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773115293新蟲 (著名寫手)
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翻譯一段英文文獻(數(shù)字細節(jié)沒事)
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| 99TcO4- diffusion in GMZ bentonite by through- and out-diffusion methods found that part of 99TcO4- may be reduced by Fe(II) and Da and dry density is exponential [5]. Electromigration experiments indicated that Da for selenate is range from 1.7×10-11 to 6.2×10-11 m2s-1 and no reduction of selenate [4]. The degree of compaction is one of the important factors that influence the diffusion behavior of radionuclides in the clay [6]. Increasing clays compacting can change hydration energy, overlapping electric double layers and clay pore size and structure [7]. The diffusion processes in compacted bentonite have interlayer space diffusion and interparticle diffusion [8]. Interlayer space diffusion is affected by change in compacted density and interparticle diffusion is primarily independent of compaction up to 1800 kg/m3 [7]. The compacted bentonite interlayer space is decreased from 3-layers to 2-layers of water at 1,600 kg/m3 and from 2-layers to 1-layer of water at 1800 kg/m3 [9, 10]. The interlayer space decreases from 1.88 nm to 1.56 nm when increasing dry density from 1300 to 1600 kg/m-3 and can be expected decrease beyond 1600 kg/m-3 [11]. |
| 99TcO4-在GMZ膨潤土中的擴散通過向外擴散方法發(fā)現(xiàn)99TcO4-部分被Fe(II)和DA還原和干密度指數(shù)衰減[ 5 ]。電遷移試驗表明,硒酸鹽的Da值在1.7至6.2××10-11 m2s-1范圍,無硒酸鹽的還原 [ 4 ]。壓實度是影響粘土中放射性核素擴散行為的重要因素之一。增加粘土壓實度可以改變水化能量,重疊的雙電層及粘土的孔隙大小和結(jié)構(gòu)[ 7 ]。擴散過程在壓實膨潤土有夾層空間擴散和顆粒擴散[ 8 ]。夾層空間擴散受壓實密度變化的影響,顆粒擴散不受壓實度影響可達到1800公斤/立方米[ 7 ]。壓實膨潤土夾層空間從水層的三層下降到二層為1600公斤/立方米,再從水層的二層降至一層為1800公斤/立方米[ 9,10 ]。當(dāng)干密度從1300公斤/米3增大到1600公斤/米,層間距由1.88 nm減小到1.56 nm時,預(yù)期干密度可隨層間距減少而增大至超過1600公斤/米3 [ 11 ]。 |

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