PRECIPITATION OF CALCIUM-OXALATE AND CALCIUM-PHOSPHATE IN THE PRESENCE OF URIC-ACID

Authors
SIKIRIC M BABICIVANCIC V TONKOVIC M
Citation
M. Sikiric et al., PRECIPITATION OF CALCIUM-OXALATE AND CALCIUM-PHOSPHATE IN THE PRESENCE OF URIC-ACID, Colloids and surfaces. A, Physicochemical and engineering aspects, 121(2-3), 1997, pp. 145-150
Citations number
20
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
121
Issue
2-3
Year of publication
1997
Pages
145 - 150
Database
ISI
SICI code
0927-7757(1997)121:2-3<145:POCACI>2.0.ZU;2-8
Abstract
The influence of uric acid on the precipitation of calcium oxalate and calcium phosphate from electrolyte solutions with pH(i) 6.5, ionic st rength 0.3 mol dm(-3) and temperature 370 K, mimicking urinary conditi ons, has been investigated. The initial concentrations of precipitatio n components in the system were as follows: c(CaCl2) = 5 x 10(-3)-1 x 10(-1) mol dm(-3), c(H(2)Ox) = 3 x 10(-4)-5 x 10(-4) mol dm(-3); c(H2U ) = 1.5 x 10(-4)-6 x 10(-3) mol dm(-3), and c(H3PO4) = 2.5 x 10(-2) mo l dm(-3). Precipitates of calcium oxalate monohydrate, calcium hydroge nphosphate dihydrate, tri calcium phosphate trihydrate and sodium hydr ogenurate monohydrate were characterized by X-ray diffraction, FTIR sp ectroscopy, and chemical and thermogravimetric analyses. (C) 1997 Else vier Science B.V.