Re-MDP(HEDP)中铼的氧化态测定
DETERMINATION OF THE OXIDATION STATE OF RHENIUM IN RHENIUM-MDP(HEDP)
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摘要: 用电位滴定法和萃取法研究了Re MDP ,Re HEDP中铼的氧化态。实验结果表明 :Re MDP反应体系中 pH值越低 ,中心离子铼的平均氧化数越小 ;在 pH值为 2 0时用I- 3 滴定 ,低价的Re(Ⅲ ,Ⅳ ) MDP被氧化为Re(Ⅴ ) MDP ;在pH值为 2 5时 ,Re HEDP中铼的氧化态主要为 + 4价 ,在 pH值为 2 0时用I- 3 滴定 ,Re(Ⅳ ) HEDP被氧化为Re(Ⅴ ) HEDP ;在Vc +Sn2 + 的体系中 ,ReO4 - 仅被Sn2 + 还原 ,用I3 - 滴定 ,Vc先于Sn2 + 被氧化Abstract: The oxidation state of rhenium in Re MDP(HEDP) is studied by the method of extraction and potential titration. The experiment results are shown as follows: (1) As the pH of Re MDP reaction system reduced, the average oxidation state of rhenium droped. Re MDP of low valence is oxidized to Re(Ⅴ) MDP when it is titrated by I 3 - at pH 2.0; (2) The oxidation state of rhenium in Re HEDP is mostly +4 valence. The Re(Ⅳ) HEDP is oxidized to Re(Ⅴ) HEDP when it is titrated by I 3 - at pH 2.5; (3)ReO 4 - is only reduced by Sn 2+ in the reduction system of Vc+Sn 2+ , but Vc is oxidized earlier than Sn 2+ when it is titrated by I 3 -.
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