Designation:E2677−14StandardTestMethodforDeterminingLimitsofDetectioninExplosiveTraceDetectors1ThisstandardisissuedunderthefixeddesignationE2677;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1InharmonywiththeJointCommitteeforGuidesinMetrology(JCGM)anddetectionconceptsoftheInternationalUnionofPureandAppliedChemistry(IUPAC)(1,2,3)2,thistestmethodusesaseriesofreplicatedmeasurementsofananalyteatdosagelevelsgivinginstrumentalresponsesthatbracketthecriticalvalue,atruncatednormaldistributionmodel,andconfidenceboundstoestablishastandardfordeterminingpracticalandstatisticallyrobustlimitsofdetectiontoanalytessampledonswabsbyexplosivetracedetectors(ETDs).1.2Here,thelimitofdetection(LOD90)isdefinedtobethelowestmassofaparticularcompounddepositedonasamplingswabforwhichthereis90%confidencethatasinglemea-surementinaparticularETDwillhaveatruedetectionprobabilityofatleast90%andatruenondetectionprobabilityofatleast90%whenmeasuringaprocessblanksample.1.3Thisparticulartestmethodwaschosenonthebasisofreliability,practicability,andcomprehensivenessacrosstestedETDs,analytes,anddeploymentconditions.Thecalculationsinvolvedinthistestmethodarepublishedelsewhere(4),andmaybeperformedconsistentlywithaninteractiveweb-basedtoolavailableontheNationalInstituteofStandardsandTechnology(NIST)site:http://pubapps.nist.gov/loda.1.4IntendedUsers—ETDdevelopers,ETDvendors,ETDbuyers,ETDtesters,ETDusers(firstresponders,securityscreeners,andthemilitary),andagenciesresponsibleforpublicsafetyandenablingeffectivedeterrentstoterrorism.1.5Whilethistestmethodmaybeappliedtoanydetectiontechnologythatproducesnumericaloutput,theprocedureshavebeendesignedforionmobilityspectrometry(IMS)basedETDsystemsandtestedwithlowvaporpressureexplosivecompounds.Compoundsaredepositedasliquidsolutionsonswabsanddriedbefo...
