Phosphate sorption on the strong basic anion exchanger, Amberlite IRA-400 (OH-form ) bas been studied as a function of pH (3-11), temperature (25°C-50°C ) and in the concentration range 3.874-6.134 mmol./L. The sorption of phospbate increases with increases in temperature and concentration of the solution. However, increases in the pH above 7 leads to a decrease in the sorption of phosphate which is due to the increased competition from hydroxide ions. The data is explained with the help of a modified Langmuir equation. Various thermodynamic parameters (6.G 0 , AH 0 and AS 0 )are calculated. The differential isosteric heat of adsorption,~ , is computed at different temperatures, showing the sorption of phosphate to be endothermic on the anion exchanger Amberlite IRA-400.
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