Physicochemical Studies on Solid Solutions of Calcium Phosphorus Arsenic Hydroxyapatites

Mahapatra, P. P.; Mahapatra, L. M.; Mishra, Braja Kishori

doi:10.1246/bcsj.62.3272

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…Apatite series compound synthesis followed a modified Mahapatra et al [15] procedure. For synthesis of hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , arsenate phosphate hydroxyapatite, Ca 10 (As x P y O 4 ) 6 (OH) 2 , with variable phosphate to arsenate ratios, and Johnbaumite, Ca 10 (AsO 4 ) 6 (OH) 2 , calcium, phosphate and arsenate were combined maintaining the Ca:(As+P) molar ratio at 5:3.Solution pH was adjusted to 11.0 using NaOH and the temperature held at 100 °C for 24 hours.…”

Section: Methodsmentioning

confidence: 99%

“…Hydroxyapatites (Ca 10 (PO 4 ) 6 (OH) 2 ) are a group of minerals with similar crystal structure but varying in exact composition. They are stable over a broad pH range and arsenate may substitute for phosphate in hydroxyapatite to form Johnbaumite (Ca 10 (AsO 4 )6(OH) 2 ) [15,16]. Hydroxyapatite minerals have been studied for the immobilization of hazardous compounds containing lead, cadmium, nickel, copper, mercury and arsenic [17–20].…”

Section: Introductionmentioning

confidence: 99%

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Scoping candidate minerals for stabilization of arsenic-bearing solid residuals

Raghav

Shan

Sáez

et al. 2013

Journal of Hazardous Materials

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Arsenic Crystallization Technology (ACT) is a potentially eco-friendly, effective technology for stabilization of arsenic-bearing solid residuals (ABSRs). The strategy is to convert ABSRs generated by water treatment facilities into minerals with a high arsenic capacity and long-term stability in mature, municipal solid waste landfills. Candidate minerals considered in this study include scorodite, arsenate hydroxyapatites, ferrous arsenates (symplesite-type minerals), tooeleite, and arsenated-schwertmannite. These minerals were evaluated as to ease of synthesis, applicability to use of iron-based ABSRs as a starting material, and arsenic leachability. The Toxicity Characteristic Leaching Procedure (TCLP) was used for preliminary assessment of candidate mineral leaching. Minerals that passed the TCLP and whose synthesis route was promising were subjected to a more aggressive leaching test using a simulated landfill leachate (SLL) solution. Scorodite and arsenate hydroxyapatites were not considered further because their synthesis conditions were not found to be favorable for general application. Tooeleite and silica-amended tooeleite showed high TCLP arsenic leaching and were also not investigated further. The synthesis process and leaching of ferrous arsenate and arsenated-schwertmannite were promising and of these, arsenated-schwertmannite was most stable during SLL testing. The latter two candidate minerals warrant synthesis optimization and more extensive testing.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scoping candidate minerals for stabilization of arsenic-bearing solid residuals

Raghav

Shan

Sáez

et al. 2013

Journal of Hazardous Materials

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ChemInform Abstract: Physicochemical Studies on Solid Solutions of Calcium Phosphorus Arsenic Hydroxyapatites

Mahapatra¹,

Mahapatra²,

Mishra³

1990

ChemInform

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The prediction method for standard enthalpies of apatites using the molar volume, lattice energy, and linear correlations from existing experimental data

Puzio

Manecki

2022

Contrib Mineral Petrol

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Experimental data of thermodynamic state functions and molar volume for phosphate, arsenate, and vanadate apatites containing Ca, Sr, Ba, Pb, end Cd at the cationic positions Me2+ and F, OH, Cl, Br, and I at the halide position X were collected. The apatite supergroup splits into distinct subgroups (populations) constituted by Me10(AO4)6X2 with the same Me2+ cations and tetrahedral AO43− anions but with different anions at the X position. Linear relationships between various parameters within apatite subgroups are observed. The prediction method for standard enthalpies of apatites (ΔHºf,el) is based on regression analysis of the linear correlations within the subgroups between ΔH°f,el of apatites and their molar volume Vm, lattice energy UPOT, and ΔH°f,el of their anions AO43− or X−. This allowed to predict 22 new ΔH°f,el values for apatites and materials with an apatite structure. The prediction precision is comparable to the experimental uncertainty obtained when reproducing experimental data using calorimetric measurements or dissolution experiments and can be applied to a wider range of apatites than other methods.

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Physicochemical Studies on Solid Solutions of Calcium Phosphorus Arsenic Hydroxyapatites

Cited by 9 publications

References 6 publications

Scoping candidate minerals for stabilization of arsenic-bearing solid residuals

Scoping candidate minerals for stabilization of arsenic-bearing solid residuals

ChemInform Abstract: Physicochemical Studies on Solid Solutions of Calcium Phosphorus Arsenic Hydroxyapatites

The prediction method for standard enthalpies of apatites using the molar volume, lattice energy, and linear correlations from existing experimental data

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