Designation:D6363−20StandardTestMethodforDeterminationofHydrogenPeroxideandCombinedOrganicPeroxidesinAtmosphericWaterSamplesbyPeroxidaseEnzymeFluorescenceMethod1ThisstandardisissuedunderthefixeddesignationD6363;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofhydroperoxides,whichincludehydrogenperoxide(H2O2)andcombinedorganicperoxides,insamplesofatmosphericwaterbythemethodofhorseradishperoxidasederivatizationandfluorescenceanalysisofthederiveddimer.2,31.2Therangeofapplicablehydrogenperoxideconcentra-tionswasdeterminedtobe0.6–176.0×10−6Mfromindepen-dentlaboratorytestsofthetestmethod.1.3Theprimaryuseofthetestmethodisforhydrogenperoxide,butitmayalsobeusedtoquantitateorganichydroperoxides.Determinationsoforganichydroperoxidecon-centrationlevelsupto30×10−6Mmaybeadequatelyobtainedbycalibrationwithhydrogenperoxide.2,3Whileorganichydroperoxideshavenotbeendetectedatsignificantconcentrationlevelsinrainorcloudwater,theirpresencemaybetestedbyoperationofthetestmethodwiththeadditionofcatalasefordestructionofH2O2.31.4Becauseoftheinstabilityofhydroperoxidesinatmo-sphericwatersamples,propersamplecollection,at-collectionderivatization,andstringentqualitycontrolareessentialas-pectsoftheanalyticalprocess.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInter...
