Original scientific paper

Precipitation and Characterization of Strontium Phosphates

Nevenka Pavković ; Department of Physicai Chemistry, Faculty of Science, University of Zagreb, P.O.B. 163, 41001 Zagreb, Croatia, Yugoslavia
Biserka Kojić-Prodić ; Department of Physicai Chemistry, Faculty of Science, University of Zagreb, P.O.B. 163, 41001 Zagreb, Croatia, Yugoslavia
Milenko Marković ; Department of Physicai Chemistry, Faculty of Science, University of Zagreb, P.O.B. 163, 41001 Zagreb, Croatia, Yugoslavia
Dejan Plavšić ; Department of Physicai Chemistry, Faculty of Science, University of Zagreb, P.O.B. 163, 41001 Zagreb, Croatia, Yugoslavia

Abstract

Spontaneous precipitation of strontium phosphates was studied
over a wide concentration range of strontium chloride (2 · 10-4 --
8 · 10-1 mol dm-3) and of sodium phosphate (4 · 10·4 ·-3 · 10 1
mol dm-3) solutions. In all systems, initial pH was 7.4 and sod\um
chloride concentration w<•.s 0.15 mol dm-3• The precipitates aged
for 1 day and 30 days at 298 K and 310 K were characterized by
light microscopy and X-ray powder diffraction. Solid phases
SrHP04 (a and P modifications), Sr.10 (P04)s (OHh, Ha Sra (P04);; ·
· 2H20, and Na [Sr (H20)u] PQ4 were determined .. According to the
precipitation boundary after 30 days (equilibrium conditions) the
solubility product of Na [Sr (H20)9] P04 is determined as follows:
log ([Na+] [Sr2+] [Po4-3]) = -9.98±0.11 (at I = 0.25 mol dm-3, 298 K).

Keywords

Hrčak ID:

194237

URI

https://hrcak.srce.hr/194237

Publication date:

15.4.1983.

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