Abstract
The amounts of K + and Fe 3+ coprecipitated with barium sulphate are investigated as a function of K + and Fe 3+ concentrations. It is found that log[K +] BaSO 4 = 0.28 log[K +] soln over a concentration range of over 3 orders of magnitude which extends up to 28 mol per cent K + in BaSO 4, with no indication of deviation as concentration increases. Iron, on the other hand, is carried up to about 11 mol per cent, with a clearly indicated maximum. The mutual interference between K + and Fe 3+ is found likewise to differ. The presence of iron in solution markedly depress the coprecipitation of potassium, especially at [Fe] > 10 −3M. Potassium on the other hand, has no effect on the coprecipitation of iron in the BaSO 4. These results clearly indicate that the mechanisms of coprecipitation are different for the two ions, and are in agreement with the conclusion expressed elsewhere that potassium forms a mixed crystal with BaSO 4, while iron is present as a separate phase, either adsorbed or occluded.
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