Designation:D7572−15(Reapproved2022)StandardGuideforRecoveryofAqueousCyanidesbyExtractionfromMineRockandSoil1ThisstandardisissuedunderthefixeddesignationD7572;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideisapplicableforthecollection,extraction,andpreservationofextractsfromminerockandsoilsamplesfortheanalysisofcyanideintheextracts.Responsibilitiesoffieldsamplingpersonnelandthelaboratoryareindicated.1.2Thesampling,preservation,andextractionproceduresdescribedinthisguidearerecommendedfortheanalysisoftotalcyanide,availablecyanide,weakaciddissociablecyanide,andfreecyanidebyTestMethodsD2036,D4282,D4374,D6888,D6994,D7237,andD7284.Theinformationsuppliedinthisguidecanalsobeappliedtootheranalyticalmethodsforcyanide,forexample,USEPAMethod335.4.1.3Theprocedureoptionsmethodsappearinthefollowingorder:ProcedureOptionSectionsOptionALaboratoryProcessingofFieldPreservedSamples11and12OptionBLaboratoryProcessingofMoistFieldSamples13and141.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD1293TestMethodsforpHofWaterD2036TestMethodsforCyanidesinWaterD3694PracticesforPrepar...
