摘要
为研究某焦化厂周边土壤中重金属（Pb,Cd,Zn,Cu,Cr和Mn）的生态风险,对焦化厂东、西、南和北方向上的500,1 000和3 000m处表层土壤进行了采样。采用单因子质量指数法、地累积指数法以及潜在生态危害指数法对各样点土样中重金属的生态风险进行了评价。结果表明,所有采样点中Cd含量是土壤环境质量标准（GB15618—1995）Ⅱ级标准中Cd标准值的2.1~7.2倍,其他重金属含量均未超过其标准值,各重金属元素含量均在1 000m处达到最大值;研究区域土壤中各种重金属元素的污染程度由强至弱依次为：Cd〉Cr〉Cu≈Zn〉Pb≈Mn,潜在生态危害由强至弱依次为：Cd〉〉Pb〉Cu〉Cr〉Zn〉Mn,北部〉西部〉东北〉南部;焦化厂周边土壤整体存在严重的潜在生态风险,特别是焦化厂北面土壤中重金属的潜在生态风险为极严重,其中Cd在土壤中存在严重的累积效应,是造成潜在生态风险的主导因子。
The surface soil at the 500, 1 000 and 3 000 m in the east, west, south and north of coking plants were sampled and three methods （single factor index, geo-accumulation index and Hakanson potential ecological risk index） were adopted to assess the potential ecological risk of heavy metals（Pb, Cd, Zn, Cu, Cr and Mn） near coking plant in Taiyuan City. Results showed that the concentration of Cd in all soil sam- pies was 2.1~2.7 times of the standard value（ Ⅱ ） of environmental quality standard（GB15618-1995） for soil, the concentration of the other heavy metals did not exceed the standard values（ Ⅱ ） and the concentra- tion of six heavy metals was maximum at 1 000 m; The relative degree of pollution was in the order of Cd〉 Cr〉Cu≈Zn〉Pb≈Mn; Likewise, the potential ecological risk was characterized by the order of Cd〉〉Pb〉 Cu〉Cr〉Zn〉Mn and north〉west〉east〉south, and the soil in the research area possessed serious poten- tial ecological risk, specially the potential ecological risk of heavy metals in the north of the coking plant was very serious, in which, Cd was dominant contributors for ecological risk, for it accumulated markedly in soil around the coking plant.
出处
《水土保持通报》
CSCD
北大核心
2014年第6期288-292,共5页
Bulletin of Soil and Water Conservation
基金
山西省基础研究计划项目"天然高分子改性絮凝剂的合成及其对焦化废水的絮凝性能研究"(2008011020)
关键词
焦化厂
重金属
生态风险评价
coking plant
heavy metals
ecological risk assessment
