Systematic
surveys of the behaviour of elements on a strong base anionexchange resin have been reported for hydrochloric 1, nitri&,hydrofluoric", phosphoric4, sulfuric acid", and hydrochloric-hydrofluoricap7, nitric-hydrofluoric*vo and sulfurichydrofluoric acid mixtures 0. The adsorption characteristics in the above-mentioned mineral acids are now always applicable to separation techniques, <as stated by SPEECKE~*, who used a cl~lor~)-oxala.te medium for the separation of niobium and tantalum. Since oxalic acid is a good complcxing agent, it would be of interest to investigate the adsorption of some elements from pure oxalic acid solutions as has ' already been published for zinc( 11)ii.
In this study, the distribution coefficients for twelve elements on Dowex x-X8, x00-200 mesh, were determined in oxalic acid medium. The elements investigated were arsenic, cerium, chromium, cobalt, copper, indium, lutetium, manganese, mercury, molybdenum, scandium and zinc. The concentration range of the oxalic acid was chosen from x0-3 to 0.98 M (saturation). The fc'n values allowed the separation of five elements from each other, namely As(II1).
Mn(II), Co(II), Zn(II) and Cll(I1). I3ETERMINATION OF THE DISTRII3UTLO3i COXSTASTS where V =total volume of the column (height x cross-sectional area), ,g =specific volume of the exchanger, and i =void fraction of the column. Small aliquots of so-IOO p1 of the tracer solution containing the ion under T Research associate of the N.F.W.0, ** Research associate of the I. I. K.W.
Arrat.