title: Phosphate/sulphate exchange studies on Amberlite IRA-400.
abstract: The sorption behaviour of phosphate on strong basic anion exchanger, Amberlite IRA-400 (SO4(2-) 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 mmol l(-1)) at 25 degrees C. The stiochiometry of the exchange reactions is observed to be dependent upon concentration and pH of the solutions. It is suggested that the sorption of phosphate takes place initially as PO4(3-) followed by HPO4(2-)/H2PO4(-). The data obtained is explained with the help of a modified Langmuir and mass law action equations.
authors.affiliation: National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan.
authors.forename: S
authors.initials: S
authors.lastname: Mustafa
authors.forename: A
authors.initials: A
authors.lastname: Naeem
authors.forename: N
authors.initials: N
authors.lastname: Rehana
authors.forename: A
authors.initials: A
authors.lastname: Hamid
authors.forename: B
authors.initials: B
authors.lastname: Dilara
mesh_terms: D000327:Adsorption; D007475:Ion Exchange Resins / Q000737:chemistry*; D008962:Models, Theoretical; D010710:Phosphates / Q000737:chemistry*; D011108:Polymers; D013431:Sulfates / Q000737:chemistry*; D014873:Water Pollutants / Q000302:isolation & purification*
chemical_list: D007475:Ion Exchange Resins; D010710:Phosphates; D011108:Polymers; D013431:Sulfates; D014873:Water Pollutants; C050187:amberlite IRA 400