油区土壤重金属污染状况及相关性分析

Pollute Situation and Correlation Analysis of Soil Heavy Metals in Oil Field

选取陇东油区的不同开发期内受石油污染和未污染的土壤样品137个,测试Cd,Cr,Cu,Ni,Zn,Pb这6种重金属的含量及其土壤基本理化性质.采用描述性统计分析与相关分析法分析油田土壤重金属污染及其相关性.研究结果表明:该区土壤除Cd之外,其余重金属含量均在国家二级标准范围内,整个区域表现为典型的Cd污染,主要来源为农药化肥;石油在开采过程中不同程度地对油区土壤造成重金属污染,其中Cd受到的影响最大(增幅1/4).土壤中Cd,Cr和Ni三种重金属元素呈极显著相关关系,而Cd和Pb之间关系紧密,Cr和Cu,Pb和Zn的关系亦较紧密.

The 137 soil samples were collected in different period of pollution by oil and no pollution in Longdong oil field.The contents of Cd,Cr,Cu,Ni,Zn,Pb and the basic physical chemical properties of soil was monitored.Descriptive statistical analysis and correlation analysis were used to analyze the pollution and correlation of soil heavy metals pollution in oil field.Result shows that,the heavy metals content in soil of this area,except for Cd,is in range of 2nd standard of state,the whole area is a typical cadmium pollution,main source is agriculture fertilizer;Oil in the mining process may pollute soil of oil field in different degrees,Cd is mostly affected among soil heavy metals（growth rate 1/4）.Cd,Cr and Ni in soil are three heavy metals in a very significant correlation,Cd and Pb are in significant correlation,Cr and Cu, Pb and Zn have close relationships too.