Designation:D6568−00(Reapproved2011)StandardGuideforPlanning,CarryingOut,andReportingTraceableChemicalAnalysesofWaterSamples1ThisstandardisissuedunderthefixeddesignationD6568;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisguidesetsaprotocolforgeneratingandreportingchemicalanalysesthataretraceabletoSIunitsortocertifiedreferencematerialsinlaboratoriesthatservethewaterandenvironmentalindustry.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1129TerminologyRelatingtoWaterD6362PracticeforCertificatesofReferenceMaterialsforWaterAnalysisIEEE/ASTMSI10–1997StandardforuseoftheInterna-tionalSystemofunits(SI):themodernmetricsystem2.2OtherDocuments:ISOGuide17025GeneralRequirementsfortheCompetenceofCalibrationandTestingLaboratories2ISOGuide30Termsanddefinitionsusedinconnectionwithreferencematerials2InternationalVocabularyofBasicandGeneralTermsinMetrology[VIM]:ISO:2nded.,199323.Terminology3.1Definitions:3.1.1FordefinitionsoftermsusedinthisGuide,refertoD1129.3.1.2certifiedreferencematerial—referencematerial,ac-companiedbyacertificate,oneormoreofwhosepropertyvaluesarecertifiedbyaprocedurewhichestablisheditstraceabilitytoanaccuraterealizationoftheunitinwhichthepropertyvaluesareexpressed,andforwhicheachcertifiedvalueisaccompaniedbyanuncertaintyatastatedlevelofconfidence.(ISOGuide30)(Note1).NOTE1—Thereissignificantvariationintheoverallqualityofcommerciallyavailablecertifiedreferencematerialsandcautionshouldbeusedwhenchoosingcertifiedreferencematerials.UsePracticeD6362toprovideguidanceastowhatinformationneedstobeincludedonCertificat...
