VOLTAMMETRIC STUDY ON THE REDUCTION OF RARE EARTHS IN ACETONE
来源期刊：Journal of Rare Earths1990年第3期
论文作者：关福玉 高小霞
文章页码：212 - 217
摘 要：<正> The voltammetric and polarographic behaviours of 14 rare earth elements were investigated in anhydrousacetone.The influence of residual oxygen on their waves was examined.At a concentration lower than 6×10-4mol/L,Eu3+,Yb3+and Sm3+ produce two waves and other rare earth ions exhibit only one wave.When the concentration is greater than 8×10-4mol/L,two waves could be observed on the reductionof Yb2+,Sm2+and other RE3+ions except for Eu3+.By adding 0.6% H2O(or 1×10-4mol/L NH4ClO4)one well-defined wave appears instead of two.The phenomenon is explained that a thin deposit film may beformed at electrode surface owing to the interaction of RE3+ with O2-,which is the reduction product of traceoxygen in aprotic solvent.In the presence of a proton donor such as H2O or NH4+,oxygen reduces directly toH2O2 and eliminates the appearance of two waves.
关福玉，高小霞
摘 要：<正> The voltammetric and polarographic behaviours of 14 rare earth elements were investigated in anhydrousacetone.The influence of residual oxygen on their waves was examined.At a concentration lower than 6×10-4mol/L,Eu3+,Yb3+and Sm3+ produce two waves and other rare earth ions exhibit only one wave.When the concentration is greater than 8×10-4mol/L,two waves could be observed on the reductionof Yb2+,Sm2+and other RE3+ions except for Eu3+.By adding 0.6% H2O(or 1×10-4mol/L NH4ClO4)one well-defined wave appears instead of two.The phenomenon is explained that a thin deposit film may beformed at electrode surface owing to the interaction of RE3+ with O2-,which is the reduction product of traceoxygen in aprotic solvent.In the presence of a proton donor such as H2O or NH4+,oxygen reduces directly toH2O2 and eliminates the appearance of two waves.
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