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Precipitation of calcium oxalate and calcium phosphate in the presence of uric acid

Authors
Journal
Colloids and Surfaces A Physicochemical and Engineering Aspects
0927-7757
Publisher
Elsevier
Publication Date
Volume
121
Identifiers
DOI: 10.1016/s0927-7757(96)03973-8
Keywords
  • Calcium Oxalate
  • Calcium Phosphate
  • Precipitation
  • Uric Acid
Disciplines
  • Chemistry
  • Earth Science

Abstract

Abstract The influence of uric acid on the precipitation of calcium oxalate and calcium phosphate from electrolyte solutions with pH i 6.5, ionic strength 0.3 mol dm −3 and temperature 370 K, mimicking urinary conditions, has been investigated. The initial concentrations of precipitation components in the system were as follows: c(CaCl 2) = 5 × 10 −3–1 × 10 −1 mol dm −3, c(H 2Ox) = 3 × 10 −4–5 × 10 −4 mol dm −3; c(H 2U) = 1.5 × 10 −4–6 × 10 −3 mol dm −3, and c(H 3PO 4) = 2.5 × 10 −2 mol dm −3. Precipitates of calcium oxalate monohydrate, calcium hydrogenphosphate dihydrate, tri calcium phosphate trihydrate and sodium hydrogenurate monohydrate were characterized by X-ray diffraction, FTIR spectroscopy, and chemical and thermogravimetric analyses.

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