Abstract
The measurements of the distributions of Cr(III) between Dowex 1 × 8, a strongly basic anion exchanger, and solutions of sodium, lithium, potassium, and ammonium thiocyanate have been determined by the batch method employing 51 m Cr as a tracer. Due to the tendency of 51 m Cr to adsorb on the surfaces of the equipment used in the investigation, carrier chromium, as chromium nitrate, was added. Distribution isotherms were determined for thiocyanate solutions between ∼ 0·05 and ∼ 4·1 M. Increasing adsorbability above 1·0 M was in the order NH 4 + > Na + > K + > Li +. Taking resin invasion into account, corrected distribution curves were made from which overall complexity parameters related to the neutral complex were evaluated as k +3 ∗ = 9·8 × 10 −2; k +2 ∗ = 1·4 × 10 −2; k +1 ∗ = 0·78; k −1 ∗ = 10·2; k −2 ∗ = 17·0; and k −3 ∗ = 35·6 . A 200-fold stabilization of the neutral species over the aqueous phase is effected by resin sorption.
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