Cation exchange distribution coefficients with Bio-Rad AG 50W-X8, a sulfonated polystyrene cross-linked with divinyl benzene are presented for 54 cations in hydrochloric acid-acetone media, covering the acid concentration range 0.1 to 3.OM and the acetone concentration range 0 to 95%. The elements are arbitrarily arranged in tables according to their coefficients in aqueous hydrochloric acid. A number of the possibilities of this system for separations are pointed out and some aspects of the elution behavior of various elements are discussed. The versatility of hydrochloric acidacetone mixtures as eluting agent for cation exchange separations is demonstrated by sequential elution of the mixtures TI(III), In, Ga, AI, Yb; Cd, Zn, Fe(lll), Cu(ll), Co(ll), Mn(ll); and V(V), Fe(lll), U(VI), Ti(IV), Ca, Ba.
Ion exchange chromatography is extremely well suited for the complete or partial separation of trace and ultra‐trace elements from rooks and minerals. Selective methods are described for the separation of traces of lithium, beryllium, vanadium, uranium, strontium, barium, sodium, potassium and rare earth elements, and their determination in rook samples. The methods are especially useful for accurate standardization work. Some typical elution curves and results for the concentration of these trace elements in the six South African NIM‐rock standards and some international standard rocks are presented.
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