摘要
测定了珠江三角洲经济区顺德典型肝癌发病区的29个表层土壤样品重金属含量,并用平均富集因子（AEFs）分析了研究区重金属元素污染程度,结果表明表层土壤重金属按富集程度可分为3类,严重富集（AEFs〉5）,主要有Cd、Hg;中度富集（AEFs=2~5）,包括Zn、Cu、Ni、As、Co、Mn;轻微富集（AEFs〈2）,包括Fe、Cr、Pb、Se;Mo的富集程度最低,29个样点的EF值均小于0.2。进一步通过因子分析和聚类分析研究表层土壤中重金属的类别和来源,发现表层土壤中的17种重金属主要有5种不同组合,反映了5种不同的来源或迁移特性：因子1包括Ni、Li、V、Co、Cr、Fe和Al,因子2包括OM、Se和Ce,因子3主要包括Pb和Zn,因子4包括Cd、As和Mn,因子5由pH、Mo和Hg组成,其中因子1、2、4代表3种不同特性的自然源因子,因子3为交通及工业污染源因子,因子5为燃煤污染源因子。以广东省土壤背景值为参比标准进行的潜在生态危害评价结果表明,研究区表层土壤重金属潜在生态危害指数较高,总体以强度为主（RI〉300）,其中单项生态危害系数较高的是Hg和Cd,其余6种金属元素Pb、Cu、Ni、As、Cr属于轻微生态危害性。
Shunde district of foshan is one of the four endemic areas with the highest cancer incidence,and the incidence of liver cancer and mortality rate are increasing year by year.Concentrations of heavy metals and the soil physic-chemical property of 29 topsoil samples from high cancer incidence area were determined.The Enrichment factors were used to evaluate the extent of metal enrichment-contamination.Results showed that heavy metal enrichment in study area could be divided into three groups： certain to severe enrichment（AEFs5）,Cd（AEF=8.35）and Hg（AEF=5.31）being included in this group;moderate enrichment（AEFs=2~5）,which is the case of Zn（AEF=3.57）,Cu（AEF=2.43）,Ni（AEF=2.29）,As（AEF=2.26）,Co（AEF=2.15） and Mn（AEF=2.19）;negligible to low enrichment（AEFs2）,which is the case of Fe（AEF=1.73）,Cr（AEF=1.27）,Pb（AEF=1.26）,Se（AEF=1.15） and Mo（AEF=0.13）,especially the EF for Mo that was an anti-carcinogenic element in each sample was lower than 0.2.Factor analysis（FA） and cluster analysis（CA） were applied to estimate the sources and categories of heavy metal elements.Results showed that there were five different principal factors of the seventeen heavy metals which reflected five different sources and migrate characteristic：F1 consists of Ni,Li,V,Co,Cr,Fe and Al,F2 includes Se,Ce and OM,F3 includes Pb and Zn,F4 includes Cd,As and Mn,F5 includes Hg,Mo and pH.F1,F2 and F4 were predominantly derived from three kind natural sources which maybe had different attributes.F3 was a result of the influence of industries and transportation;F5 mainly from the pollution of coal burning.Results of assessment of potential ecological risk based on the soil backguround of Guangdong Province showed the ecological hazard to soil pollution with heavy metals was extraordinarily serious which the ecological hazard level of 93.1% samples exceeds serious risk level（RI 300）.And the single ecological risk of Hg and Cd were the highest that all of the samples exceed serious risk level,the other metal included Pb,Cu,Ni,As and Cr were light level of ecological hazard.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第2期471-476,共6页
Chinese Journal of Soil Science
基金
广东省珠江三角洲经济区农业地质与生态地球化学调查项目(1212010511216)资助
关键词
重金属
富集特征
生态风险
肝癌高发区
顺德
Heavy metals
Enrichment level
Ecological risk
High liver-cancer incidence area
Shunde district of Foshan city
