^(237)Np在黄土上的吸附  

SORPTION OF ^(237)Np ON LOESS

作　　者：王旭东[1] 游志均[1] 刘志辉[1] 张华[1] 李祯堂 

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护》2005年第4期223-226,230,共5页Radiation Protection

摘　　要：采用静态法测定了237Np在黄土上的吸附比,开展了去除特定物相(包括碳酸盐、Fe/Mn氧化物/氢氧化物和有机质)后黄土对237Np的吸附,以及地下水离子强度等因素对黄土吸附237Np影响的研究,并采用连续提取程序对吸附了237Np的黄土进行了分析。实验结果表明:237Np在黄土上的吸附较强,其吸附比为854mL/g;黄土中碳酸盐相对吸附的贡献最大,大体可据之对黄土吸附237Np的能力进行判断。Batch tests of 237 Np sorption were carried out on loess, with sequential extraction analysis included. Studies with loess samples free of carbonate, Fe/Mn oxide/hydroxide, and organics respectively were also performed, along with those focused on effects of ion strength. 237 Np was found to have strong affinity on loess with R_d of 854?mL/g. R_d almost keep steady within the range of ion strength investigated, which suggests ion exchange process is far from important for the sorption. While carbonate phase contributes most to the sorption, clay minerals and organics play a minor role. The carbonate content in loess could be considered as an indication for sorption capacity of 237 Np on it.

关 键 词：^237NP 黄土 氢氧化物 离子强度 连续提取 碳酸盐相 吸附比 静态法 有机质 地下水 

分 类 号：X837[环境科学与工程—环境工程]