ISO 7012-1 2025.docx

InternationalStandardISO7012-1Firstedition2025-04Paintsandvarnishes一Determinationofpreservativesinwater-dilutablecoatingmaterials一Part1:Determinationofin-canfreeformaldehydePeinturesetvernisDosagedesagentsdepreservationdanslesproduitsdepeinturediluablesaYeau一Partie1:DosageduformaldehydeIibreenpotReferencenumberISO7012-l:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandPageContentsForewordv1 Scope12 Normativereferences13 Termsanddefinitions14 Principle34.1 General34.2 Equilibriaofin-canfreeformaldehydeinthecoatingmatrix34.3 Equilibriaofin-canfreeformaldehydeduringextraction34.4 Equilibriaofin-canfreeformaldehydeduringderivatization34.5 PrincipleofMethodA:Derivatizationwithacetylacetone(ACAC)combinedwithphotometricdetection34.5.1 DerivatizationwithACAC34.5.2 Detectionandquantificationwithaspectralphotometer44.6 PrincipleofMethodB:Derivatizationwithdinitrophenylhydrazine(DNPH)combinedwithliquidchromatography(LC)separationandUV/VISdetection44.6.1 DerivatizationwithDNPH44.6.2 Separation,detectionandquantificationwithLC-UV/VIS44.7 PrincipleofMethodC:Liquidchromatography(LC)separationfollowedbypost-columnderivatizationwithACACandsubsequentquantificationwithUV/VISdetection44.7.1 Separationoffreeformaldehydebyliquidchromatography44.7.2 Post-columnderivatizationwithacetylacetone(ACAC)andquantificationwithUV/VISdetection45 Apparatus423.4.55.5.5.LHGeneralapparatus4Apparatusforextraction4ApparatusformethodA5ApparatusformethodB55.5.1 LCHPLCorultra-performanceliquidchromatography(UHPLC)system55.5.2 Appropriatecolumn55.6ApparatusformethodC65.6.1 LCHPLCorultra-performanceliquidchromatography(UHPLC)systemwithpost-columnreactor65.6.2 Appropriatecolumn(e.g.RPC8,RPC18column)66 Reagentsandmaterials66.1 General.66.2 Generalreagents66.2.1 Demineralizedwater66.2.2 Formaldehydesolution66.2.3 Formaldehydestocksolution66.2.4 Formaldehydeworkingsolutionsforcalibration66.2.5 Carrezsolutions(optional)76.3 MethodA:ReagentsforderivatizationwithACAC76.4 MethodB:ReagentsforderivatizationwithDNPH76.5 MethodC:Reagentsforpost-columnderivatizationwithACAC76.6 Reagentsfortitrationofformaldehydestandard87 Procedure87.1 Sampling87.2 Extraction87.3 AnalysisanddetectionofMethodA97.3.1 ProcedureforderivatizationwithACAC97.3.2 Photometricanalysisofcalibrationsolutions97.3.3 Samplemeasurementforphotometricanalysis107.3.4 Quantificationofthein-canfreeformaldehydecontent107.4 AnalysisanddetectionofMethodB107.4.1 ProcedureforderivatizationwithDNPH107.4.2 Operationconditions117.4.3 Blankdetermination117.4.4 Analysisofcalibrationsolution117.4.5 Samplemeasurement117.4.6 Qualitycheck127.4.7 Calculationofin-canfreeformaldehydecontent127.5 AnalysisanddetectionofMethodC127.5.1 Operationconditions127.5.2 Blankdetermination127.5.3 Analysisofcalibrationsolution127.5.4 Samplemeasurement137.5.5 Qualitycheck137.5.6 Calculationofin-canfreeformaldehydecontent138 Precision148.1 General148.2 Repeatabilitylimit,r148.3 Reproducibilitylimit,R149 Testreport14Annex A (normative)Titrationmethodsforthedeterminationofformaldehydecontent16Annex B (informative)ExampleofHPLCconditionsformethodB18Annex C (informative)ExampleofHPLCconditionsformethodC19Annex D (informative)Resultsoftheinterlaboratorytest20Bibliography21ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationo