Distinctive distributions and migrations of 239+240PU and Am-241 in Chinese forest, grassland and desert soils
Distinctive distributions and migrations of 239+240PU and Am-241 in Chinese forest, grassland and desert soils
复制标题
239 240PU和Am-241在中国森林、草原和荒漠土壤中的独特分布和迁移
DOI：
10.1016/j.chemosphere.2018.09.021
复制
发表时间：
2018
期刊：
影响因子：
8.8
通讯作者：
Huang Wenna
中科院分区：
文献类型：
--
作者：
Ni Youyi;Wang Zhongtang;Guo Qiuju;Zheng Jian;Li Sixuan;Lin Jinxian;Tan Zhaoyi;Huang Wenna
研究了239 + 240 Pu和241 Am的全球沉降物在中国不同类型土壤（森林、草原和沙漠）中的垂直分布和向下迁移。239 + 240 Pu和241 Am的平均活度分别为0.28-0.69 mBq/g和0.13-0.37 mBq/g，累积储量分别为61.53-138.99 Bq/m2和28.29-61.05 Bq/m2。用对流扩散方程（CDE）计算了239 + 240 Pu在土壤中的迁移参数，发现酸性森林土壤的表观扩散系数（D）大于碱性草原和荒漠土壤;同时采用分室模型比较了239 + 240 Pu和241 Am在连续土层中的迁移行为240 Pu和241 Am在不同类型土壤中的速度都小于0.3 cm/y，这一结果与我国短期实验室模拟结果一致。
The vertical distributions and downward migrations of the global fallout derived239+240Pu and241Am in diverse types of Chinese soils (forest, grassland and desert) were studied. The mean239+240Pu and241Am activity concentrations in the investigated soil cores were 0.28–0.69 mBq/g and 0.13–0.37 mBq/g, respectively, while the accumulative inventories were 61.53–138.99 Bq/m2for239+240Pu and 28.29–61.05 Bq/m2for241Am. The convection-dispersion equation (CDE) was used to calculate the migration parameters of239+240Pu and higher apparent dispersion coefficients (D) were observed for the acidic forest soils compared with the alkaline grassland and desert soils; meanwhile a compartment model was employed to compare the migration of239+240Pu and241Am in successive soil layers which showed that the migration behaviors of239+240Pu and241Am were rather similar; both velocities were less than 0.3 cm/y in diverse types of soils and these findings were compatible with those of short-term laboratory simulation experiments in China.