Abstract
Acid gradient elution technique was used at three stages with low, medium and high acid concentrations (N/10, 5 N and 10 N HCl) successively to dissolve phosphorus components of varying solubility. Chittor soil and sand each mixed with tricalcium phosphate and ferrous phosphate were eluted by this technique. It has been possible to roughly demarcate the peaks of Al, Fe and Ca bound phosphates in the gradient elution curves.
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