Direct Spectroscopic Determination of Europium (II) Concentration During Europium (II) Electro-Reduction in Hydrochloric Acid Medium

Ludek Jelinek, Tsuyoshi Arai, Wei Yuezhou, Mikio Kumagai

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UV-Vis spectroscopy was used to directly determine the concentration of Eu (II) during electroreduction of Eu (III) in hydrochloric acid medium. Electroreduction was carried out in a flow type electrolyzer with glassy carbon cathode at the constant potential of - 800 mV vs. Ag/AgCl. The effects of oxygen and concentration of hydrochloric acid on the system were investigated. For 0.01 mol·L-1 hydrochloric acid, calibration curves for Eu (II) absorption bands at 248 and 320 nm were constructed. Molar absorption coefficients were estimated to be 2016 and 648 L·mol-1 · cm-1, respectively. The absorbance strongly decreased with decrease in pH of the solution, whereas concentration of chloride had only a negligible effect.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalJournal of Rare Earths
Issue number1
Publication statusPublished - 2007 Feb
Externally publishedYes



  • Eu(II)
  • UV spectroscopy
  • electroreduction
  • hydrochloric acid
  • rare earths

ASJC Scopus subject areas

  • Chemistry(all)
  • Geochemistry and Petrology

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