Crystal Growth of Calcium Oxalate Monohydrate in Presence of Amino Acids

Abstract

The crystal growth of calcium oxalate monohydrate has been investigated in aqueous solutions at 37 °C by constant composition method. Over a range of super-saturation 1.8-3.0, the calculation of order of reaction from logarithmic plots of growth rate versus super-saturations has been appears to be governed by a surface process. The influence of a number of amino acids on the rate of reaction has been investigated, the order of the degree of inhibition is phenyl alanine > arginine > glycine > alanine. Retardation effect was enhanced with increases in the additive content and as the relative super-saturation decreases. Application to a kinetic Langmuir-type model suggests that adsorption of the amino acids at the active growth sites is the cause of the reduction in the growth rates.