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1、GModelHAZMAT-13564;No.ofPages10ARTICLEINPRESSJournalofHazardousMaterialsxxx(2011)xxx–xxxContentslistsavailableatSciVerseScienceDirectJournalofHazardousMaterialsjournalhomepage:www.elsevier.com/locate/jhazmatBio-precipitationofuraniumbytwobacterialisolatesrecoveredfromextremeenvir
2、onmentsasestimatedbypotentiometrictitration,TEMandX-rayabsorptionspectroscopicanalysesMohameda,b,∗a,1c,da,2L.Merroun,MartaNedelkova,JesusJ.Ojeda,ThomasReitz,MargaritabbcaLópezFernández,JoséM.Arias,MaríaRomero-González,SonjaSelenska-PobellaInstituteofRadiochemistry,HelmholtzCentre
3、Dresden-Rossendorf,Dresden,GermanybDepartamentodeMicrobiología,UniversidaddeGranada,CampusFuentenuevas/n18071,Granada,SpaincCell-MineralInterfaceResearchProgramme,KrotoResearchInstitute,UniversityofSheffield,BroadLane,SheffieldS37HQ,UKdExperimentalTechniquesCentre,BrunelUniversity,
4、Uxbridge,MiddlesexUB83PH,UKarticleinfoabstractArticlehistory:ThisworkdescribesthemechanismsofuraniumbiomineralizationatacidicconditionsbyBacillussphaer-Received21January2011icusJG-7BandSphingomonassp.S15-S1bothrecoveredfromextremeenvironments.TheU–bacterialinReceivedrevisedform27
5、August2011interactionexperimentswereperformedatlowpHvalues(2.0–4.5)wheretheuraniumaqueousspe-Accepted13September2011ciationAvailableonlinexxxisdominatedbyhighlymobileuranylions.X-rayabsorptionspectroscopy(XAS)showedthatthecellsofthestudiedstrainsprecipitateduraniumatpH3.0and4.5as
6、auraniumphosphatemineralphaseKeywords:belongingtothemeta-autunitegroup.Transmissionelectronmicroscopic(TEM)analysesshowedstrain-specificUraniumlocalizationoftheuraniumprecipitates.InthecaseofB.sphaericusJG-7B,theU(VI)pre-biomineralizationcipitatetitrationwasboundtothecellwall.Wher
7、easforSphingomonassp.S15-S1,theU(VI)precipitateswerePotentiometricobservedbothonthecellsurfaceandintracellularly.TheobservedU(VI)biomineralizationwasassoci-XASatedTEM/EDXwiththeactivityofindigenousacidphosphatasedetectedatthesepHvaluesintheabsenceofanorganicphosphatesubstrate.The
8、biomineralizationofuraniumwasnotobserved
