摘要
以天津近郊西青区主要农产品生产基地农田表层土壤(0～20cm)作为调查对象,分析了土壤中重金属As、Hg、Zn、Pb、Cu、Cr和Cd的含量,通过数据统计分析,各项重金属平均含量均低于《土壤环境质量标准》(GB 15618—1995)二级标准,但高于天津土壤背景值和全国土壤背景值,Cd、Cu、Hg在个别点位出现超标现象。多数点位土壤内梅罗综合污染指数处于清洁水平。潜在生态风险评价表明,各点位土壤重金属潜在生态风险指数(RI)为12.96～104.49,均处于轻微生态风险水平。
The contents of soil heavy metals,such as As,Hg,Zn,Pb,Cu,Cr and Cd,in surface soil（0~20cm） from the main agricultural production farmland-Tianjin suburb Xiqing District,were investigated.Statistical analyses indicated that the mean contents of all metals are lower than their environmental quality secondary standard values for soils（GB 15618—1995）,whereas exceeded that of their regional background values soil and the national soil.The contents of Cd,Cu,Hg in some soil samples have exceeded their soil secondary standardValues.Nemerow pollution index indicated that the level of most soil samples is at a clean level.The potential ecological risk index（RI） ranged from 12.96 to 104.5,indicating a low ecological risk level.
出处
《中国环境监测》
CAS
CSCD
北大核心
2012年第3期23-27,共5页
Environmental Monitoring in China
关键词
天津近郊
农田土壤
重金属
生态风险
Tianjin suburb
Soil
Heavy metals
Ecological risk assessment
