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Selenium, which is important for dose evaluation in safety assessment (79Se: half-life T1/2>6.5104years), is one of the redox-sensitive elements. It is known from conventional studies that Se forms anionic species in solution and is slightly sorbing onto bentonite (e.g., Shibutani and Yui, 1996). Selenium is found in oxidation states between II and VI. In the pH of neutral waters, SeO42-  (selenate) is predominant under strongly oxidizing conditions, while HSe(hydroselenide) dominates under reducing conditions,and SeO32-  (selenide) is just predominant at the boundary between both redox conditions (Brookins,1988; Ticknor et al., 1988). Thus, the chemical speciation of Se depends on the redox condition and pH of the solution, which may result in a limited retardation of Se in compacted bentonite.

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ÔÚ¼ÁÁ¿Ó밲ȫÆÀ¹ÀÖÐÓÐÖØÒª×÷ÓõÄÎø(79Se: °ëË¥ÆÚT1/2>6.5x104Äê)£¬ÊÇÑõ»¯»¹Ô­Ãô¸ÐÔªËØÖ®Ò»¡£ÒÔÍùµÄÑо¿¸ßËùÎÒÃÇ£¬ÎøÔÚÒºÏàÖÐÐγÉÒõÀë×ÓÎïÖÊ£¬²¢Çá΢Îü¸½ÓÚµ½ÅòÈóÍÁ (ÈçShibutaniºÍYui, 1996)¡£ÔÚ-IIÓëVIÖ®¼ä£¬Îø´¦ÓÚÑõ»¯×´Ì¬¡£ÔÚÖÐÐÔË®¼°Ç¿Ñõ»¯Ìõ¼þÏ£¬SeO42-£¨ÎøËáÑΣ©ÊÇÖ÷ÒªÐÎʽ£¬¶øÔÚ»¹Ô­Ìõ¼þÏÂÒÔHSe£¨Ë®ºÏÎø»¯ÎռÓÅ£¬¶øÔÚÑõ»¯Ó뻹ԭµÄ±ß½çÌõ¼þÏ£¬ÔòÒÔSeO32- £¨Îø»¯ÎռÖ÷µ¼ÐÎʽ(Brookins,1988; Ticknor et al., 1988)¡£Òò´Ë£¬SeµÄ»¯Ñ§²úÎïÈ¡¾öÓÚÑõ»¯»¹Ô­Ìõ¼þºÍÈÜÒºµÄpHÖµ£¬¶ø²úÎïµÄ²»Í¬ËùÒýÆðµÄÎøÔÚº»ÊµÅòÈóÍÁÖеijÙÖÍ×÷ÓÃÊÇÓÐÏ޵ġ£
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