底泥中酸性挥发硫及同步浸提金属的测定

(,100085)...90%.0102mol/g().;;;.1(AcidVolatileSulfide)(SimultaneouslyExtractedMetals).H2S;.,,,.,S2-.S2-,CuSPbSZnSFeS,[1].Eh,S2-SO2-4,,,;Eh,SO2-4S2-,,,.,.,SEM/AVS1,,,[2,3]..H2S,NaOH,NaOHH2S[4].,S2-SO2-4,,.,H2SNaOH,.,,,,.22111%:510g,50mL,,17319977ACTASCIENTIAECIRCUMSTANTIAEVol.17,No.3July,1997500mL,115g113g.()(,,1989).1(1)(2)(3)500mL,1%(4)500mL,(5)500mL,(6)(7)(8)200mL,80mL015mol/LNaOHFig11ApparatusforAVSdetermination1.,,..,,,.212()()().,,,.,,8cm3,.21390mL,80mL015mol/LNaOH,N210min,150cm3/min,100cm3/min.10mL.,520g,,.,100cm3/min10min.,.,.,30mL20mL6mol/LHC1,.HC130min.,100cm3/min40min.,10mL012%2mL0125mol/L,100mL,,,.30min,670nm721.0145m,ICP,SEM.2147100mL,75mL015mol/LNaOH.110021003100410051006100mLS2-10g/mL100mL.10mL012%2mL0125mol/L,,30min670nm721.(:017,,.):(g)=/(1-%),%=(-)/100%,45317(mol/g)=(g/mL)10032106/,SEM(mol/g)=(C/M)V/G(CuPbZn),C:(mg/L),M:,G:(g),V:(L),32106:.3311N2NaOH.,,S2-;,NaOHH2S.30min,6mol/L,10mL5mL1010g/mL,20cm3/min140cm3/minN2,N2S2-,2.2N2Fig12TherecoveryofsulfidewithdifferentN2flows2,N285120cm3/min,S2-85%.,S2-.100cm3/min,S2-92%,100cm3/min.31240min.Na2S,S2-.,,S2-H2S,S2-;,S2-.100cm3/minN2,20mL6mol/L5mL1010g/mLNa2S,1060min,S2-.3.3,3050min,S2-90%;,S2-.40min.313S2-40min,N2100cm3/min,6mol/L,1010g/mLNa2S,S2-.(4):3Fig13Therecoveryofsulfidewithdifferentreactiontimes4Fig14Therecoveryofsulfidewithdifferentsulfideamounts5533:10120g,S2-,S2-10g,58%;40g90%.Na2S,,,.S2-Na2SS2-,.0102mol(S2-)/g(615g/g)(10g)50%,0102mol(S2-)/g.314H2S,.,,,.KspCuSHgSPbSCdSNiSZnSCoSFeSMnS.CornwellandMorse,16mol/LFeS,FeS2[5].Allen,1mol/LPbSCdS,CuSHgSFeS2[3].DiToro,,,,Cd2+FeSFe2+,CdS[2].,CuSHgSFeS2,,1mol/L.1mol/L.100cm3/min,40min,234567mol/L20mL,013401510168018511031118mol/L,AVSSEM,.,CuPbZnMn,50%,16g.5.5Fig15TheeffectofacidityonsedimenttheAVSandSEMdetermination5,AVSSEM.1mol/LAVS015mol/L3120134mol/L8170185mol/L11965317.1mol/L,AVS,1mol/L.1mol/L.,CuPbZnFeMnAVS,CuPbZnFeMn,AVS.015mol/L,,CuPbZn,FeMnAVS,S2-FeSMnS.AVS,01113mol/g,,FeMn,FeSMnS.CuPbZnFeMn,.1mol/L,AVS,.S2-,,SEM-AVS,SEM/AVS1.SEM/AVS1,,,.,1mol/L,SEM(Cu+Pb+Zn)/AVS5316,1,.,,,,.315N2100cm3/min,40min,6mol/L,,3AVSSEM.13AVSSEMTable1ThecontentofAVSandSEMinsedimentsfromDanjiangkou,GukouandCaijiawanAVS,mol/g()SEM,mol/g()CuPbZnSEM/AVSCV(n=4)0148130110860103760117180166615%01046861329001082111146416114117%0114884172960114543175105719414%1,SEM/AVS,1,,161145719,1,,.,,,(S2-SO2-4S)501190471156184mol/g()[6],,AVS,.S2-CuSFeS2,1mol/L,AVS.,CuSCuFeS2FeS2,.,,4213381640138mol/g()[6],AVSCu,S2-CuS.,S2-,.7533:4.1mol/LAVS,SEM,SEM/AVS1.,N2100cm3/min,40min,6mol/L,40g,,90%.0102mol/g().6mol/L,1mol/L,AVSSEM.1JenneEA.In:ChappelWK,PetersonK(eds.).Traceelementsorptionbysedimentsandsoil2sitesandprocess.SymposiumonMolybdenumintheEnvi,NewYork:Dekker,1977:4255532DiToroDMetal.Acidvolatilesulfidepredictstheacuteboxicityofcadmiumandnickelinsediments.EnvSciTechnol,1992,26:911013AnklyGTetal.Predictionofbioaccumulationofmetalsfromcontaminatedsedimentsbytheoligochatte,LumbriculusVariega2tus.WaterResearch,1994,28(5):107110764AllenHEetal.AnalysisofAVSandSEMfortheestimationofpotentialtoxicityinaquaticsediments.EnvironmentalToxicolo2gyandChemistry,1993,12:14414535CornwellJC,MorseJW.Thecharacterizationofironsuflidemineralsinanoxicmarinesediments.MarChem,1987,22:19320661[]..19951995211213DETERMINATIONOFACIDVOLATILESULFIDEANDSIMULTA2NEOUSLYEXTRACTEDMETALSINSEDIMENTLinYuhuan,GuoMinxin,ZhuangYan(TheResearchCenterforEco2EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085)ABSTRACTAmethodforanalyzingAVSandSEMinsedimentwasdeveloped.Optimumcondi2tions,includinggasflow,reactiontime,acidityandsulfideamountarediscussed.TherecoveryofAVSismorethan90%andthelimitofdeterminationis0102mol/gdrysediment.Keywordssediment,AVS,SEM,measurement.85317