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轉(zhuǎn)身丶忘不掉

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[求助] 幫忙翻譯一下，本人英語水平有限，謝謝了，附有圖片

For the disposal of high-level waste (HLW) in a deep geological formation as Boom Clay, safety assessment studies have shown that long lived 79Se is one of the more critical fission products. Therefore, the knowledge of its migration properties (diffusion, retention) through the geological barrier (Boom Clay) is of paramount importance. The migration behaviour of selenium strongly depends on its speciation. Under reducing conditions, selenide would be the dominant species and selenium migration would mainly be controlled by the low solubility of Se(II)-bearing minerals. However Se species are often found in redox disequilibrium and more oxidized species might also coexist. Therefore, the study of selenate migration requires attention, as it might be the most mobile selenium species in the host rock. Electromigration experiments performed with a 75Se labeled selenate in Boom Clay indicate a high mobility for this species. The apparent diffusion coefficient (Dapp) of selenate in Boom Clay is estimated from electromigration experiments performed under different electric fields. Using two independent approaches, the value of Dapp for selenate is shown to fall in the range from 1.7×10-11 to 6.12×10-11m2s-1.Moreover, no reduction of selenate in Boom Clay was observed.
Keywords: Electromigration; Diffusion coefficients; Selenium; Speciation; Boom clay; Radioactive waste

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1樓 2014-08-29 16:41:53

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cmds1907

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轉(zhuǎn)身丶忘不掉: 金幣+5, 翻譯EPI+1, ★★★★★最佳答案 2014-08-29 23:19:10

對(duì)一個(gè)地下深處的地質(zhì)建造（如Boom粘土）中的高放射性核廢料(HLW)的處置而言，安全評(píng)價(jià)研究表明，壽命長(zhǎng)79 Se是更關(guān)鍵的裂變產(chǎn)物之一。因此，有關(guān)經(jīng)地質(zhì)屏障(Boom粘土)遷移特性(擴(kuò)散、保留)的知識(shí)是至為重要的。硒的遷移行為很大程度上取決于其物種形成。在還原條件下，硒化物將是優(yōu)勢(shì)物種，硒的遷移主要會(huì)由低溶解度的含礦物質(zhì)的Se(II)控制。然而Se物種通常發(fā)現(xiàn)在氧化還原不均衡，而更多的和氧化物種也可能共存。因此，硒酸鹽遷移的研究必須引起注意，因?yàn)榇蠖鄶?shù)移動(dòng)硒物種它可能是在母巖中。Boom粘土上75 Se標(biāo)記的硒酸鹽的電遷移實(shí)驗(yàn)表明，這個(gè)物種具有高遷移率。Boom粘土上硒酸鹽的表觀擴(kuò)散系數(shù)(Dapp)評(píng)價(jià)自不同電場(chǎng)下所進(jìn)行的電遷移實(shí)驗(yàn)。使用兩個(gè)獨(dú)立的方法，證明了硒酸鹽的Dapp值落在1.7×10-11到6.12×10-11m2s-1范圍內(nèi)。此外，觀測(cè)到Boom粘土上硒酸鹽沒有還原。
關(guān)鍵詞: 電遷移；擴(kuò)散系數(shù)；硒；物種（形成）；Boom粘土；放射性廢物

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2樓2014-08-29 22:58:02

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