A LEAD-SELECTIVE EXTRACTION CHROMATOGRAPHIC RESIN AND ITS APPLICATIONTO THE ISOLATION OF LEAD FROM GEOLOGICAL SAMPLES

A novel extraction chromatographic resin comprised of a 0.75 M solutio n of the macrocyclic polyether bis-4,4'(5')-[tert.-butylcyclohexano]-1 8-crown-6 in isodecanol supported on an inert, polymeric substrate for the separation and preconcentration of lead from acidic media is desc ribed. The material is shown to retain lead efficiently and selectivel y over a wide range of nitric acid concentrations. Sorbed lead is read ily recovered using any of a variety of complexing agents. The resin i s demonstrated to be sufficiently stable to handle large sample volume s or to permit reuse. Application of the resin to the isolation of lea d from geological samples for subsequent mass spectrometric determinat ion of isotopic ratios is described.