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化学学报
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化学学报 ›› 1989, Vol. 47 ›› Issue (11): 1109-1112. 上一篇    下一篇

研究论文

有机配合剂稳定高价稀土元素的研究 I.丙二酸水溶液中稳定Pr(IV)的研究

吴大庆;冯殿忠   

  1. 浙江大学化学系;兰州大学化学系
  • 发布日期:1989-11-15

Studies on stabilization of high valence rare earth with organic complexing agent: I. On the stability of Pr(IV) in aqueous malonic acid solution

WU DAQING;FENG DIANZHONG   

  • Published:1989-11-15

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本文通过751G型发光光度计和pHS-2型酸度计, 研究了有机配合剂(Pr(IV)-CH~2(COO)~2^-^2)碱式碳酸盐溶于丙二酸水溶 液中, Pr(IV)在该溶液中的行为和稳定情况。总Pr量用EDTA配位滴定法, 二甲酸橙作指示剂;Pr(IV)分析用碘量法, 并扣除空白。

关键词: 分光光度法, 稳定性, 水溶液, 反应动力学, 还原, ＥＤＴＡ, 二甲酚橙, 碘量法, 丙二酸, 镨

Under certain condition, Pr(IV,III) basic carbonates are soluble in aqueous solution of malonic acid to yield an yellow complex Pr(IV)-CH2(CO2)22- which shows a broad characteristic absorption band at 265 nm. The complex composition ratio of Pr(IV)-CH2(CO2)22- determine by equilibrium shift is 1:2. Reduction kinetics of Pr(IV)-OH2(CO2)22- complex in aqueous solution is pseudo a first order reaction for Pr(IV). The various factors effecting the stability of Pr(IV)-CH2(CO2)22- complex in the solution were also studied by spectrophotometric methods.

Key words: SPECTROPHOTOMETRY, STABILITY, AQUEOUS SOLUTION, REACTION KINETICS, REDUCTION, EDTA, XYLENOL ORANGE, IODOMETRY, MALONIC ACID, PRASEODYMIUM

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