1986
DOI: 10.1016/0022-0248(86)90205-8
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The initial phases of calcium and magnesium phosphates precipitated from solutions of high to medium concentrations

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Cited by 117 publications
(88 citation statements)
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“…It can be observed that the precipitate is composed of a mixture of hydroxyapatite [hydroxide calcium phosphate, Ca5(PO4)3(OH)] and a calcium-deficient hydroxyapatite [hydroxide calcium hydrogen phosphate Ca9HPO4(PO4)5OH] which is a non-stoichiometric hydroxyapatite. According to some authors (Abbona et al, 1986;Musvoto et al, 2000;Liu et al, 2009), hydroxyapatite precipitation starts at pH> 5; however, the precipitation reaction kinetics is not favored and other species, such as amorphous calcium phosphate, octacalcium phosphate and brushite, act as precursors of the hydroxyapatite precipitation. Gray and Schwab (1993) reported that calcium phosphate precipitation is almost complete at pH values higher than 9.8.…”
Section: Precipitate Characterizationmentioning
confidence: 99%
“…It can be observed that the precipitate is composed of a mixture of hydroxyapatite [hydroxide calcium phosphate, Ca5(PO4)3(OH)] and a calcium-deficient hydroxyapatite [hydroxide calcium hydrogen phosphate Ca9HPO4(PO4)5OH] which is a non-stoichiometric hydroxyapatite. According to some authors (Abbona et al, 1986;Musvoto et al, 2000;Liu et al, 2009), hydroxyapatite precipitation starts at pH> 5; however, the precipitation reaction kinetics is not favored and other species, such as amorphous calcium phosphate, octacalcium phosphate and brushite, act as precursors of the hydroxyapatite precipitation. Gray and Schwab (1993) reported that calcium phosphate precipitation is almost complete at pH values higher than 9.8.…”
Section: Precipitate Characterizationmentioning
confidence: 99%
“…Of interest to biological cements, magnesium can stabilize amorphous calcium phosphate against phase transformation (Termine et al 1970), promote the formation of whitlockite (Mg-substituted tricalcium phosphate; Rowles 1968) and inhibit the transformation of brushite to octacalcium phosphate and HAP (Bigi et al 1988). Previous studies of the effects of magnesium on the growth of brushite have found that magnesium acts as a growth inhibitor but it also stabilizes brushite against dissolution up to neutral pH (Abbona et al 1986;Abbona & Franchini-Angela 1990).…”
Section: (I) the Impact Of Magnesium On Brushite Growthmentioning
confidence: 99%
“…Pour des pH supérieurs à 8,3, la couche dense sorbée à l'interface entre les suspensoïdes de Figure 4-3 Effet du pH sur la charge de surface des suspensoïdes dans les eaux naturelles (Stumm et Morgan, 1981 (Moutin et al, 1992). La précipitation est contrôlée par le pH, la concentration de calcium et la concentration de phosphate,etc... (Larsen, 1986;Abbona et al, 1986 Dans des conditions alcalines (pH égal ou supérieur à 8,0), où la forme dominante des phosphates est HPO 4 , la calcite peut aussi se transformer en hydroxyapatite. Cette hypothèse est supportée par les travaux de Leckie et Stumm (1972).…”
Section: -3 Mécanismes De La Fixation Des Phosphates Sur Les Biofilsunclassified
“…Ce résultat s'explique par la présence d'ions de magnésium, qui n'interfèrent pas dans la formation de la phase amorphe mais retardent ou inhibent complètement la conversion à la phase cristalline (Abbona et al, 1986). Pour la brushite et le phosphate d'octocalcium, la solubilité prédite est différente des valeurs mesurées à pH élevé.…”
Section: -3 Mécanismes De La Fixation Des Phosphates Sur Les Biofilsunclassified
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