CALCIUM-OXALATE CRYSTALLIZATION KINETICS FROM CALORIMETRIC MEASUREMENTS

The kinetics of calcium oxalate monohydrate precipitation effected by mixing aqueous solutions of calcium chloride and sodium oxalate togeth er in the stoichiometric ratio at 25 and 37 degrees C, were studied us ing an isoperibolic reaction twin calorimeter. A method for inferring the crystal growth kinetic parameters from experimental progress curve giving the time development of the integral heat evolved during the p recipitation is suggested and verified. Results obtained for calcium o xalate monohydrate compare favourably with those obtained with convent ional techniques for studying crystallization. (C) 1997 Elsevier Scien ce B.V.