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

Ludek Jelinek, Tsuyoshi Arai, Wei Yuezhou, Mikio Kumagai

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
Volume25
Issue number1
DOIs
Publication statusPublished - 2007 Feb
Externally publishedYes

Fingerprint

Europium
europium
Hydrochloric Acid
hydrochloric acid
Glassy carbon
absorption coefficient
Ultraviolet spectroscopy
absorbance
Chlorides
Absorption spectra
Cathodes
spectroscopy
chloride
Calibration
Oxygen
calibration
oxygen
carbon
effect

Keywords

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

ASJC Scopus subject areas

  • Chemistry (miscellaneous)

Cite this

Direct Spectroscopic Determination of Europium (II) Concentration During Europium (II) Electro-Reduction in Hydrochloric Acid Medium. / Jelinek, Ludek; Arai, Tsuyoshi; Yuezhou, Wei; Kumagai, Mikio.

In: Journal of Rare Earths, Vol. 25, No. 1, 02.2007, p. 1-5.

Research output: Contribution to journalArticle

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