天津北部土壤As的地球化学特征及污染程度  

Geochemical characteristics and pollution extent of arsenic in soils in the northern part of Tianjin Municipality,China

作　　者：武俊宇[1] 曾荣树[1] 任天祥[2] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《地质通报》2007年第11期1486-1493,共8页Geological Bulletin of China

基　　金：国家自然科学基金项目<天津市土壤农业环境地球化学调查>(编号:40272127)的部分成果

摘　　要：根据采样深度不同把采样环境分为两大类:第Ⅰ环境和第Ⅱ环境。通过对研究区第Ⅰ环境土壤样品As的统计分析,得出As在第Ⅰ环境土壤中的统计特征值服从正态分布,元素的均值与全国土壤或天津市土壤均值非常接近。对第Ⅰ环境和第Ⅱ环境土壤重金属元素的空间变化特征进行了对比研究,结果表明,第Ⅱ环境土壤As的含量数值与第Ⅰ环境差异不大,第Ⅱ环境土壤重金属元素继承了第Ⅰ环境土壤的含量特征,在城镇附近和有污水灌溉的武清县、宝坻县、于桥水库附近As的污染比较严重。对研究区第Ⅱ环境土壤重金属元素的污染程度评价使用了地球化学方法和生物法2种方法进行对比研究。结果表明,As对天津市北部的污染程度并不严重。Based on the sampling depths, two environments of soil sampling may be distinguished： environment I and environment II. The results of statistical analysis of As in soil samples from environment I indicate that the statistical characteristic values of As obey the normal distribution and that the mean value of As is very close to that of the country and Tianjin Municipality. Comparative study of the characteristics of spatial changes in heavy metals of soils of environment I and environment II shows that there is little difference between the As content in soils of environment I and that in environment II and that the heavy metals in soils of environment II inherit the features of the heavy metal contents of environment I. Relatively serious As pollution occurs near the city, in Wuqing and Baodi counties where farmland is irrigated by sewage and near the Yuqiao reservoir. The geochemical method and biological method were used to evaluate the pollution extent of soil heavy metals in environment II of the study area. The results indicate that As pollution in the northern part of Tianjin Municipality is not serious.

关 键 词：土壤 地球化学特征 AS 污染程度评价 天津市北部 

分 类 号：S151.93[农业科学—土壤学] X53[农业科学—农业基础科学]