Temperature and ionic strength influence on U(VI/V) and U(IV/III) redox potentials in aqueous acidic and carbonate solutions | Zendy

Hélène Capdevila | Zendy; Pierre Vitorge | Zendy

Open Access

Temperature and ionic strength influence on U(VI/V) and U(IV/III) redox potentials in aqueous acidic and carbonate solutions

Author(s) -

Hélène Capdevila,

Pierre Vitorge

Publication year - 1990

Publication title -

journal of radioanalytical and nuclear chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.374

H-Index - 67

eISSN - 1588-2780

pISSN - 0236-5731

DOI - 10.1007/bf02039609

Subject(s) - chemistry , aqueous solution , redox , ionic strength , carbonate , ionic bonding , electrochemistry , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , electrode , ion , organic chemistry , chromatography

Redox potentials: E(UO22+/UO2+)=60±4 mV/NHE, E(U4+/U3+)=–630±4mV/NHE measured at 25°C in acidic medium (HClO4 1M) using cyclic voltametry are in accordance with the published data. From 5°C to 55°C the variations of the potentials of these systems (measured against Ag/AgCl electrode) are linear. The entropies are then constant: [$$\log \frac{{\beta _3 U(V)}}{{\beta _3 U(VI)}} = - 14.7 \pm 0.5$$ and then$$\log \beta _3 U(V) = 6.6 \pm 0.3.$$

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