Effect of nutrient conditions on the toxicity of naphthalene to Chlorella pyrenoidosa英文资料

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1、JournalofEnvironmentalSciences2011,23(2)307–314EectofnutrientconditionsonthetoxicityofnaphthalenetoChlorellapyrenoidosaQingxiaKong1;3,LizhongZhu1,2,,XueyouShen1;21.DepartmentofEnvironmentalScience,ZhejiangUniversity,Hangzhou310028,China.E-mail:zlz@z

2、ju.edu.cn2.ZhejiangProvincialKeyLaboratoryofOrganicpollutionProcessandControl,ZhejiangUniversity,Hangzhou310028,China3.DepartmentofFisheriesScience,TianjinAgricultureUniversity,Tianjin300384,ChinaReceived05March2010;revised26April2010;accepted06May20

3、10AbstractThetoxicityofnaphthalenetoafreshwatermicroalga,Chlorellapyrenoidosa,andthesubsequentrecoveryofalgaefromthedamagewereinvestigatedundertwonutrientconditions,eitherenrichedwithnitrogen(N)andphosphorus(P),orstarvedofNandP.ResultsshowedthatC.pyr

4、enoidosawasmoresensitivetonaphthaleneunderN,P-enrichedcondition,andtheinhibitoryrategenerallyincreasedatfirstandthendecreasedgraduallywiththeevaporationofnaphthaleneunderbothnutrientconditions.EnrichedN,Preducedtheinhibitoryrateatinitialnaphthalenecon

5、centrationof5and10mg/L,butenhanceditat100mg/L,atwhichmoresevereultrastructuredamageswerefoundthanthoseunderN,P-starvedcondition.Observeddamagesincludedpartlyortotallydisappearanceofnucleolus,nuclear,andplasmamembranes.Accordingtothechlorophyllcontent

6、andcelldensitymeasurements,C.pyrenoidosacouldrecoverfromnaphthalenedamagewithinitialconcentrations650mg/Lin7daysunderbothnutrientconditions,whiletheycouldnotrecoveriftheinitialconcentrationofnaphthalenewasat100mg/L.UndertheN,P-starvedcondition,theina

7、bilityofC.pyrenoidosatorecoverfromthenaphthalenedamagewasconsistentwiththeresultsofhighinhibitoryrate,lowvalueofspecificgrowthrate(SGR,0.05day1),andtheseveredestructionofcellstructure.However,undertheN,P-enrichedconditions,theobservedlowerinhibitoryr

8、ate,highervalueofSGR(0.55day1),andtheintactcellstructureofmostcellssuggestedthatalgaecouldpotentiallyrecoverfromthenaphthalenedamage.Keywords:Chlorellapyrenoidosa;naphthalene;toxicity;nutrientconditionsDOI:10.1016/S1001-0742(10)60407-XCitation:KongQ