analysis and toxicology：分析和毒理学

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1、ANALYSISANDTOXICOLOGYOFLEMAITRESMOKEFLUIDSbyDr.B.A.ColenuttChemistryDept,BrunelUniversity,Uxbridge,Middx.UB83PHFebruary,19851.INTRODUCTIONLeMaitresmokefluidsarematerialssuppliedbyLeMaitreforuseintheirsmokegenerators.Areservoirischargedwiththewater-basedfluids,whichareforcedbypneumaticp

2、ressureintoaheatedchamber.Herethefluidisimmediatelyvaporizedandexpands.Onpassingintotheatmosphereamistorsmokeisformedasaresultofcondensationofthevaporizedmaterial.AseriesoftestshavebeencarriedoutonthetwoLeMaitresmokefluidsandthesmokegeneratedfromthem.Theobjectivesofthetestswere:i)Tocon

3、firmthatthecompositionofthefluidswereasstatedbythemanufactures.ii)Toestablishwhetherthewatersolubleorganiccomponentswereinvolvedinanychemicalreactionduringsmokegeneration.iii)Todeterminethenatureoftheproductsofanysuchreactions.iv)Toreviewtheavailableevidenceforthesafetyoftheatmospheres

4、generatedparticularlyinrespectofindividualswhowouldbeexposedtotheatmospheres.Theexperimentalworkprimarilyinvolvedthetechniqueofgas-liquidchromatography.Thisisasophisticatedinstrumentaltechniqueforthepreciseanalysisofmixturesofvolatileorganiccompounds.Mixturesarepassedthroughacolumninas

5、treamofcarriergas.Variouscomponentsofthemixturemovethroughthecolumnatdifferentratesandthustheindividualcomponentsarriveattheendofthecolumnatdifferenttimes,thatis,themixtureisseparated.Columneffluentismonitoredbyahighlysensitivedetector.Thetimeofpassagethroughthecolumnischaracteristicof

6、aparticularsubstanceandthesizeofthesignalfromthedetectorisanaccuratemeasureoftheamountofsubstance.2.EXPERIMENTALANDRESULTS2.1LeMaitreFluidA2.1.1.AnalysisofthefluidThecompositionofthefluidwassuppliedandtheretestsweretoconfirmthecomposition.Standardsamplesofthecomponentspropyleneglycolan

7、dwaterwereobtainedandananalyticalprocedurefortheiranalysiswasdeveloped.Detailsoftheanalysisaregivenintable1.Althoughthesystemshouldnotproducearesponsetowatertherewasinfactanearlypeakattributabletothecompound.Thisartifactisnotunusualandcreatednoproblem.Propyleneglycolelutedasasymmetri