摘要
以延长油田西区采油厂原油污染土壤为研究对象,选取有代表性的6个丛式井场,采集深度为0～10、10～20、20～30cm 3个土层的土壤样品,同时设非污染对照点.重点分析了原油污染土壤中Hg、As、Cd、Pb、Zn、Cu、Cr共7种重金属的含量及其在不同土层的分布状况,重金属含量与相应土壤理化性质的关系.结果表明,油区土壤石油污染为点污染,采样点1、3、4、6土样的石油烃质量浓度在1 111.67～2 799.00 mg/kg,达重度污染.虽然各土样中7种重金属均未超过《土壤环境质量标准》（GB 15618-1995）的二级标准限值,然而单因子富集指数表明,Hg、Cd、Pb、Zn、Cu均有不同程度的富集.原油污染显著改变土壤性质,土壤石油烃含量与总有机碳、速效氮极显著相关,与土壤电导率、Zn含量、Cu含量显著相关.本研究完善了陕北原油污染土壤中重金属含量及分布状况资料,为污染环境的生物修复提供了基础信息.
This paper aims to study the content and distribution of heavy metals in the polluted soil caused by crude oil in the hilly area of the loess plateau in Northern Shaanxi,China. Contaminated soil samples in three different soil layers （0-10,10-20,20-30 cm） were collected from six representative sites in Xiqu oil production plant of Yan- chang Oilfield Corp. ,Ltd. ,and the soil samples as collected from the uncontaminated area were used as the control group. Concentrations of Hg, As, Cd, Pb, Zn, Cu and Cr were examined, and the determination of petroleum hydrocar- bon, five soil factors and soil enzymes were performed as well, respectively. The results show that the contents of pe- troleum hydrocarbon from soil samples of site 1,3,4,6 were ranged from 1 111.67 mg/kg to 2 799.00 mg/kg,which were significantly higher than those of the uncontaminated areas. The contents of seven heavy metals were all within the bounds of the second grade of environmental quality standard for soil （GB 15618-1995）. However, contents of H g, Cd,Pb, Zn,Cu were significantly higher than the contrast. The content of petroleum hydrocarbon was significantly and positively correlated with TOC,available P, N and soil conductivity. There was an obviously positive correlation be- tween the Zn,Cu content and contents of petroleum hydrocarbon. This paper provided basic information for the bio-re- mediation of oil polluted soil.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2014年第3期20-25,共6页
Environmental Pollution & Control
基金
陕西省自然科学基金资助项目(No.2010JQ5007)
陕西省教育厅科研项目(No.2010JK920)
延安大学校内基金资助项目(No.YD2009-03)
国家级大学生创新项目(No.201307123)
关键词
陕北
原油污染土壤
重金属含量及分布
Northern Shaanxi
petroleum polluted soil
content and distribution of heavy metals
