洱海表层沉积物吸附磷特征

2411201111ResearchofEnvironmentalSciencesVol．24N[e-mail]．*[e-mail]1122*221．3300312．100012．①2．0～0.5h0.5～5h5h．②Qmax904.60～1420.34mgkgMBC477.33～2300.95LkgEPC0－0.015～0.068mgL．③QmaxVmaxEPC0．④VmaxQmaxEPC0．．X52A1001－6929201111－1242－07PhosphateAdsorptionCharacteristicsontheSurfaceSedimentsofErhaiLakeHEZong-jian1LIUWen-bin12WANGSheng-rui2JIAOLi-xin2ZHAOHai-chao21．CollegeofEnvironmentalandChemicalEngineeringNanchangUniversityNanchang330031China2．StateEnvironmentalProtectionKeyLaboratoryforLakePollutionControlResearchCenterforLakeEco-environmentChineseResearchAcademyofEnvironmentSciencesBeijing100012ChinaAbstractAdsorptionkineticsandisothermsofphosphateonthesurfacesedimentsfromErhaiLakeweredeterminedthroughbatchexperimentsandtheeffectoftotalorganicmatterTOMandtotalcalciumcontentinthesedimentsonthephosphateadsorptionparameterswerediscussed．Theresultsindicatedthat1TheprocessofphosphateadsorptionkineticsofthesurfacesedimentsfromErhaiLakewasdividedintotherapidadsorptionstageandtheslowadsorptionstagewhichmainlyoccurredinthefirst0.5handfrom0.5-5hrespectively．Thephosphateadsorptionofallthesedimentsreachedequilibriumwithin5h．2QmaxThephosphatemaximumadsorptioncapacity904.60-1420.34mgkgandMBCmaximumbuffercapacity477.33-2300.95LkgofthesedimentsindifferentsitesofthewestbankweresignificantlyhigherthanthoseintheeastbankalthoughEPC0adsorption-desorptionequilibriumconcentrations0.015-0.068mgLindifferentsitesshowedtheoppositetrend．3ThetotalcalciumandtotalorganicmattercontentsofthesedimentsweresignificantlypositivelycorrelatedwithQmaxandVmaxmaximumadsorptionratebutweresignificantlynegativelycorrelatedwithEPC0.4ThephosphateadsorptionparametersQmaxandVmaxofthesurfacesedimentsfromErhaiLakeweresignificantlyhigherwhileEPC0waslowerthanthecorrespondingparametersoftheshallowlakesinthemiddleandlowerreachesoftheYangtzeRivercatchment．ThereforethehighcontentsoftotalcalciumandtotalorganicmatterinthesedimentsmightaccountforhighriskbutlowamountofphosphatereleaseinthesedimentsofErhaiLake．KeywordsErhaiLakesedimentsphosphateadsorptionadsorptionrateadsorptioncapacityDOI10.13198/j.res.2011.11.43.hezj.015111-3．TOMFeAlCaCO34-5．5-6Feo+Alo．SANYAL7．CaCO3．WANG8．EPC0－－910．EPC0－11．Ⅱ～ⅢwTP964.6mgkg12．、．．1100°05'～100°17'25°36'～25°58'1974m．2565km242.0km8.4km．1974.0m249.8km210.5m20.9m1025.6×108m32.75a13-14．、、．、．、12．．．22.1102009510cm1．．1．wTPwTNwTOM684.50～1108.34mgkg2066.20～6515.27mgkg2.57%～15.56%．1Fig．1LocationoftensamplingsitesinErhaiLake2.20.5g1mgLKH2PO450mL25±1℃200rmin5102030min1.53591224h5000rmin15min．．．23421241Table1PhysicalandchemicalcharacteristicsofthesedimentsamplesinErhaiLakewTPmgkgwTNmgkgwTOM%EhVpHE11108.342084.372.84－297.207.81E2914.956344.4514.29－360.807.21E31011.332223.193.11－218.707.54E4756.456515.2715.56－274.707.52E5926.802066.202.57－288.607.52E61009.402305.043.11－209.107.39E71055.402224.163.08－221.507.46E8698.543156.985.17－455.607.85E9745.625062.787.58－216.207.46E10684.504276.267.58－165.106.930～15mgL00.050.10.20.5125815mgL0～0.20mgL00.010.020.050.080.100.150.20mgL．0.5g100mL50mLKH2PO425℃24h5000rmin15min．．wTOMwTPSMT．33.12．2．0～0.5h0.5～5h．5h15．2Fig．2PhosphateadsorptionkineticsonthesurfacesedimentsfromErhaiLake2.Vmax〔470.76～850.54mgkg·h〕0～5min2Table2TheadsorptionratesofphosphateonthesurfacesedimentsfromErhailakeatdifferentsamplingintervalsmgkg·hh0.50.50.51.53612E1129.306.527.432.650.850.430.12E2169.864.891.080.720.310.330.07E3132.936.973.651.910.570.750.20E4178.132.641.580.620.310.250.07E5121.933.474.333.961.411.450.37E6117.549.927.332.820.770.790.24E7124.738.414.613.341.070.540.12E8125.598.334.223.311.170.920.12E9124.7511.206.212.250.680.580.19E10119.869.154.923.090.850.730.14442111．E2E4Vmax5h12h．E2E4．E2E420cmwTOM．wTOM816．3.23LangmuirR20.96.Q=QmaxKC1+KC1QmgkgQmaxmgkgCmgLKLmgQmaxKMBCLkg．3Fig．3ModeldescriptionsofadsorptionisothermsforphosphateadsorptiononthesedimentsfromErhaiLake3．3QmaxMBC904.60～1420.34mgkg477.33～2300.95LkgE2E1E3．．、．．WANG17．3Table3IsothermparametersofphosphateadsorptiononthesedimentsfromErhaiLakeE1E2E3E4E5E6E7E8E9E10Qmaxmgkg904.601420.34966.241141.81927.08960.161088.081136.961051.621108.16KLmg0.601.620.490.751.140.940.490.990.900.58MBCLkg541.862300.95477.33852.931059.65903.51530.981123.31942.26642.73n=11.3.3－－18．Q=mC－NAP2NAPmgkgm19Lkg．EPC0=NAPmEPC0020．44．4NAP13.26～46.00mgkg26.57mgkgEPC00.015～0.068mgL0.041mgL．542124VQmaxNAPEPC0．WANG17．E2wTOMNAPEPC0.5wTOMwFig．5CorrelationoftheTOMandtotalCawiththephosphateadsorptionparametersofthesedimentsfromErhaiLake4Fig．4Phosphateadsorption-desorptionisothermsofthesedimentsfromErhaiLake3.4wTOMw5．54Table4PhosphateadsorptionisothermsandparametersofthesedimentsfromErhaiLakeEPC0NAPmR2E10.05726.25462.350.973＊＊E20.02323.951061.920.970＊＊E30.06842.39626.770.955＊＊E40.01513.26892.580.983＊＊E50.03914.92385.030.985＊＊E60.04621.15458.190.973＊＊E70.06235.37566.550.948＊＊E80.02915.69541.970.966＊＊E90.02526.751077.060.961＊＊E100.04546.001029.190.976＊＊＊＊P＜0.01．wTOMwP＜0.01n=8．wTOMVmaxQmaxR2=0.7787P＜0.01R2=0