The sorption of cobalt ions on amorphous ferric
hydroxide was studied as a function of pH, temperature
and composition of the solution. To investigate
the effect of pH on the uptake of Co 2 + ions,
experiments were done in the range 5-8, since
ferric hydroxide starts to precipitate at pH 5 and
cobalt hydroxide at pH 8. The effect of pH was
studied in both systems: coprecipitation and sorption.
In both cases, it was found that the uptake