D5462−13StandardTestMethodforOn-LineMeasurementofLow-LevelDissolvedOxygeninWater1ThisstandardisissuedunderthefixeddesignationD5462;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheon-linedeterminationofdissolvedoxygen(DO)inwatersamplesprimarilyinrangesfrom0to500µg/L(ppb),althoughhigherrangesmaybeusedforcalibration.On-lineinstrumentationisusedforcontinuousmeasurementsofDOinsamplesthatarebroughtthroughsamplelinesandconditionedfromhigh-temperatureandhigh-pressuresourceswhennecessary.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardsstatements,see6.5.2.ReferencedDocuments2.1ASTMStandards:2D1066PracticeforSamplingSteamD1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterD3370PracticesforSamplingWaterfromClosedConduitsD3864GuideforOn-LineMonitoringSystemsforWaterAnalysis3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1diffusion-typeprobes,n—galvanicorpolarographicsensorsthatdependonthecontinuousinfluxofoxygenthroughthemembranetodeveloptheelectricalsignal.3.2.2equilibrium-typeprobes,n—modifiedpolarographicsensingprobesthathaveanegligibleinfluxofoxygenthroughthemembraneexceptduringchangesofsampleDOconcen-tration.3.2.2.1Discussion—Oxygenconsumptionandregenerationbalanceeachotherwithintheprobesunderstableconditions,and...
