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时间:2019-02-27
《analysis and toxicology:分析和毒理学》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
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
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