CAJ | 학술논문

腐殖酸是环境中普遍存在的一种有机物，它能通过络合作用和氧化还原反应影响放射性核素的迁移。本文通过贯穿扩散实验，在不同膨润土密度和不同腐殖酸接触时间下，研究了 Re （Ⅶ）在高庙子膨润土中的扩散，得到了有效扩散系数 De 和容量因子α。结果显示，随着膨润土密度从1600 kg／m3增加至1800 kg／m3，De 从1.8×10－11 m2／s减小至0.59×10－11 m2／s。随着腐殖酸接触时间由0 d增加到60 d ，De 由0.59×10－11 m2／s增大至0.83×10－11 m2／s。实验得到的α值均小于总孔隙率，说明在腐殖酸存在的条件下，Re（Ⅶ）可能仍以阴离子的形态在膨润土中扩散。
부식산시배경중보편존재적일충유궤물，타능통과락합작용화양화환원반응영향방사성핵소적천이。본문통과관천확산실험，재불동팽윤토밀도화불동부식산접촉시간하，연구료 Re （Ⅶ）재고묘자팽윤토중적확산，득도료유효확산계수 De 화용량인자α。결과현시，수착팽윤토밀도종1600 kg／m3증가지1800 kg／m3，De 종1.8×10－11 m2／s감소지0.59×10－11 m2／s。수착부식산접촉시간유0 d증가도60 d ，De 유0.59×10－11 m2／s증대지0.83×10－11 m2／s。실험득도적α치균소우총공극솔，설명재부식산존재적조건하，Re（Ⅶ）가능잉이음리자적형태재팽윤토중확산。
Humic acid ,a kind of organic matter ,is ubiquitous in environment ,w hich may affect the migration of radionuclides by complexation and redox reaction .The effect of humic acid on the diffusion of Re(Ⅶ) in GMZ bentonite was investigated at different bentonite dry densities and humic acid contact time through diffusion method . T he effective diffusion coefficient De and capacity factor αwere obtained .The De decreases from 1.8 × 10 -11 m2/s to 0.59 × 10 -11 m2/s with the dry density increasing from 1 600 kg/m3 to 1 800 kg/m3 . T he De increases from 0.59 × 10-11 m2/s to 0.83 × 10-11 m2/s with the humic acid contact time increasing from 0 day to 60 days .All the αvalues are less than the total porosities ,which implies that Re(Ⅶ ) may be still the anion species in diffusion in compacted bentonite in presence of humic acid .