放射性锆在红壤中的淋溶特性研究

A study on the leaching characteristics of zirconium-95 in soils

采用模拟土柱法研究了放射性锆 (95 Zr)在两种红壤 (泮畈红壤和红黄壤 )中的淋溶特性和垂直迁移。结果显示 :1)淋溶收集水中95 Zr的含量甚微 ,接近于 0 ,且随着总淋溶水量的增加 (2 5 0～ 75 0ml ) ,淋溶水中95 Zr的总量几乎没有变化 ,表明95 Zr一旦被土壤吸附 ,则不易被水流解吸 ;(2 )滞留于土壤中的95 Zr绝大部分分布在土壤表层 ,泮畈红壤和红黄壤分别有90 .0 5 %～ 97.47%和 96 .0 2 %～ 97.16 %的95 Zr滞留于 0～ 0 .4cm土层范围内 ,表明二种红壤对95 Zr均有较强的吸附能力 ;比较其变化动态 ,红黄壤对95

The leaching characteristics and vertical transport of zirconium 95 in two representational soils (panfan red soil and red yellow earth) in Zhejiang province were studied with soil pole simulation installation. The results showed: (1) The content of Zirconium 95 in collective water was very low and near to 0. Meanwhile with increasing the total amount of leaching water(250～750ml), the gross of zirconium 95 in leaching water changed indistinctively, which indicated that once zirconium 95 was absorbed by soils, it was very difficult to unbind by water. (2) Most of zirconium 95 remained in the upper layer soils. In panfan red soil and red yellow earth, 90.05%～97.47%, 96.02%～97.16% of the zirconium～95 concentration was in the upper 0～0.4cm soils layer respectively, which indicated that both soils had relatively strong adsorption. The results of comparing their change trends clarifed thatthe capability of red yellow earth absorption was slightly better than that of Panfan red soil.