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Inhibition of Calcium Oxalate Monohydrate Crystal Growth in High and Low Ionic Strength Solutions
Author(s) -
Millan A.,
Pavelkova M.,
Sohnel O.,
Grases F.
Publication year - 1998
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(1998)33:5<777::aid-crat777>3.0.co;2-1
Subject(s) - supersaturation , chemistry , ionic strength , kinetics , oxalate , crystal growth , reaction rate constant , inorganic chemistry , crystal (programming language) , growth rate , crystallography , aqueous solution , organic chemistry , physics , geometry , mathematics , quantum mechanics , computer science , programming language
The effect of additives on the kinetics of growth of calcium oxalate monohydrate crystals has been studied. Conductivity and potentiometry measurements have been compared. Growth rates were calculated from precipitate curves by a cubic spline method. An approach consisting on the calculation of rate constants and orders of reaction from logarithmic plots of growth rate versus supersaturation has been followed to study crystal growth kinetics. This method revealed that the presence of additives is causing not only a decrease on the rate constant but an increase on the order of reaction as well. The effect of additives (EDTA, citrate and phytate) was considerably weaker in high ionic strength media. Phytate produced a complete blockage of crystal growth in concentrations as low as 2 × 10 —6 mole/L in both methods.