Thorium Complexes with Chloride, Fluoride, Nitrate, Phosphate and Sulfate¹

Studies on the Uptake and Column Chromatographic Separation of Eu, Th, U, and Am by Tetramethylmalonamide Resin

“…The stability constants of actinide nitrates are larger than those of actinide 10 -2 10 -1 10 0 10 1 chlorides implying that the formation of ion-pairs with chloride was lower than that with nitrate. [20][21][22] The Gibbs energy for the transfer of chloride ion from the aqueous phase to the organic phase is higher than that of nitrate ions. [23] Because of the reduced ion-pair formation and higher Gibbs energy of transfer, the extraction of An(III) from chloride media was lower than from nitrate media.…”

Modeling of ionic equilibria of trace metals (Cu2+, Zn2+, Cd2+) in concentrated aqueous electrolyte solutions at 25 °C

“…Some of them were calculated from activity data for single electrolytes [12][13][14] and from potentiometric [4,5,21,[26][27][28][29][30][31][32] and solubility [15][16][17][18][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] studies. Uncertainty is conditioned mainly by insignificant variation of the parameter b ij with ionic strength and, in the majority of cases, specifies applicability of the model to the description of experimental data.…”

“…1) [26], NaCl [27], KCl and NaClO 4 [28] solutions. Right upper panel: second dissociation constant of sulfuric acid in NaCl [29] and NaClO 4 (hollow circles: [30]; box: [31]) solutions. Bottom: first (left panel) and second (right panel) dissociation constants of carbonic acid in NaClO 4 [4,32], NaCl and KCl [5] solutions (values for dissociation constants of carbonic acid in KCl solutions were interpolated from data measured at 0, 50, and 75 • C).…”

“…c From Na 2 SO 4 (H 2 O) 10 (mirabilite) solubility in NaCl [42], NaClO 4 [43], NaNO 3 [40], NaOH [41], and H 2 SO 4 [39] solutions. d From pK(HSO − 4 ⇔ H + + SO 2− 4 ) in NaCl [29] and NaClO 4 [30,31]. e From Na 2 CO 3 (H 2 O) 10 (natron) solubility in NaCl [15], NaNO 3 [47], NaOH [49], and Na 2 SO 4 [48] solutions.…”

Hydrophilic Actinide Complexation Studied By Solvent Extraction Radiotracer Technique

“…Thus, the conclusion reached at p. 27 that Pu(II1) should be easy to study in the air-water system becomes less valid as pH increases. However, in the presence of a strong reductant (p. 29) R,,, is so large that hydrolysis will have little effect, and the + 3 state…”