Designation:D6903−07(Reapproved2013)StandardTestMethodforDeterminationofOrganicBiocideReleaseRateFromAntifoulingCoatingsinSubstituteOceanWater1ThisstandardisissuedunderthefixeddesignationD6903;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthelaboratorydeterminationoftherateatwhichorganicbiocideisreleasedfromanantifoul-ingcoatingexposedinsubstituteoceanwater.ThetestisrunentirelyinthelaboratoryundercontrolledconditionsofpH,temperature,salinity,andhydrodynamics.Analyticalproce-duresareprovidedforthedeterminationofthereleaserateof4,5-dichloro-2-n-octylisothiazolin-3-one(DCOIT),zincandcopperpyrithione(ZPTandCuPT),andN-cyclopropyl-N'-(1,1-dimethylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine(CDMTD).Atpredeterminedintervals,substituteoceanwatersamplesareanalyzedforleachedbiocideusingasuitableanalyticaltechnique.1.2Incasesinwhichtheantifoulingcoatingcontainsbothanorganicbiocideandacopper-basedbiocide,thereleaserateofcoppermayoptionallybeconcurrentlydeterminedaccord-ingtotheprocedurefoundinTestMethodD6442.1.3Theprocedurecontainsthepreparationstepsforthedeterminationofthereleaserateofbiocideinsubstituteoceanwaterfromantifoulingpaintsincludingapparatus,reagents,holdingtankconditions,andsamplingpointdetails.TheprocedurecallsfortheaccuratedeterminationoforganicbiocideconcentrationsinsubstituteoceanwateratthelowµgL-1(partsperbillion,ppb)level.Todetectandcorrectforreagentimpuritiesandallowasuitablelevelofanalyticalprecisiontobeachieved,theanalyticalmethodtobeusedforthedeterminationoftheconcentrationoforganicbiocideinsubstituteoceanwatermustmeettheacceptabilitycriteriagiveninAnnexA2.WhereAnnexA2specifiesalimitofquantitation(LOQ),theprocedurefordeterminingtheLOQfortheorganicbiocideinsubstituteoceanwaterbytheanalyticalmethodpresentedinAnne...
