Designation:D4658−09StandardTestMethodforSulfideIoninWater1ThisstandardisissuedunderthefixeddesignationD4658;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodusesanion-selectiveelectrodetodeterminesulfideioninwater.Thetestmethodisapplicableintherangefrom0.04to4000mg/Lofsulfide.1.2Precisiondatapresentedinthistestmethodwereob-tainedusingreagentwateronly.Itistheuser’sresponsibilitytoensurethevalidityofthistestmethodforuntestedtypesofwater.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Sulfidesamples,whenacidified,canreleasehighlytoxichydrogensulfidegas.Foraspecificprecautionarystatement,seeNote2.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterD3370PracticesforSamplingWaterfromClosedConduitsD4127TerminologyUsedwithIon-SelectiveElectrodesD5810GuideforSpikingintoAqueousSamplesD5847PracticeforWritingQualityControlSpecificationsforStandardTestMethodsforWaterAnalysis3.Terminology3.1Definitions:Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1Fordefinitionsoftermsspecifictothistestmethod,refertoTerminologyD4127.4.SummaryofTestMethod4.1Sulfideionismeasuredpotentiometricallyusingasulfideion-selectiveelectrodeinconjunctionwithadouble-junctionsleevetypereferenceelectrode.PotentialsarereadusingapHmeterhavinganexpandedmillivoltscalecapableofbeingr...
