放射性核素^(60)Co在土壤中的淋溶和迁移分布  

Leaching and vertical transference of radioactive nuclide cobalt-60 in soils

作　　者：赵希岳[1,2] 樊国华[1] 蔡志强[1] 陈巧丽[1] 杨百科[1] 王寿祥[2] 

机构地区：[1]常州大学化学化工学院,江苏常州213164 [2]浙江大学原子核农业科学研究所,农业部核农学重点开放实验室,浙江杭州310029

出　　处：《中国环境科学》2010年第8期1118-1122,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(39570149);江苏省研究生培养创新工程项目(CX09S-010Z)

摘　　要：采用模拟土柱法及同位素示踪技术研究了^(60)Co在2种淹水土壤(小粉土、黄红壤)中的淋溶和垂直迁移.结果表明,淋溶后收集到的全部淋溶水中^(60)Co的含量较少,小粉土及黄红壤淋溶水中^(60)Co分别为总活度的5.61%和5.25%;滞留于土壤中的^(60)Co绝大部分分布在土壤表层0～1.0cm范围内,小粉土及黄红壤中分别有69.74%～78.63%和75.77%～86.84%的^(60)Co滞留于0～1.0cm土层范围内;土壤中^(60)Co比活度与距土壤表层深度分布呈单项指数规律.Leaching characteristics and vertical transference of radioactive nuclide cobalt-60 in two representational soils （paddy soil,yellow-red soil） were studied by using isotope-tracer techniques for soil columns simulation installation.The results showed that the specific activity of cobalt-60 in collected leaching water was low after passing through soil column. The amount of cobalt-60 in leaching water of paddy soil and yellow-red earth was 5.61%,and 5.25%.In paddy soil and yellow-red earth,69.74%～78.63%and 75.77%～86.84%radioactivity of cobalt-60 was concentrated in the 0～1.0 cm upper layer soils respectively,which illustrated that most of cobalt-60 remained in the surface soils.The specific activity of cobalt-60 in soil present was an individual exponential declining with depth of soil.

关 键 词：~60Co 淋溶 迁移与分布 放射生态学 

分 类 号：X591[环境科学与工程—环境工程] X131.3