CAJ | 학술논문

用连续提取法研究了237Np在破碎凝灰岩和凝灰质砂上的吸附。研究结果表明，48h以后，2种介质对237Np的吸附百分数相近，而且吸附的237Np在各相间的分布均以离子交换态为主。凝灰岩和凝灰质砂的阳离子交换容量差异显著，说明离子交换作用仅发生在粘土矿物的表面，凝灰岩中蒙脱石的层间没有发生阳离子交换。在28d的实验时间内，237Np在介质中的Fe-Mn氧化物-氢氧化物上的吸附百分数几乎不随时间变化。这可能是因为该吸附过程为瞬时即可完成的表面化学反应。介质内离子交换相和残余相上的吸附则显示为缓慢的吸附过程。
용련속제취법연구료237Np재파쇄응회암화응회질사상적흡부。연구결과표명，48h이후，2충개질대237Np적흡부백분수상근，이차흡부적237Np재각상간적분포균이리자교환태위주。응회암화응회질사적양리자교환용량차이현저，설명리자교환작용부발생재점토광물적표면，응회암중몽탈석적층간몰유발생양리자교환。재28d적실험시간내，237Np재개질중적Fe-Mn양화물-경양화물상적흡부백분수궤호불수시간변화。저가능시인위해흡부과정위순시즉가완성적표면화학반응。개질내리자교환상화잔여상상적흡부칙현시위완만적흡부과정。
The adsorption characteristics of 237Np on crushed tuff andtuffaceous sand from northeast Japan have been studied using sequential extraction analysis technique. With a large difference in cation exchange capacity (CEC), both materials show nearly same sorptivity for 237Np. Together with dominance of ion exchange processes in sorption indicated by sequential extraction analysis, it suggests an absence of specific sorption at sites of this kind. It's interesting to find that sorption on Fe-Mn oxyhydroxide-oxides, defined by our sequential extraction procedure, almost keep constant for both cases, without time dependency. A potential mechanism of surface chemical reaction is deduced. Kinetics with respect to exchangeable and residual portions in tuff and fuffaceous sand confirms that some slow processes are controlling radionuclide sorption.