The co-precipitation of manganese by iron(III) hydroxide
Radioactive manganese and iron were used to study the precipitation of iron(III) and managanese hydroxides at differentpH values from their pure solutions as well as in the presence of each other. It was noticed that there was always some entrainment of mangenese by iron(III) hydroxide even at lowpH values at which the iron itself was incompletely precipitated. The amount of manganese entrained at various concentrations of manganese and iron at the intermediatepH values from 3 to 7 were determined. There is a criticalpH value (i.e. between 4.5 and 4.7) at which there is a change in the course of entrainment from adsorption process to the incorporation phenomena. The effect of aging of the precipitate in its mother liquor to reduce the entrainment was also investigated.
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