洱海沉积物有机质铁锰对磷的赋存特征和释放影响

24420114ResearchofEnvironmentalSciencesVol.24N[e-mail].*[e-mail]、、1212*222231.1230002.1000123.075131SMTOMFeMn.wTP710.3～1961.2mg/kgwCa-P36.9%～59.2%wOP24.6%～36.9%wFe/Al-P9.8%～20.7%wOM25.0～119.6mg/gwTPwCa-Pw0.8～3.8mg/gw34.3～127.2mg/gwTP.wFe/Al-P/wCa-P0.5w/wTP20wTOC/wOP200.wTPFeo-FepFed-FeoFeo-FepFeo-Fep.X524A1001－6929201104－0371－07EffectsofOrganicMatterManganeseandIrononPhosphorusFractionsandReleaseintheSedimentsofErhaiLakeZHANGShi-jun12QIQing-jie1WANGSheng-rui2JIAOLi-xin2JINXiang-can2YANGSu-wen2ZHAOHai-chao231.CollegeofResourceandEnvironmentalEngineeringLiaoningTechnicalUniversityFuxin123000China2.StateEnvironmentalProtectionKeyLaboratoryforLakePollutionControlResearchCenterofLakeEco-environmentChineseResearchAcademyofEnvironmentalSciencesBeijing100012China3.DepartmentofAgriculturalScienceHebeiNorthUniversityZhangjiakou075131ChinaAbstractThecontentsandfractionsofphosphorusPinsurfacesedimentsoftheErhaiLakewerestudiedbytheStandardMeasurementandTestSMTphosphoroussequentialextractionandclassificationprocedure.TheeffectsoforganicmatterOMFeandMnonPfractionsandreleasewereinvestigatedandthepotentialPreleaseriskofthesedimentswasassessed.TheresultsindicatedthatthecontentoftotalphosphorusTPvariedintherangeof710.3-1961.2mg/kgofwhichwCa-Pwasthehighest36.9%-59.2%followedbywOP24.6%-36.9%whilewFe/Al-Pwasthelowest9.8%-20.7%.TheOMcontentrangedfrom25.0mg/gto119.6mg/gwhichwasnegativelyandsignificantlycorrelatedwiththecontentsofTPandCa-P.ThecontentsoftotalmanganeseMntandtotalironFetwere0.8-3.8mg/gand34.3-127.2mg/grespectivelyshowingsignificantlypositivecorrelationswiththecontentsofTPandvariousPfractions.TheratioofwFe/Al-P/wCa-Pwaslowerthan0.5whilethatofwFet/wTPwasmuchlargerthan20indicatinglowPreleasefromthesediments.HoweverthewTOC/wOPratiowaslowerthan200indicatingahigherriskforpotentialreleaseofOP.ThecontentsofTPandP-fractionsweresignificantlyandpositivelycorrelatedwiththeamorphousFeoxidesFeo-FepthoughtheircorrelationwiththecrystallineFeoxidesFed-Feowasnotsignificant.InadditionmoreFeoxidesinthesedimentswereFeo-FepwhileasmallquantitywasFed-FeowhichsuggestedthatPreleasefromthesedimentsofErhaiLakewasmainlycontrolledbyFeo-Fep.KeywordsErhaiLakephosphorusironoxidesorganicmattermanganesecrystallineformamorphousformDOI10.13198/j.res.2011.04.11.zhangshj.00624.21.Feo2.ROOS3Fe-PFeo〔Fe-P/Feo〕.4-5.6.、、.OM、、－57.8-9、.wTP、ρTP.、、、.11.11710～10cm1.65mm0.15mm.1.2pHpH〔v∶w2.5∶1〕9.SMT11/Fe/Al-P、Ca-P、1Fig.1SketchmapofsamplingsitesIP、OPTP.FetMntwICP－AES.