Designation:D2036−09(Reapproved2022)StandardTestMethodsforCyanidesinWater1ThisstandardisissuedunderthefixeddesignationD2036;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationofcyanidesinwater.Thefollowingtestmethodsareincluded:SectionsTestMethodATotalCyanidesafterDistillation12–18TestMethodBCyanidesAmenabletoChlorination2byDifference19–25TestMethodCWeakAcidDissociableCyanides26–32TestMethodDCyanidesAmenabletoChlorinationwithoutDistillation(Short-CutMethod)33–391.2Cyanogenhalidesmaybedeterminedseparately.NOTE1—Cyanogenchlorideisthemostcommonofthecyanogenhalidecomplexesasitisareactionproductandisusuallypresentwhenchlorinatingcyanide-containingindustrialwastewater.ForthepresenceorabsenceofCNCl,thespottestmethodgiveninAnnexA1canbeused.1.3Thesetestmethodsdonotdistinguishbetweencyanideionsandmetallocyanidecompoundsandcomplexes.Furthermore,theydonotdetectthecyanates.Cyanatescanbedeterminedusingionchromatographywithoutdigestion.NOTE2—Thecyanatecomplexesaredecomposedwhenthesampleisacidifiedinthedistillationprocedure.1.4Thecyanideincyanocomplexesofgold,platinum,cobaltandsomeothertransitionmetalsisnotcompletelyrecoveredbythesetestmethods.RefertoTestMethodD6994forthedeterminationofcyanometalcomplexes.1.5Cyanidefromonlyafeworganiccyanidesarerecovered,andthoseonlytoaminorextent.1.6Partorallofthesetestmethodshavebeenusedsuccessfullywithreagentwaterandvariouswastewaters.Itistheuser’sresponsibilitytoassurethevalidityofthetestmethodforthewatermatrixbeingtested.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itis...
