The adsorbability of Pb(II) and Bi(III) from hydrochloric acid (0.25 to 12 M HC1), nitric acid (0.5 to 10 M HNOs) and ammonium nitrate (1 to 10 M) solutions was studied with a strong base quaternary amine anion-exchange resin. Lead was weakly adsorbed at low HC1 concentrations (distribution coefficient D = 1 in 0.05 M HC1), reached maximum adsorption (D = ca. 25) near 1 to 2 M HC1, and then showed decreasing adsorption at higher HC1 concenti ations. Bi( III J adsorbed strongly throughout the HC1 concentration range studied; D decreased with increasing HC1 concentration from 2 X 105 (0.25 M HC1) to 60 (12 M HC1). Both lead and bismuth showed some adsorption in HNOs solutions, although this adsorption was^considerably smaller than in HC1 solutions. In NH4N03 solutions adsorption of lead remained low but for bismuth it increased to D = ca. 200 in 10 M NHiNOs. Typical separations involving Pb(II) and Bi(III) in these media are illustrated.