土壤学报2017，Vol.54Issue(3)：785-793,9.DOI:10.11766/trxb201608160166
不同喷淋强度对核素Sr-90在土壤中迁移的影响
Effect of Spraying Intensity on Migration of Sr-90 in Soil
摘要
Abstract
Based on the dynamic soil column method in laboratory,experiment was conducted on studying the migration of radionuclide Sr-90 in Sand relative to different spraying intensity(spraying intensity was designed to 120 ml d-1,60 ml d-1,30 ml d-1,and the corresponding experimental time were 51, 102204 day respectively).Results showed that migration distance of Sr-90 concentration peak in the soil columns more or less the same,were 42.3 cm,46.2 cm,44.4 cm,Which was positively related to intensity and duration of the spraying. In addition,the concentration distribution curves of Sr-90 in soil column section all exhibited asymmetry and"tailing"phenomena under the three different spray intensity,i.e. After Sr-90 was leached down from the source layer,it was adsorbed to the Sand,thus lagging behind and getting desorbed after the peak concentration passing the observation point,hence Sr-90 concentration remained to be quite high in soil columns for a long time. With the aid of HYDRUS-1D software,two numerical models were established for radionuclide migration,one based on equilibrium adsorption and the other on non-equilibrium adsorption. It was found that the non-equilibrium sorption model,which took into account the first-order rate coefficients β,could be used to better explain the asymmetry and tailing phenomena. Based on fitting the measurements of Sr-90 concentrations in the soil columns,distribution coefficient of Sr-90 in the Sand was figured out to be 0.73 ml g-1,0.70 ml g-1 and 0.72 ml g-1 relative to intensity of the spraying,which shows that intensity of the spraying did not have much effect on distribution coefficient of Sr-90.关键词
喷淋强度/土柱试验/核素迁移/平衡吸附/非平衡吸附Key words
Spraying intensity/Soil column experiment/Radionuclide migration/Equilibrium adsorption/Non-equilibrium adsorption分类
资源环境引用本文复制引用
朱君,邓安嫦,石云峰,陈超,刘团团,张艾明..不同喷淋强度对核素Sr-90在土壤中迁移的影响[J].土壤学报,2017,54(3):785-793,9.基金项目
中国辐射防护研究院院基金项目 Supported by the Foundation of China Institute for Radiation Protection （）
