重庆都市经济圈土壤Cd元素含量分布特征与评价  

Distribution Characteristics and Assessment of Cd Contents in the Chongqing Metropolitan Economic Zone

作　　者：严明书 张茂忠 唐将 杨振鸿 贾仲民 

机构地区：[1]重庆市地质矿产勘查开发局川东南地质大队,重庆400038 [2]重庆市地质矿产勘查开发局107地质大队,重庆401120

出　　处：《西南大学学报（自然科学版）》2011年第11期118-124,共7页Journal of Southwest University(Natural Science Edition)

基　　金：全国土壤现状调查及污染防治项目编码(GZTR20050101)

摘　　要：通过重庆都市经济圈网格化深浅层土壤及评价样品的调查分析,阐述重金属Cd区域上的分布现状,并绘制土壤Cd元素环境质量分级图.研究区浅层土壤Cd背景平均值0.27μg/g,深层0.13μg/g.根据《土壤环境质量标准》对区内土壤进行统计分类,区内浅层土壤Cd元素Ⅱ类土及以上土类面积为83.97%.土壤Cd高含量值主要分布在金刀峡镇北、含谷—白市驿、木耳—王家和玉峰山镇等区域.含谷—白市驿、木耳—王家、西彭北等区域的高Cd含量受人类活动影响比较明显,其中含谷—白市驿区Cd主要来源于生活垃圾、排污底泥和降尘,而金刀峡镇北的高Cd含量属自然背景变化的范畴.Investigation and analysis of gridding soil samples in surface and deep layers are made in the Chongqing Metropolitan Economic Zone,regional distribution of the heavy metal Cd is described in the research areas,and a classification map of the Cd-related environmental quality is plotted.The average content of Cd is 0.27 μg/g in the surface soil and 0.13 μg/g in the deep soil.The acreage of soil including class II and above accounts for 83.97% of the total,according to Standard of Soil Environmental Quality of China.The high Cd content values are distributed mainly in the areas of the north of Jindao Gorge town,Hangu-Baishiyi,Mu＇er-Wangjia and Mount Yufeng.The high Cd contents in areas like Hangu-Baishiyi,Mu＇er-Wangjia and the north of Xipeng result mainly from human activities.The primary sources of Cd in Hangu-Baishiyi are believed to be domestic waste,substrate sludge and dustfall.In contrast,the high Cd content in the areas of the north of Jindao Gorge town may well originate from the changes of the natural background.

关 键 词：土壤 重金属元素 环境质量 污染评价 自然背景 

分 类 号：X53[环境科学与工程—环境工程]