摘要
为了解盐城市不同功能区地表灰尘中重金属污染特征,以工业区、交通区、居民区、商业区、学校区、公园区的地表灰尘作为研究对象,分析地表灰尘中重金属的含量分布及氮磷、有机质的含量变化,并以此为基础,对重金属的生态风险进行评价,探索重金属污染的成因与来源,为城市的地表灰尘污染防治提供理论依据。结果表明:(1)工业区地表灰尘中总氮、总磷最低;公园区和学校区地表灰尘中总氮最高,分别达到2.03、2.43g/kg,公园区地表灰尘中总磷最高,达到1.59g/kg。(2)地表灰尘中有机质呈现出和总氮、总磷一致的趋势,同样是工业区地表灰尘中有机质最低,公园区地表灰尘中有机质最高(34.0g/kg)。(3)地表灰尘中重金属和总氮、总磷、有机质总体呈现负相关关系,公园区地表灰尘中重金属最低,工业区地表灰尘中重金属最高。各个功能区地表灰尘中重金属全部高于土壤背景值。(4)地表灰尘中不同重金属元素的单因子污染指数依次为Cd>Cu>Pb;不同功能区地表灰尘中重金属综合污染指数依次为工业区>交通区>居民区>学校区>商业区>公园区,呈中污染(除公园区、商业区呈轻污染外)。
In order to make clear the characteristics of surface dust heavy metal pollution in Yancheng,this paper selected industrial zones,traffic area,residential areas,commercial areas,educational areas,city parks as the research objects to investigate the heavy metals distribution,N and P contents in different functional areas in Yancheng.Base on the research data,the ecological risk of heavy metals were assessed,the pollution reasons and resources were explored,which could provided the theoretical basis for heavy metals pollution control.The result showed that：（1） the total N and P content was lowest in industrial area,total N content was relative high in city parks （2.03 g/kg） and educational areas （2.43 g/kg）,and the highest P contents （1.59 g/kg） was found in city parks.（2） The organic carbon （OC）in surface dust shown a relatively consistent trend with total N and P content,the lowest OC was found in industrial area and the highest OC （34.0 g/kg） was found in city parks.（3） Heavy metals in surface dust presented a negative correlation with total N,P and OC,it was highest in industrial area and lowest in city parks.The heavy metals content in surface dust were higher than background value of soil.（4） The single pollution index of heavy metals in surface dust follow the order of Cd＞Cu＞Pb and the comprehensive pollution index of different functional area were in the order of industrial area＞traffic area＞residential areas＞educational areas＞commercial areas＞city parks.Most of functional areas were moderately polluted except city parks and commercial areas which were slightly polluted.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第9期7-12,17,共7页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.41301551)
江苏省"六大人才高峰项目"
盐城工学院人才引进项目(No.kjc2012022)
江苏省环境保护海涂生态与污染控制重点实验室开放课题资助项目(No.KLCW1208)
关键词
地表灰尘
重金属
功能区
surface dust
heavy metals
functional zones
