【摘要】 通过对不同深度土壤中Hg和As含量的测试、污染状况的分析与调查,了解Hg和As元素在不同深度土壤中的累积层位、垂直迁移过程,进而探索Hg和As元素的转移可能对环境造成的潜在危害(即形成“化学定时炸弹”的可能性)。对北京东南郊南苑土壤钻孔剖面研究发现,在深度为13.66-16.00m之间的土壤层,pH剧烈变化,As元素含量明显增高,初步判断该层位是污染物的主要累积层位。更多还原

【Abstract】 Based on the contents and distribution of Hg and As elements in the columnar profile of soil in Beijing area, this paper discusses the migration characters, mechanism of accumulation and dissipation in lengthways, and prohes the potential danger that the migration of Hg and As elements may cause to the environment, i. e. forming the possibility of" chemical time bomb". After surveying the soil borehole in Nanyuan, we found that pH value changed acutely and contents of heavy metals increased drastically in the soil stratum from 13. 66 to 16. 00 meters depth, which is deduced as the major accumulation stratum of contamination.更多还原