地积累指数法在土壤重金属污染评价中的应用

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1、地积累指数法在土壤重金属污染评价中的应用摘要:应用地积累指数对广州5个郊区的土壤重金属污染情况进行了评价研究.从广东省土壤重金属背景值计算的地积累指数结果来看,广州郊区土壤中Hg和Cd都达到中度污染,Zn为轻度-中度污染,Pb,As,Cu,Cr,Ni都不存在污染.从8种元素的分级频率来看,Hg的污染频率最大,达到89.8%;其次是Cd和Zn,分别是78.2%和54.6%;其余5种元素污染频率的大小顺序为Pb,As,Cu,Cr,Ni;Hg出现了5.9%的极严重污染.广州5个郊区的污染元素和元素的污染程度存在着明显的差别,Q型聚类分析将海珠区、芳村区、天河区和黄埔区

2、聚为一类,为较高程度污染区;而把白云区单列一类,为低污染区;同时,整个广州的污染情况与白云区聚为同一类.关键词:土壤重金属;污染评价;地积累指数;广州中图分类号:X53　　　　　　文献标识码:A　　　　　　文章编号:0253-374X(2006)12-1657-05ApplicationofIndexofGeoaccumulation(Igeo)toPollutionEvaluationofHeavyMetalsinSoilCHAIShiwei1,2,WENYanmao2,ZHANGYalei1,ZHAOJianfu3(1.StateKeyLaboratoryo

3、fPollutionControlandResourcesReuse,TongjiUniversity,Shanghai200092,China;2.SchoolofEnvironmentalScienceandEngineering,ZhongshanUniversity,Guangzhou510275,China;3.KeyLaboratoryofYangtzeRiverWaterEnvironmentoftheMinistryofEducation,TongjiUniversity,Shanghai200092,China)Abstract:Polluti

4、onofheavymetalsinsoilinGuangzhousuburbsisevaluatedonthebasisoftheindexofgeoaccumulation.TheresultsshowthatthepollutionofHgandCdinthesoilofthesuburbsofGuangzhouCityisclassifiedasmoderatedegree,andthatofZnasbetweenslightandmoderatede2grees,andfiveothermetalsofnopollutionaccordingtother

5、esultsofIgeobasedonthebackgroundval2ueofheavymetalsinthesoilofGuangdongProvince.ThepollutionfrequencyofHgis89.8%,thehighestamongthe8metals,andthoseofCdandZnare78.2%and54.6%respectively,nexttothehighest,andthepollutiondegreeoftheotherfivemetalscanbeputinthisorder:Pb,As,Cu,Cr,Ni,ofwhic

6、hPbisthehighestandNiisthelowest.Hgcausesveryseriouspollution,foritreaches5.9%.Therearequitedifferentpollutingmetalsandpollutingdegreesinthe5suburbsofGuangzhouCity.Haizhu,Fangcun,TianheandHuangpuaregroupedintothesamedegree,whicharetheheavilypol2lutedareas.Baiyunisalessheavilypolluteda

7、rea,thesameasGuangzhouCity.Keywords:heavymetalinsoil;pollutionevaluation;indexofgeoaccumulation;Guangzhoucity第34卷第12期2006年12月同济大学学报(自然科学版)JOURNALOFTONGJIUNIVERSITY(NATURALSCIENCE)Vol.34No.12　Dec.2006　　Muller[1]曾提出用地积累指数定量评价沉积物中的重金属污染程度,并定了相应的污染程度级别划分标准(表1).这种评价方法也可用来评价土壤中重金属的污染程度及其分级

8、情况[2,3].广州市郊