Molar entropy of the selenium (VI)/(IV) couple obtained by cyclic voltammetry

Doi, Reisuke

Cyclic voltammetry was performed to determine the molar entropy of the Se(VI/IV) couple. In order to obtain the ion interaction coefficient between HSeO $_{4}$ $^{-}$ and Na $^{+}$ , $_{T}$ (HSeO $_{4}$ $^{-}$ , Na $^{+}$ ), the following reaction involving uncharged species as reductant was used: HSeO $_{4}$ $^{-}$ + 3H $^{+}$ + 2e $^{-}$ = H $_{2}$ SeO $_{3}$ + H $_{2}$ O. Half wave potentials were measured in acidic sodium nitrate solutions as a function of the molality of Na $^{+}$ . A number of temperatures were used: 15, 25, 35 and 50 $^{circ}$ C. SIT was used to calculate the HSeO $_{4}$ $^{-}$ /H $_{2}$ SeO $_{3}$ standard potential, $_{rm HSeO4-/H2SeO3}$ (, 0), and $_{T}$ (HSeO $_{4}$ $^{-}$ , Na $^{+}$ ) at each temperature. The following molar entropy was derived from the temperature dependence of $_{rm HSeO4-/H2SeO3}$ (, 0): $_{r}$ S $^{0}$ $_{m}$ /2 = -0.30.3 mV K $^{-1}$ . At 25 $^{circ}$ C $_{T}$ (HSeO $_{4}$ $^{-}$ , Na $^{+}$ ) was 0.290.04 kg mole $^{-1}$ .

Language	:	English
Journal	:	Journal of Nuclear Science and Technology
Volume	:	51
Number	:	3
Pages	:	p.359 - 368
Publication Year/Month	:	2014/03
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Paper URL	:	https://doi.org/10.1080/00223131.2013.872059
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Keywords	:	no keyword
Research Facility	:	ENTRY(地層処分基盤研究施設)
Press Release	:
Article of JAEA R&D Review	:	Prediction of Radionuclide Speciation in Groundwater; Determination of Standard Thermodynamic Data of Se(VI)/(IV) Couple[/]
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Registration No. : AA20130502
JAEA Abstracts No. : 42000309
Paper Submission No. : 13877

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