Anion exchange of metal complexes—VI

Abstract

Abstract The distribution of tracer 63Ni between the strongly basic anion exchange resin, Dowex 1 × 8, and solutions of sodium, potassium, ammonium, and lithium thiocyanate have been determined. No effects attributable to polynucleation were observed with concentrations of tracer up to 2·92 × 10−6 M. Since counting 63Ni, a soft β-emitter, is best accomplished with liquid scintillation techniques, a preliminary investigation was necessary to establish and characterize the best liquid scintillation mixture. The distributions were determined for the 0·05–5·0 M concentration range of the thiocyanate solution. Above 2·60 M, increasing sorbability was in the order NH4+ > K+ > Na+ > Li+, with a maximum at ∼ 0·3 M for Na+ and Li+, and 1·0 M for K+ and NH4+. Corrected distributions were determined by employing resin invasion data; from the corrected distributions, overall complexity parameters relating to the neutral complex were evaluated by curve fitting. Their values were found to be: k +2 ∗ =2·36×10 −3 ; k +1 ∗ =4·68×10 −1 ; k 0 ∗ =1 ( by definition ); k −1 ∗ =2·64; k −2 ∗ =1·89 . Resin sorption effects ∼ 85-fold stabilization of the neutral species over the aqueous phase.