indicated that manganese up to 100 p.p.m. was retained on 25-cm. columns when the HC1 concentration was 10M or higher. Copper and iron were retained on the column under the same conditions.The Mn(II) was eluted by using 25 ml. of 6M HC1. This concentration and volume of acid gave quantitative recovery of manganese from 0 to 100 p.p.m.After Mn(II) was eluted, a 2.5M HC1 solution wras used to elute Cu(II). The volume used was 70 ml.These conditions provided for quantitative removal of Cu(II) with no indication of Fe(III) in the eluate. Trials with 2.00 and 2.25M HC1 were unsuccessful. The concentration and volume of HC1 for this separation are more critical than those used for Mn(II) and Fe(III).After removal of copper, Fe(III) was eluted with 40 ml. of 0.5 HC1. This also was quantitative and successful in the range 0 to 100 p.p.m. In all cases a total of 25 ml. of solution of concentrations up to 100 p.p.m. were placed on the column. Thus, the total maximum amount of any ion on the resin column was 2.5 mg.
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