Synthesis and mineralogical characteristics of hydroxylapatite-hydroxylpyromorphite solid solution series Ca5(PO4)3OH–Pb5(PO4)3OH

Motyka, Joanna; Oknińska, Joanna; Manecki, Maciej

doi:10.7494/geol.2015.41.1.112

geol

2015

DOI: 10.7494/geol.2015.41.1.112

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Synthesis and mineralogical characteristics of hydroxylapatite-hydroxylpyromorphite solid solution series Ca5(PO4)3OH–Pb5(PO4)3OH

Joanna Motyka¹,

Joanna Oknińska²,

Maciej Manecki³

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“…The system was considered in Hydroxylapatites are important biomaterials. Substitutions of Pb for Ca and As for P in hydroxylapatites are recently intensively studied due to their significance in the environmental immobilization of Pb and As (Lee et al 2009, Chlebowska et al 2015, Motyka et al 2015. The general chemical formula of minerals in the apatite group is expressed by A 5 (XO 4 ) 3 Z, where A are bivalent cations (e.g., Ca 2+ or Pb 2+ , cations are distributed on two distinct crystallographic sites), XO 4 is a trivalent oxyanion (e.g., PO 4 3-, AsO 4 3-), and Z is a monovalent anion (OH, F, Cl, or O).…”

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confidence: 99%

The effect of Ca-Pb and P-As substitutions on the solubulity of hydroxylapatites [abstract].

Młynarska¹,

Puzio²,

Kwaśniak-Kominek³

et al. 2016

geol

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CC-BY 4.0 License requiring that the original work has been properly cited.-HAP hydroxyapatite Ca 5 (PO 4 ) 3 OH -JBM johnbaumite Ca 5 (AsO 4 ) 3 OH. The phases were synthesized from aqueous solutions at high pH above 8, at ambient temperature, by dropwise mixing of chemical reagents. The products are white, fine, homogeneous crystalline powders. Chemical composition determined by SEM/EDS is close to theoretical. X-ray diffraction confirms their crystalline structure and systematic changes in unit cell parameters with ionic substitution. Dissolution experiments were run in thermostatic bath at 25°C. An aliquot of 0.5 g of apatite was dissolved in 250 mL of 0.05M NH 4 NO 3 background solution at pH in the range of 3.5-5.0. Background solution was used to keep the ionic strength constant. The dissolution was carried out for 3 months. The bottles were manually stirred at least two times a week. The solution was syringe-sampled periodically and filtered through 0.2 μm polycarbonate filter to remove the suspended solids. The concentration of Pb and Ca was determined by atomic absorption spectroscopy. The concentration of dissolved phosphates and arsenates was determined by UV-vis colorimetry using a molybdenum blue method. The plateau on concentration evolution patterns from the dissolution experiments was observed to determine equilibrium in the suspensions.Dissolution of all the phases at the conditions of these experiments is incongruent. An increase in solution pH resulting from dissolution was observed in all cases. The system was considered in Hydroxylapatites are important biomaterials. Substitutions of Pb for Ca and As for P in hydroxylapatites are recently intensively studied due to their significance in the environmental immobilization of Pb and As (Lee et al. 2009, Chlebowska et al. 2015, Motyka et al. 2015. The general chemical formula of minerals in the apatite group is expressed by A 5 (XO 4 ) 3 Z, where A are bivalent cations (e.g., Ca 2+ or Pb 2+ , cations are distributed on two distinct crystallographic sites), XO 4 is a trivalent oxyanion (e.g., PO 4 3-, AsO 4 3-), and Z is a monovalent anion (OH, F, Cl, or O). Positions Z and X may be partly filled with carbonate CO 3 2− . The structure of hydroxylapatite allows for unlimited substitutions of Pb 2+ for Ca 2+ and AsO 4 3− for PO 4 3− . The ability of lead and arsenic apatites to immobilize these toxic elements result from their high durability and low solubility at the conditions on the Earth surface. Various apatites possess different thermodynamic properties including different solubility in aqueous solutions but the systematic variation of these properties in solid solution series is poorly understood.The main objective of this research is determination of systematic variation in the solubilities of hydroxylapatites resulting from cationic substitutions of Pb 2+ for Ca 2+

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mentioning

confidence: 99%

The effect of Ca-Pb and P-As substitutions on the solubulity of hydroxylapatites [abstract].

Młynarska¹,

Puzio²,

Kwaśniak-Kominek³

et al. 2016

geol

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Synthesis and mineralogical characteristics of hydroxylapatite-hydroxylpyromorphite solid solution series Ca5(PO4)3OH–Pb5(PO4)3OH

Cited by 1 publication

References 3 publications

The effect of Ca-Pb and P-As substitutions on the solubulity of hydroxylapatites [abstract].

The effect of Ca-Pb and P-As substitutions on the solubulity of hydroxylapatites [abstract].

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