城市污染河道浮游生物与底栖动物变异多元分析.pdfVIP

2012 1777 reference 1【9】．Porewaterwerepre— pollutedriverflowingthroughcityand sumtogetecologicalriskindex(RI)， paredbycentrifugationmethod，NH3- industriaIarea．Accordingto previous and RIisadoptedasthe evaluation N ofporewaterwas determined by suweyofpollution fTable1andTable basis ．AsshowninTable3，Rlvalue Nessler’sreagentspectrophotometric 2)，themainpollutionfactorisheavy ofthe restsampling stationsalready method(GB7479·87)；COD口ofjnter- melaI．Jnordertoeffectivelyreflectthe exceeded600 exceptA1。so itseco— stitia1 water was determined by ecologicalrisk．a totalof10pollution logicalriskhadreachedgreatdegree； dichromate method (GB11914—89)． indexeswith greatimpactonaquatic． viewedfr0m avarietyofheavymetals． The sedimentsamples were dried， Pb，Cd，Hg，Cr，As，Cu，Ni，Znofsedi— Hgand Cdshowedthelargestharm ground into powder，and passed by ment，NH3-N andCODcrofporewater， degree。RIofHg in various stations 100meshsieve．About0．5gpowder wereselectedasparameterstochar- wasgreaterthan320exceptA1．be- wasfakentodeterminethecontentof acterizeecologicaIrisk，andHakanson longingtoextremelystrongecological heavy metaIaccording to reference potentialecologicalriskindexmethod harm．Thisresultwasconsistentwith 2『0]． wasused to evaluate．Hakanson po- the actuaIobservation．Viewed frOm Dataanalysis tentiaIecologicaIriskindexmethodnot fieldsituation。thewaterinmostrivers Shannon-W iener diversity ind- of Foshan watewray generally has onlycan reflectthe ecologicaleffects ex 1【5-16] ． clusteranalysisofmultivariate ofvarious heaw metals in the re- black smelly phenomenon， aquatic statisticaJanalysis and MDS analy- species are scarce