典型污染场地中滴滴涕浓度空间变异性研究  

Spatial variability of DDT in a typical contaminated site

作　　者：刘敏[1] 马运[2] 

机构地区：[1]重庆市环境科学研究院,重庆401147 [2]中国环境科学研究院,北京100012

出　　处：《环境污染与防治》2010年第11期12-17,共6页Environmental Pollution & Control

基　　金：国家科技支撑计划项目(No.2007BAC16B03;No.2006BAC02A19)

摘　　要：利用经典统计学和地统计学相结合的方法,以某滴滴涕(DDT)粉剂生产企业为例,对污染场地中表层和地下5m处土样DDT浓度的空间变异性进行了研究。结果表明:表层和地下5m处土样DDT浓度经过对数转化后均通过了柯尔莫哥洛夫-斯蜜诺夫检验(K-S检验),能够很好地服从正态分布;表层和地下5m处土样DDT浓度的半变异函数拟合符合高斯模型,决定系数分别为0.8973和0.9348,由空间自相关引起的空间变异性分别占系统总变异性的99.11%和83.12%;用克里格插值法制出的DDT浓度等值线图能直观地反映表层和地下5m处土样DDT浓度的空间分布特征,DDT浓度呈现以原粉生产车间为中心向四周扩散的趋势,地下5m处土样DDT浓度空间分布与表层基本一致。The surface soil and 5 m depth underground soil were collected from 26 sampling sites of a DDT manufacture enterprise. The spatial variability of DDT in the typical contaminated site was analyzed by using classical statistics and geostatistics method. The results showed that the concentrations of DDT after logarithmic transformation obey the law of normal distribution. The semivariogram of DDT concentration in surface soil and 5 m depth underground soil were well described by Gaussian model,with the fitting coefficient were 0.897 3 and 0.934 8 respectively. Spatial heterogeneity aroused from spatial autocorrelation in the surface and underground soil were 99.11% and 83.12%. The isoline map of DDT concentration in two layers of soil was drew by Kriging interpolation method. The isoline map showed that the concentration of DDT residues diffused from the workshop to around,and the spatial distribution of DDT in underground soil was basically consistent with that in surface soil.

关 键 词：滴滴涕 污染场地 土壤 空间分布 空间变异性 地统计学 

分 类 号：X53[环境科学与工程—环境工程]