Phosphate/bromide exchange studies on Amberlite IRA‐400

Abstract

Phosphate sorption on the strong basic anion exchanger Amberlite IRA‐400(Br^‐form)is studied as a function of pH(3–11)at two different initial concentration ranges (0.161–0.807 mmol.L^‐1, 3.874–6.134 amol.L^‐1)at 25°C. The ratio of bromide released/ phosphate sorbed increases with the increase in pH and decreases with the increase in the concentration of the solution. It is suggested that phosphate sorption takes place initially as HPO^2‐ ₄ followed by H₂PO^‐ ₄. The data is exPlained with the help of modified Langmuir and mass law action equations.