微囊藻毒素的光降解研究.pdf

1、江南大學碩士學位論文微囊藻毒素的光降解研究姓名：戚莉莉申請學位級別：碩士專業(yè)：環(huán)境工程指導教師：阮文權鄒華20080601AbstraetAbstractWiththegraveconcernofpollutionandeutrophicationdegreeoffreshwateralgalbloomhasbecomemoreandmoreseriousThepotenttoxinmicrocystinisfrequentlyrele

2、asedduringcyanobacterialbloomsineutrophicwatersandmayimposearisktohumanhealthandenvironmentTheusualmicrocystinsinChinaareMC—RRandMC—LRThisthesisdiscussesmicrocystins’retentioncharacteristicandisolationconditionsbyusingHi

3、ghPerformanceLiquidChromatography，andoptimizespartsoftheanalysisstepsTakingwatersampleduringtheeutrophicationperiodinTaihulake，itoptimizestheconditionsofextractingandisolatingmicrocystinsItalsofocusesonthephotodegradatio

4、nofmicroeystinsbyirradiationwitllvariouspigments，suchaschlorophyll如flcarroteneandmixedpigmentincyanobacteriacellsThisthesisdiscussestheinfluencesofpigmentconcentrations，temperatures，intensitiesandpHtothephotodegradationT

5、hedeterminationconditionsofHPLCareasfollows：Mobilephase：acetonitrilewaterTFA(35：65：005)；flowrate：08ml／min；UVdetectionwavelength：239nm；injectionvolume：10mItisfoundthattheconcentrationofMC—LRandMCRRare030mg／Land116mg／Linth

6、eTaihulakeinJune，2007，itisfaroverthelimitationregulatedbyWHOTheefficiencyofextractionandpurificationismuchbetterwheneluting、析t1170％methanolfromSPE—C18andextracting、析廿l50％methan01Afterirritation謝廿1fluorescentlamp，theresul

7、tsshowasfollows：Underthetemperatureof30℃，4320pmol／m2slightintensityandMCLRconcentrationof5mg／L，誦mpigmentsconcentrationof05mg／m1thehalflifeofMCLRis1hourDifferentpigmentsolutionshavedifferentcatalyticeffectsduringphotodegr

8、adationresultsshowthatthemixedpigmentsinCyanobacteriacellshaveabettercatalyticeffectthantheboughtpigmentsMC—LRdegradationisalsomorefavorableinalkalineenvironmentwhentemperatureincreases，therateofphotodegradationwillalsob

9、ecomesfasterUndertheconditionsofpH9andtemperatureof40℃，thedegradationrateofMC—LRreaches7735肛g／11Inaddition，thelightintensityalsohasaneffectonphotodegradation，thehigherthelightintensityis，thefasterthephotodegradationreact