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1、WORLDWIDETestProcedureENGINEERINGGMW14236InteriorSTANDARDSDeterminationoftheReleaseofFormaldehydefromMoldedPartsfortheVehicleInterior3.1.2Aircirculatingovencapableofmaintaining1Scopetherequiredtemperaturetowithin±2°C.Thistestmethoddescribesameasuringprocess3.1.3Spectrophotometercapableofmeasuring
2、fordeterminingthereleaseofformaldehydefromabsorbanceintheregionof412nm.mouldedpartsforthevehicleinterior.Thetest3.1.4One(1)liter(L)polyethylenebottlewithhookmethodwaselaboratedwithreferencetoVDA275.implementintegratedinthecover(seeFigure1).Note:Nothinginthespecificationsupersedes3.2Reagents.appli
3、cablelawsandregulationsunlessspecific3.2.1Acetylacetone(analyticalgrade).exemptionhasbeenobtained.3.2.2Ammoniumacetate(analyticalgrade).Note:IntheeventofconflictbetweentheEnglishanddomesticlanguage,theEnglishlanguageshall3.2.3Iodinesolution(I2),concentration=takeprecedence.0.05mol/L.1.1Principle.
4、Forthistest,piecesofaparticular3.2.4Sodiumthiosulphate(Na2S2O3)massanddimensionarefastenedaboveconcentration=0.1mol/L.demineralizedwaterinasealed1-litre3.2.5Causticsodasolution(NaOH)concentrationpolyethylenebottleandstoredataconstant=1mol/L.temperatureforaspecifiedlengthoftime.Afterwards,thebottl
5、esarecooledandthe3.2.6Sulphuricacid(H2SO4)concentration=formaldehydeabsorbedinthedemineralizedwater1mol/L.isdetermined.Thequantityofformaldehydeis3.2.7Starchsolutionconcentration1%m/m.--`,,```,,,,````-`-`,,`,,`,`,,`---ascertainedasaproportionofthedryweight(μg/g)3.2.8Formaldehydesolution(analytica
6、lgrade)ofthetestpiece.37%.Theconcentrationofformaldehydeisdeterminedbyphotometricanalysisusingtheacetylacetone4TestPiecesandNumberofTestmethod.Inanaqueoussolution,formaldehydePiecesreactswithacetylacetoneinthepresenceofammoniumionstobecome3.5-diacetyl-1.4-4.1TakingofTestPieces.Thetestpiecesshalld
7、ihydrolutidine(DDL).Theresultingcolourbetakenfromsuitableandrepresentativepointscomplexisyellowwithmaximumabsorptionataspreadevenlyacrossthewidthofthemouldedwavelengthof412nm.part.Theymustbetaken50mmfromtheedgeofthemou
