NDLI: Chemical and electrochemical behavior of metallic technetium in acidic media

Content Provider	Springer Nature Link
Author	Ferrier, Maryline Poineau, Frederic Jarvinen, Gordon D. Czerwinski, Kenneth R.
Copyright Year	2013
Abstract	The chemical and electrochemical properties of technetium metal were studied in 1–6 M HX and in 1 M NaX (pH 1 and 2.5), X = Cl, NO$_{3}$. The chemical dissolution rates of Tc metal were higher in HNO$_{3}$ than in HCl (i.e. 8.63 × 10$^{−5}$ mol cm$^{−2}$ h$^{−1}$ in 6 M HNO$_{3}$ versus 2.05 × 10$^{−9}$ mol cm$^{−2}$ h$^{−1}$ in 6 M HCl). The electrochemical dissolution rates in HNO$_{3}$ and HCl were similar and mainly depended on the electrochemical potential and the acid concentration. The optimum dissolution of Tc metal was obtained in 1 M HNO$_{3}$ at 1 V/AgAgCl (1.70 × 10$^{−3}$ mol cm$^{−2}$ h$^{−1}$). The dissolution potentials of Tc metal in nitric acid were in the range of 0.596–0.832 V/AgAgCl. Comparison of Tc behavior with Mo and Ru indicated that in HNO$_{3}$, the dissolution rate followed the order: Mo > Tc > Ru, and for dissolution potential the order: E $_{diss}$(Ru) > E $_{diss}$(Tc) > E $_{diss}$(Mo). The corrosion products of Tc metal were analyzed in HCl solution by UV–Visible spectroscopy and showed the presence of TcO$_{4}$ $^{−}$. The surface of the electrode was characterized by microscopic techniques; it indicated that Tc metal preferentially corroded at the scratches formed during the polishing and no oxide layer was observed.
Starting Page	1809
Ending Page	1817
Page Count	9
File Format	PDF
ISSN	02365731
Journal	Journal of Radioanalytical and Nuclear Chemistry
Volume Number	298
Issue Number	3
e-ISSN	15882780
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-05-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Technetium Electrodissolution Corrosion rate Nitric acid Hydrochloric acid Nuclear Chemistry Physical Chemistry Nuclear Physics, Heavy Ions, Hadrons Diagnostic Radiology Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Pollution Health, Toxicology and Mutagenesis Radiology, Nuclear Medicine and Imaging Analytical Chemistry Public Health, Environmental and Occupational Health Nuclear Energy and Engineering

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