241Am在砂土中的存在形式研究

采用Tessier连续提取法，研究了某地区受放射性污染砂质土壤以及未受污染土壤中人工加入示踪剂后²⁴¹Am的存在形式。结果表明，两类土壤中²⁴¹Am的存在形式差异明显，原位放射性污染土壤中的²⁴¹Am均以残渣态这种优势态存在，核素能稳定存在于土壤中；而人工加入的外源示踪²⁴¹Am在相当长的一段时间内以碳酸盐结合态为主要存在形式，与土壤结合不稳固，迁移活性高，对环境具有潜在的威胁。

Existing Form of 241Am in Sandy Soil

The Tessier sequential extraction method was employed to study the existing form of 241Am in sandy soil samples which were contaminated by radioactivity.In addition,the process was also applied to the soil into which 241Am was added purposely.The experimental results reveal that the associations of 241Am in two kinds of soils are quite different from each other.In the radioactively contaminated soil,a significant proportion of 241Am was associated with residual phase.It indicates that 241Am in the soil has rather low possibility for migration.However,the 241Am in simulant soil was mainly associated with carbonate fraction for a long time after added into the soil.It indicates that 241Am in simulant soil has high possibility for migration.