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 Wysłany: Wto 19:32, 08 Lut 2011 Temat postu: tory burch shoes Improved flow injection catalytic |
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Improved flow injection catalytic spectrophotometric determination of trace formaldehyde in beer
yDdmology (AND HEALTH),[link widoczny dla zalogowanych], 2007,[link widoczny dla zalogowanych],17 (3): 404 ~ 406. DeterminationofFormaldehydeinBeeryFlowInjectionCoupledwithKineticSpectrophotometryChenl siumbromateinthephosphoricacidmediumwasusedforthedeterminationoftraceformaldehyde. itencoun. terstheproblemofahighertemperaturebubblesemergeinthereactiontube. Inthepresentexperiment, ade-bubblingdevicebyhome-madethree · wayjoint (T-piece) wasdevelopedinthiskineticspectr0ph0t0metricmethodcoupledwithflowinjection. 11letraceformaldehydeinbeersafterbeingdistillatedcouldbemeasured. Theresultsindicatedthatthemostabsorbancedifferencebetweenthecatalystandnon. catalystsystemscouldbeobtainedwhenthemixtureof1.0mol/Lofphosphoricacidand0.04mol/Lofbromateat1: 2 (v / v) reac-tedwith3.5 × 10mol/Lofcrystalvioletatthetemperatureof90 ℃ for60S. Undertheoptimizationcondi-tions, linearresponseofformaldehyderangedfrom0.05to2mg / L (r> 0.999). Thedetectionlimitmeas-uredwithllreplicatesofprocedurehlankandestimatedwith3. foldstandarddeviationwas2.49g / L. Therecoverytestystandardadditionsrangedfrom93.3% to102%. Theform ~ dehydecontentinthefivekindsofbeersmeasuredwaslowerthanthelimitofhygienicstandardoffermentedwinesofChinafGB/T5009.49-2003). Themethodwassuitableforthemeasurementoftraceformaldehydeinbeers. KeywordsKineticspectrophotometry, flowinjection,[link widoczny dla zalogowanych], formaldehyde,[link widoczny dla zalogowanych], beer (Received17July2007: accepted12November2007)
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