Designation:D6956−17StandardGuideforDemonstratingandAssessingWhetheraChemicalAnalyticalMeasurementSystemProvidesAnalyticalResultsConsistentwithTheirIntendedUse1ThisstandardisissuedunderthefixeddesignationD6956;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidedescribesanapproachfordemonstratingthequalityofanalyticalchemicalmeasurementresultsfromtheapplicationofameasurementsystem(thatis,methodorsequenceofmethods)totheanalysisofenvironmentalsamplesofsoil,water,air,orwaste.Thepurposeofsuchmeasurementscanincludedemonstratingcompliancewitharegulatorylimit,determiningwhetherasiteiscontaminatedabovesomespeci-fiedlevel,ordeterminingtreatmentprocessefficacy.1.2Thisguidedescribesaprocedurethatcanbeusedtoassessameasurementsystemusedtogenerateanalyticalresultsforaspecificpurpose.Usersandreviewersoftheanalyticalresultscandetermine,withaknownlevelofconfidence,iftheymeetthequalityrequirementsandaresuitablefortheintendeduse.1.3Thisprotocoldoesnotaddressthegeneralcomponentsoflaboratoryqualitysystemsnecessarytoensuretheoverallqualityoflaboratoryoperations.Forsuchsystems,theuserisreferredtoInternationalStandardsOrganization(ISO)Stan-dard17025ortheNationalEnvironmentalLaboratoryAccredi-tationConference(NELAC)laboratoryaccreditationstan-dards.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofIn...
