Determination of ion mobilities of radionuclides in a free electrolyte. Methods and experimental organization

Milanov, M.; Doberenz, W.; Marinov, A.; Khalkin, V.A.

doi:10.1007/bf02227333

Cited by 31 publications

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“…Using the method of electrophoresis in free electrolyte solutions [10,11], we proved in our previous work that astatine forms complexes with EDTA [12], To obtain additional Information on this class of At(6)'^ Compounds, we carried out experiments with another complexone -nitrilotriacetic acid (NTA). Here we also used the electromigration technique which is very convenient to study the behaviour of carrier-free radionuclides.…”

Section: Introductionmentioning

confidence: 99%

Nitrilotriacetate Complex of Univalent Astatine

Schumann¹,

Milesz²,

Jovchev³

et al. 1992

Radiochimica Acta

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Formation of the complex of the Univalent astatine cation with nitrilotriacetic acid (AtL)^^ and its stability constant (lgA^i = 8.97(4). 25 C, fi = 0.1) have been found experimentally for the first time. The complex is stable in Perchlorate solutions in presence of 5 • 10"' mol • 1"' of the oxidizer Na2S208 in the interval 4 < pH <8.5. The complex is supposed to be destroyed in weak alkaline solutions by reduction of astatine to astatide. The deprotonation constant of hypoastatic acid pA^dp = 5.23(9) was found to be lower than determined previously.The investigation was carried out by the method of ion electrophoresis in free electrolyte solutions.

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Section: Introductionmentioning

confidence: 99%

Nitrilotriacetate Complex of Univalent Astatine

Schumann¹,

Milesz²,

Jovchev³

et al. 1992

Radiochimica Acta

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“…The detector was connected to a multichannel amplitude analyser operating in a multiscalar mode. It allowed simultaneous registration of the distance from the active zone maximum to the introduction place and the time elapsed since the beginning of the experiment [24,25]. The location of the active zone was determined 15-20 times during one experiment which continued as long as 1.5 -2 hours.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Astatine Cation Electromigration

et al. 1989

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Electromigration of astatine ( 210 ' 2 " At) has been investigated in aqueous solutions of 0.25 mole I" 1 H(Na)C10"+5 • 10" 3 mole Γ 1 K 2 Cr 2 0, orNa 2 S 2 0, at 25°C, 0.7 < pH < 10.4. Like K 2 Cr 2 0,, Na 2 S 2 0" seems to oxidize astatine only to At(0) + , i. e. to an univalent cation, probably being protonized hypoastatine acid (H 2 0) n At + . The literature data on oxidation of astatine by Na, S 2 0 8 to At 3+ (AtO + ) were not confirmed. The mean mobility of the At(©) + cation is well described by the empiric equation _ = "At(Q) + (1 + *" dp ·«"'+)-(1+6 pH) where = 7.6(3.0)· 10" 5 molel" 1 is the deprotonation constant of (H 2 0) n At + , δ =0.18; "ΑΙ(Θ) + =+3.80(5) Χ ΙΟ" 4 cm 2 V"' s" 1 . In solutions of K 2 Cr 2 0 7 with pH > 1.7 and in solutions without oxidation agents At(0) + is unstable and is converted to a neutral form, probably, At 0 .

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“…[2][3][4]. Special features guarantee constancy of the apparatus and of the electrolyte parameters (electric field strength gradient ΔΕ, temperature and chemical composition of the electrolytes), in particular of the pH of the solutions.…”

Section: Electromigration Methodsmentioning

confidence: 99%

Electromigration of Carrier-free Radionuclides 8. Hydrolysis of ²⁴⁹Cf (III) in Aqueous Solution

et al. 1989

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The overall ion mobilities of carrier-free Cf (III) have been measured in aqueous Perchlorate solutions by means of a modified version of the electromigration method. By mathematical processing of the experimental data the stoichiometric hydrolysis constants p0 3 = 18.6 (3) and pK t =6-2(2) at μ =0.10, T = 298.1(1) K, were calculated. A limit of pK 4 ^ 14.4(3) results from the fact that no evidence of formation of anionic hydrolysis products in alkaline solutions has been found.The individual ion mobility of Cf 3 + was found to be «Î, fî + = +5.15(16) · 10" 4 cm 2 s" 1 V" 1 .

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Determination of ion mobilities of radionuclides in a free electrolyte. Methods and experimental organization

Cited by 31 publications

References 0 publications

Nitrilotriacetate Complex of Univalent Astatine

Nitrilotriacetate Complex of Univalent Astatine

Investigation of Astatine Cation Electromigration

Electromigration of Carrier-free Radionuclides 8. Hydrolysis of ²⁴⁹Cf (III) in Aqueous Solution

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Determination of ion mobilities of radionuclides in a free electrolyte. Methods and experimental organization

Cited by 31 publications

References 0 publications

Nitrilotriacetate Complex of Univalent Astatine

Nitrilotriacetate Complex of Univalent Astatine

Investigation of Astatine Cation Electromigration

Electromigration of Carrier-free Radionuclides 8. Hydrolysis of 249Cf (III) in Aqueous Solution

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Electromigration of Carrier-free Radionuclides 8. Hydrolysis of ²⁴⁹Cf (III) in Aqueous Solution