Designation:D6956−11StandardGuideforDemonstratingandAssessingWhetheraChemicalAnalyticalMeasurementSystemProvidesAnalyticalResultsConsistentwithTheirIntendedUse1ThisstandardisissuedunderthefixeddesignationD6956;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-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryrequirementspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4687GuideforGeneralPlanningofWasteSamplingD5283PracticeforGenerationofEnvironmentalDataRe-latedtoWasteManagementActivities:QualityAssurancean...
