Whenasoftdrinkbottleisopened,thepressureisreducedto theatmosphericpressure,causingdecompositionofthecarbonic acidreleasingCO2.Toavoidthisproblem,theadditionofNaOH tothesamplecansignificantlyreducethecarbonicacidconcentrationduetotheformationofNa2CO3andNaHCO3. TheeffectofCO2ontheextractionofTHMsfromsoftdrinkwas studiedcomparingtheextractionefficiencyofaddingornotadding150lLofNaOH6molL1toa20mLsoftdrinksample.CARPDMSfibre,extractiontimeof10min,extractiontemperatureat 20Candstirringmagneticspeedof500rpmwereusedinthis study.AscanbeseenfromFig.1,thebestextractionefficiencyoccurswithadditionofNaOH6molL1,exceptforchloroformwhich isthemorevolatileofthetargetanalytes.Theimprovementofthe extractionefficiencyfortheotherTHMswasupto35%.Theanalytesarereleasedfromtheaqueousphasetothegasphasewhen
Whenasoftdrinkbottleisopened, thepressureisreducedto theatmosphericpressure, causingdecompositionofthecarbonic acidreleasingCO2.Toavoidthisproblem,theadditionofNaOH tothesamplecansignificantlyreducethecarbonicacidconcentrationduetotheformationofNa2CO3andNaHCO3 TheeffectofCO2ontheextractionofTHMsfromsoftdrinkwas studiedcomparingtheextractionefficiencyofaddingornotadding150lLofNaOH6molL1toa20mLsoftdrinksample.CARPDMSfibre,extractiontimeof10min,extractiontemperatureat 20Candstirringmagneticspeedof500rpmwereusedinthis ศึกษาAscanbeseenfromFig.1,thebestextractionefficiencyoccurswithadditionofNaOH6molL1,exceptforchloroformwhich isthemorevolatileofthetargetanalytesTheimprovementofthe extractionefficiencyfortheotherTHMswasupto35%Theanalytesarereleasedfromtheaqueousphasetothegasphasewhen
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whenasoftdrinkbottleisopened thepressureisreducedto theatmosphericpressure causingdecompositionofthecarbonic , , acidreleasingco2 . toavoidthisproblem theadditionofnaoh , tothesamplecansignificantlyreducethecarbonicacidconcentrationduetotheformationofna2co3andnahco3 .theeffectofco2ontheextractionofthmsfromsoftdrinkwas studiedcomparingtheextractionefficiencyofaddingornotadding150llofnaoh6moll1toa20mlsoftdrinksample . carpdmsfibre extractiontimeof10min extractiontemperatureat 20candstirringmagneticspeedof500rpmwereusedinthis , , การศึกษา ascanbeseenfromfig 1 thebestextractionefficiencyoccurswithadditionofnaoh6moll1 , ,exceptforchloroformwhich isthemorevolatileofthetargetanalytes . theimprovementofthe theanalytesarereleasedfromtheaqueousphasetothegasphasewhen extractionefficiencyfortheotherthmswasupto35 %
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