－－DCBFed12pH3.2Feo13Fep14ICP－AES.1.3SPASS16.0Pearson.22.1wTPwTP2.wTP710.30～1961.23mg/kg967.59mg/kg.wTP7172358wTP1467.1516wTP7～17wTP.2.wCa-P36.92%～59.19%wOP24.55%～36.89%2734、、wFe/Al-P9.75%～20.66%.7wTPwCa-P2wFe/Al-P14wOP17.wFe/Al-PwCa-PwTPwOP.2Fig.2DistributionofTPandvariousPfractionsinsurfacesedimentsoftheErhaiLake2.2wOMwMntwFetwOMwMntwFet3.wOM25.0～119.6mg/g49.1mg/gwMnt0.8～3.8mg/g1.6mg/gwFet34.3～127.2mg/g60.2mg/g.wOM272358wOM63.9mg/g146733.8mg/g.21～11wOM12～17.wMntwFetwOMwTPwMntwFet722358wMntwFet1467wMntwFet28.0%18.4%.101516wMnt7～17wMntwFet.3wOMwFetwMntFig.3DistributionofOMMntandFetcontentsinsurfacesedimentsoftheErhaiLake4.wFed11.7～56.8mg/gwFet23.6%～57.0%.wFeo-Fep7.7～44.7mg/gwFed39.1%～82.9%wFed-Feo1.3～19.0mg/gwFed9.8%～57.7%wFep1.0～1.7mg/gwFed3.0%～8.3%.wFeo-FepwFetwFed7237324.wFed-FeowFetwFed1114wFed-Feo.wFep7.2.3wOMwFewMnwTP1.1wMntwFet4Fig.4DistributionofvariousFefractionsinsurfacesedimentsfromErhaiLake1wOMwFewMnwPTable1ThecorrelationsbetweenwOMwFewMnandwPinsurfacesedimentsoftheErhaiLakewFetwOMwFedwFepwFed-FeowFeo-FepwMntwTPwFe/Al-PwCa-PwOM－0.587*wFed0.821－0.547*wFep0.540*－0.2030.646wFed-Feo0.404－0.4670.6220.075.wFeo-Fep0.810－0.4370.9150.7500.254wMnt0.936－0.516*0.6980.7050.3290.689wTP0.832－0.502*0.9130.8540.3310.9550.812wFe/Al-P0.742－0.4330.8200.9220.2480.8790.8140.965wCa-P0.851－0.549*0.9230.6810.3280.9730.6900.9400.844wOP0.732－0.2590.7880.8910.2280.8510.8320.9270.9330.809*0.050.01n=17.P0.01wOMP0.05wTPP0.01wMntwFetwFeo-FepP0.01wTP4734、、wCa-PwOM.①、2.②、、、15、.33.1.Fe/Al-PFe3+OH－PO43－16-17.Ca-P1819.20wFe/Al-P/wCa-PwFe/Al-P/wCa-P0.5wFe/Al-P/wCa-P0.5.wFet/wTPwFet/wTP1520Fe21.OPIP20.wTOC/wOPOPwTOC/wOP300OP200OP22.wTP967.6mg/kg、、、23.20ⅡⅢ.wFe/Al-PwTP15%21.5%～44.0%wCa-PwOPwTP80%5.Ca-P.wFe/Al-P/wCa-P0.52.wFe/Al-P/wCa-P0.56.wFe/Al-P/wCa-P.wFet/wTP46.28～108.22220wFet/wTP.wTOC/wOP200OP.10..5623.5Fig.5ThepercentageofPfractionstoTPinsedimentsofsomelakes2wFe/Al-P/wCa-PwTOC/wOPwFe/wPpHTable2TheratioofwFe/Al-P/wCa-PwTOC/wOPwFe/wPandpHinsedimentsoftheErhaiLakewFe/Al-P/wCa-PpHwFe/wPwTOC/wOP0.377.62108.22253.510.167.3346.2827.590.277.4062.09100.82573246wFe/Al-P/wCa-PFig.6ThewFe/Al-P/wCa-Pratioinsedimentsofsomelakes3.2OMFeMnPO43－FeFePO4FeOOHFe3+.OH－PO43－Fe-PAl-P.EhpHwOMwMn.FeMn、Fe2+152Fe2++MnO2+4H2O→Mn2++2FeOH3+2H+FeFe3+.7wTPwFetwMnt.HAPO43－HAPO43－OMH+PO43－.wFetwMntwTPwOMwTPwCa-PFeMnOM.wFetwMntwTPwOMwOMwOM.wFet.Fed-FeoFeo-FepFed-Feo24.Feo-FepFed-FeowTPwFeo-FepwFed-FeoFeo-Fe