Designation:D6696−16StandardGuideforUnderstandingCyanideSpecies1ThisstandardisissuedunderthefixeddesignationD6696;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguidedefinesguidancebasedonaconsensusofviewpointsforinterpretationoftestresultstoidentifyvariouschemicalformsofcyanide.Itisintendedtoprovideageneralunderstandingofthechemicalnatureofdistinctcyanidespeciesasrelatedtochemicalanalysisandenvironmentalfateandtransport.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1426TestMethodsforAmmoniaNitrogenInWaterD3590TestMethodsforTotalKjeldahlNitrogeninWaterD6888TestMethodforAvailableCyanidewithLigandDisplacementandFlowInjectionAnalysis(FIA)UtilizingGasDiffusionSeparationandAmperometricDetectionD7237TestMethodforFreeCyanideandAquaticFreeCyanidewithFlowInjectionAnalysis(FIA)UtilizingGasDiffusionSeparationandAmperometricDetection3.Terminology3.1Definitions—Foradefinitionoftermsusedinthisguide,refertoTerminologyD1129.4.SignificanceandUse4.1Thisguideprovidesstandardterminologyforuseinidentifyinganddescribingthedifferentchemicalformsofcyanide.Thecomplexnatureofcyanidechemistry,existenceofnumerousdistinctchemicalformsaswellasthevariousregulatorydistinctionsthatmaybemadecanleadtoconfusionintechnicaldiscussionsoncyanideandintheselectionofappropriatemethodsforitsanalysis.Thisguideisintendedtoprovideclarificationandacommonframeworkoftermsanddefinitionstofacilitatediscussionsandreferencingdifferentcyanidechemicalspeciesandgroupsofcyanidecompounds.4.2Theuseofsuchcommonterminologyisparticularlyimportantfromanenvironmentalperspectivebecausecertainformsofcyanideareconsideredtobetoxic.Therefore,theirreleaseintotheenvironmentisregulated...
