专业英语需要讲的.ppt

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1、SystemforbiodegradabilityevaluationonleatherusedinthefootwearindustrySpeaker：WuCongxiPart1IntroductionThetanningprocessturnsleatherintoaresistant,durablematerialwith40ormoreyearsoflifecycle.Thedisposalofthesesolidwasteimpliesahigheconomicaswellasenvironmentalcost.Soweneedtoknowwhetherak

2、indoftannedleatherishardoreasytobiodegraded.Becauseofsuchreason,INESCOPdevelopsomeequipmentthatcouldquicklymeasurethedegradationofleatherundercontrolledconditions.Method1:IndirectCO2measurementbymeansofBa(OH)2.Theprototypebiodegradationequipmentforindirectmeasurementbymeansofbariumhydrox

3、idewasdevelopedasanopensystemforthemeasurementofCO2evolvedduringleatherbiodegradationbyaerobicmicroorganisms.Pre-treatmentflasks︷︸ReactionflasksAnalysisbottles空气ThemechanismofthisbiodegradabilityevaluationTheprincipleofthemeasuringmethodologyisbasedontheBa(OH)2reactionwiththeCO2evolved,B

4、iodegradabilityisassessedbyindirectlymeasuringtheCO2evolvedasafunctionoftimeandcalculatingthebiodegradabilitydegreebythedifferenceinsolubleorganiccarboncontentthathasnotbeentransformedintoCO2inthecourseoftheprocess.collagenbacteriumCO2MediumwithoutorganicmatterAfterthat…CO2+Ba(OH)2=BaCO3

5、↓+H2O,Theremainingbariumhydroxidecanbemeasureby0.1Nofhydrochloricacidhydrochloric.FromthequantitybariumofhydroxideusedupwecanknowtheyieldofcarbondioxideTheremainingBa(OH)2DirectCO2measurementbyaninfrared(IR)detectorMethod2:ThebiodegradationprototypefordirectCO2measurementhasbeenconceived

6、byINESCOPasaclosedsystemformeasuringtheleatherbiodegradationprocessbyaninfraredtechnologysensor.Asastartingpoint,andbeforeputtingtheleathersampleintotheflask,theaerationoftheculturemediumandtheinoculumispromotedbyagasmixturecomprisedofoxygenandnitrogen.Asthemicroorganismsdegradetheleathe

7、rsampleforwhichoxygendissolvedintheculturemediumisused,CO2generationtakesplaceasaresultofdegradation.TheCO2isthenmeasuredbytheIRdetector.NOTE!TheIRsensor’sdetectionrangeis0-5%CO2,althoughassoonasa3%CO2concentrationisattained,thesystemispurgedwithO2inordertoreducetheCO2con