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1、OrganicGeochemistryOrganicGeochemistry37(2006)957–976www.elsevier.com/locate/orggeochemLignitedegradationandmineralizationinlignite-containingminesedimentasrevealedby14Cactivitymeasurementsandmolecularanalysisa,b,*bcAbadChabbi,CorneliaRumpel,PieterM.Grootes,dedJose´A.Gonza´lez-Pe´rez,RolandD.Delaun
2、e,FranciscoGonzalez-Vila,faBrigitteNixdorf,ReinhardF.Hu¨ttlaDepartmentofSoilProtectionandRecultivation,BTUCottbus,Cottbus,GermanybCNRS,LaboratoiredeBioge´ochimiedesMilieuxContinentaux,Grignon,FrancecLeibnizLaborfu¨rAltersbestimmungundIsotopenforschung,Universita¨tKiel,GermanydInstitutodeRecursosNat
3、uralesyAgrobiologı´adeSevilla,CSIC,Sevilla,SpaineLouisianaStateUniversity,WetlandBiogeochemistryInstitute,BatonRouge,USAfDepartmentofFreshwaterConservation,BTUCottbus,Cottbus,GermanyReceived4June2005;receivedinrevisedform5December2005;accepted8February2006Availableonline27June2006AbstractTheinfluenc
4、eofsedimentpHandredoxconditionsontheoxidationofligniteandsedimentorganiccarbonwasstudiedusingaseriesoflaboratorymicrocosms.Theexperimentwasconductedover450dinreducingsedimentsuspensionsmain-tainedatfourredoxpotentials(170,0,+350and+500mV)andtwopHvalues(3.2and5.3).Carbonandlignitemin-1413eralizatio
5、nweredeterminedovertimeusingCanalysis,DOCcarbonproduction,solidstateCNMR(nuclearmagneticresonancespectroscopy)andpyrolysis–gaschromatography/massspectrometry(GC/MS).Morethan50%ofmeasuredcarbonmineralizationoccurredduringthefirst200d.Maximummineralizationoccurredunderthemoreoxidizingcon-ditions.Theam
6、ountofCO2producedwasgreateratpH5.3thanatpH3.2,indicatingthatlowpHreducesorganicmatter14mineralizationregardlessofsedimentredoxpotential.TheCanalysisshowedthatlignitecarbonwasmineralizedateachredoxpotentiallevel.Underthelowestredoxlevel(170mV)mineralizationwasminimalascomparedtotheotherredox13level
7、s.Pyrolysis–GC/MSshowedthatthedissolvedaromaticfractionaccumulatedinsolution.SolidstateCNMRspec-troscopyanalysisshowedthatlignite,althoughgenerallyrecalcitrantinnature,wasstructurallydiverse,includingcontai
