Journal
UROLITHIASIS
Volume 46, Issue 3, Pages 243-256Publisher
SPRINGER
DOI: 10.1007/s00240-017-0991-0
Keywords
Calcium oxalate monohydrate; Calcium oxalate dihydrate; Calcium oxalate trihydrate; Citrate; Temperature; Stirring
Categories
Funding
- Department of Chemistry, University of Osijek, Croatia
- Laboratory for Precipitation Processes, Ruder Boskovic Institute, Zagreb, Croatia
Ask authors/readers for more resources
This paper reports on the investigation of experimental conditions relevant for spontaneous precipitation of significant amount of pure calcium oxalate dihydrate (COD). For this purpose, the hydrodynamic and thermodynamic parameters, such as mode of agitation, temperature, supersaturation and concentration of additives (citrate ions), have been studied. The results show that in the model systems, without the citrate addition and applied mechanical stirring, calcium oxalate monohydrate (COM) was observed as dominant modification after 20 min of aging, while the magnetic stirring resulted in a formation of a mixture of COM and calcium oxalate trihydrate (COT), regardless of the temperature applied. In the mechanically stirred systems, the addition of citrate ions in the range of concentrations, 0.001 mol dm(-3) < c(i)(Na3C6H5O7) < 0.012 mol dm(-3), caused the formation of COM and COD mixture at all temperatures. At the same conditions and in the magnetically stirred systems formation of COD, in a mixture with COT or COM, has been observed. The highest COD content in the mechanically stirred system was obtained at 45 degrees C and c(i)(Na3C6H5O7) = 0.001 mol dm(-3) (w = 89.5%), while in the magnetically stirred system almost pure COD was obtained at 37 degrees C and c(i)(Na3C6H5O7) = 0.008 mol dm(-3) (w = 96.5%).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available