Some measurements of calcium oxalate nucleation and growth rates in urine-like liquors

Development of the MSMPR crystallizer for study of CaOx crystallization kinetics was traced from its beginning to current versions having in situ particle size measurements with on-line minicomputer data regression. MSMPR studies of COD crystallization kinetics in a synthetic urine liqour, with or without a component of human urine, were summarized. These results were extended by the data of this study which show the effects of osmolarity, Ox feed concentration, urea and magnesium as they effect COD nucleation and growth rates. Although consistent variations in COD crystallization kinetics were observed with the above variables, such variations (with the exception of Ox in feed) are small compared with effects due to urinary macromolecules.