Designation:D5012−20StandardPracticeforPreparationofMaterialsUsedfortheCollectionandPreservationofAtmosphericWetDeposition1ThisstandardisissuedunderthefixeddesignationD5012;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticepresentsrecommendationsforthecleaningofplasticorglassmaterialsusedforcollectionofatmosphericwetdeposition(AWD).Thispracticealsopresentsrecommen-dationsforthepreservationofsamplescollectedforchemicalanalysis.1.2ThematerialsusedtocollectAWDfortheanalysisofitsinorganicconstituentsandtraceelementsshouldbeplastic.Highdensitypolyethylene(HDPE)ismostwidelyusedandisacceptableformostsamplesincludingsamplesforthedeter-minationoftheanionsofacetic,citric,andformicacids.Borosilicateglassisacollectionalternativeforthedetermina-tionoftheanionsfromacetic,citric,andformicacid;itisrecommendedforsamplesforthedeterminationofotherorganiccompounds.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD1125TestMethodsforElectricalConductivityandResis-tivityofWaterD1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD1695Te...
