On-line separation of Pu(III) and Am(III) using extraction and ion chromatography

Complexation of tetravalent actinides (Th, U, Np, Pu) with 2,6-pyridinedicarboxylic acid in aqueous solutions

“…For this purpose, we used the formula log β (An) = log β' (An) + 3(pK a1 + pK a2 ) -6pH, where K a1 and K a2 are the dissociation constants of H 2 PDC. Taking into account the values given in[1], pK a(1,2) = 2.07 and 4.66 at 25°C (ionic strength 0.1), we can see that β (An) is by approximately 16 orders of magnitude higher than β' (An) in 0.2 M acid (pH ~0.7).…”

“…For example, Jernström et al [1] suggested a procedure for separation of Pu(III) and Am(III) from trivalent lanthanides, followed by separation of Pu(III) and Am(III), using 2,6-PDCA in one of the steps. 2,6-PDCA can also be used for decontamination of radioactively contaminated industrial equipment.…”

“…In the solutions obtained, the concentration of the complexes An(PDC) 2+ was ~10 -3 M, with the aqua ions An 4+ ·aq and complexes An(PDC) 2 virtually absent (spectra 2 in Figs. [1][2][3]. To these solutions, we added Th(ClO 4 ) 4 in 0.2 M HClO 4 in an amount required for the formation of a noticeable fraction of aqua ions An 4+ ·aq in accordance with reaction (4).…”

Critical comparison of radiometric and mass spectrometric methods for the determination of radionuclides in environmental, biological and nuclear waste samples

“…Benkhedda et al [59] reported an automated analytical method for the determination of 226 There are many works have been carried out on the development of an automated method for the determination of actinides [292,[296][297][298][299][300][301][302][303]]. An HPLC with mix bed ion exchange column has been used to separate actinides and employing ICP-MS used for the detection.…”

HPLC Method for Determination of Th, U and Pu in Irradiated (Th,Pu)O2 using Mandelic Acid as an Eluent

“…are time consuming, susceptible to handling errors, and pose a potential risk of contamination [8,9]. Development of new methodologies for the separation and determination of Th, U and Pu is of considerable importance for thorium based nuclear fuel cycle and also in view of the environmental concerns [10][11][12][13][14][15]. The methods offering reduced analysis time, less generation of liquid waste and minimum dose to operator would have an edge in such applications.…”