Spontaneous supersaturation of calcium citrate from simultaneous isothermal dissolution of sodium citrate and sparingly soluble calcium hydroxycarboxylates in water

Abstract

Strongly supersaturated homogeneous calcium citrate solutions are formed spontaneously when solid sodium citrate and solid calcium hydroxycarboxylates are dissolved simultaneously in water.

Comparison of Oxalate, Citrate and Tartrate Ions Adsorption in the Hydroxyapatite/Aqueous Electrolyte Solution System

“…The surface charge density and zeta potential were measured for the 0.001 mol/dm 3 NaCl solutions as a function of pH and concentration of the oxalate anions ranged from 0.000001 to 0.001 mol/dm 3 . The adsorption of oxalate, citrate and tartrate ions was estimated from the concentration of ions from solutions that was determined by the radioisotopic method using labeled 14 C of oxalic acid, citric acid and tartaric acid, respectively.…”

“…In this paper, the comparison of the kinetic and static adsorption of oxalate, citrate and tartrate ions on hydroxyapatite was investigated using the 14 C radiolabeled acids from acid solutions of initial concentrations of 0.000001 and 0.001 mol/dm 3 and pH range from 6 to 11. The adsorption measurements were complemented by the spectrometric, potentiometric titration of HAp suspensions and electrophoretic measurements.…”

Preparation of Al2O3@CaCO3 aggregates and its effects on the thermal shock resistance of Al2O3‐MgO castables

“…To characterize the phase composition of precursor solution, the corresponding XRD patterns of samples were exhibited in Figure 1. According to Figure 1 and Equations (), the main phases in precursor solutions are CaHC 6 H 5 O 7 and C 6 H 8 O 7 28–31 . Meanwhile, when the concentration of Ca 2+ was 0.35 mol L −1 in the precursor solutions, a small amount of the phases of Ca(H 2 C 6 H 5 O 7 ) 2 were exhibited in Figure 1 due to the high concentration of C 6 H 8 O 7 .…”

“…The results show that the degree of agglomeration of CaCO 3 increases as the concentration of Ca 2+ in the solution increasing owing to the increasement of the amount of carboxyl functional groups (‐COOH) adsorbed on the surface of Ca 2+ increases. Furthermore, the viscosity of the solution increases, the adsorption of Ca 2+ and carboxyl functional groups are enhanced, thus, it is prone to agglomerate 31,32 …”

“…Furthermore, the viscosity of the solution increases, the adsorption of Ca 2+ and carboxyl functional groups are enhanced, thus, it is prone to agglomerate. 31,32 According to Table 3, the water absorption rates primordially decreased and finally increased. Meanwhile, the mass change rates (∆m) of the Al 2 O 3 @CaCO 3 aggregates increased with the concentration of Ca 2+ increases gradually.…”