Effect of Precursor Solution on Sedimentation of Alkaline-earth Phosphates at Different Temperatures

A. Cookey, D. S. Iboroma and N. J. Maduelosi
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A. Cookey: Department of Chemistry, Rivers State University, Port Harcourt, Nigeria
D. S. Iboroma: Pollution Control Department, Rivers State Ministry of Environment, Port Harcourt, Nigeria
N. J. Maduelosi: Department of Chemistry, Rivers State University, Port Harcourt, Nigeria

International Journal of Research and Innovation in Applied Science, 2024, vol. 9, issue 3, 102-109

Abstract: Kinetic study of sedimentation of alkaline-earth phosphates-magnesium phosphate (MP), calcium phosphate (CP), strontium phosphate (SP) and barium phosphate (BP) precipitates was carried out by varying reactant concentration approach involving turn-wise variation of precursor metal ions (Mg2+, Ca2+, Sr2+ and Ba2+) and phosphate ion (PO43-) concentrations, and monitoring the settling of the precipitate formed in a precipitate sedimentation measurement apparatus. A pseudo-rate order equation, associated with the approach of varying reactant concentration, was linearized, and the dependence of precipitate sedimentation on precursor concentration, established therewith. Whereas MP precipitate gave positive order-sedimentation increased with increase in concentrations of precursor solutions, orders of CP, SP and BP precipitates were negative-sedimentation decreased with increase in concentrations of precursor solutions. Inter-particle attraction and repulsion associated with high solid concentration, volume of precipitate particles formed as well as chemical interactions of precipitate with the mother solution might have caused these effects.

Date: 2024
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