Influence of calcium/sulfate molar ratio on the growth rate of calcium sulfate dihydrate at constant supersaturation
1992; Elsevier BV; Volume: 118; Issue: 3-4 Linguagem: Inglês
10.1016/0022-0248(92)90073-r
ISSN1873-5002
AutoresJingwu Zhang, George H. Nancollas,
Tópico(s)Crystallization and Solubility Studies
ResumoThe growth kinetics of calcium sulfate dihydrate (CSD) has been investigated using the constant composition method over a range of calcium/sulfate molar ratios, r, in supersaturated solutions (0.17<r<5.0, at ionic strength, I=0.500m with potassium chloride as the supporting electrolyte and 0.08<r<10.0 at I=1.00m in sodium chloride medium). In spite of constancy of ion activity product, the rate increases with decreasing Ca/SO4 molar ratio, indicating that the rate of crystal growth is not merely a function of the thermodynamic driving forces but also depends upon the relative concentrations and characteristics of individual lattice ions.
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