Electromigration of carrier-free radionuclides

Individual ion mobilities «Se^t of carrier-free La(III), Eu(III), Gd(III), Tb(III), Tm(III), Yb(III), Lu(III), Ain(III) and Cf(III) were measured in dependence on the pH of aqueous Perchlorate electrolytes at /i = 0.10, 7=298.1 K. Two different levels of ion mobilities were found in neutral (pH > 5) and acidic (pH < 2.5) solutions for most of the cations investigated. Exceptions are Eu(III) and Cf(III).The observed relationships between the crystallographic radii of the trivalent /-elements and their UMCI* data in acidic and neutral electrolytes confirm the hypothesis of S-shaped changes of hydratation parameters within the lanthanide and actinide series.

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“…This set-up for direct measurement of ion mobilities in aqueous electrolytes was applied to investigations of -infinite ion mobility of [8],…”

Section: Introductionmentioning

confidence: 99%

Ion Mobilities of Trivalent f-Elements in Aqueous Electrolytes

Rösch

Khalkin

1990

Radiochimica Acta

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“…It was applied to the determination of limiting mobilities of microconcentrations of iodine and terbium ions [7]. This technique later on has been used to investigate the infinite ion mobility of 140 La 3ϩ [8] and 241 Am 3ϩ [13], the hydrolysis reactions of 205,206 Bi 3ϩ [9], 239 NpO 2 ϩ [10], 209Ϫ211 At ϩ [11], 169 Yb 3ϩ [12], 241 Am 3ϩ [13] and 249 Cf 3ϩ [14], the protonation of 131 IO 3 Ϫ [15], the effect of pH on the ion mobility of * Author for correspondence (E-mail : frank.roesch@uni-mainz.de).…”

Section: Introductionmentioning

confidence: 99%

A device for on-line electromigration measurements of radioelements in free electrolytes

Mauerhofer¹,

Kling²,

Hiller³

et al. 2000

Radiochimica Acta

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An electromigration device has been developed for the on-line measurement of absolute individual ion mobilities of radioactive species in free electrolytes. The device is composed of a migration cell, a γ-radiation scanning unit and a data processing system. The performance of two BGO-scintillators as scanning unit and the reliability of an on-line data processing system were studied with calibrated radioactive sources of given velocities. The system was found to work with a high reproducibility rate. The migration velocities were determined with an accuracy better than 1%.

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