Metathesis of sodium phosphate and calcium nitrate
Low intensity Ca peaks are also observed in the product spectra, consistent with incomplete coverage of the CaHAp growth substrate. The XRD pattern of the product after 48 h reflux clearly shows the PbHAp phase as the major product phase with the intensity of PbHAp peaks considerably increased, indicating. The inset shows the locations sampled for the spectra. PbHAp crystal product is present as hexagonal rod-shaped.
The presence ofboth phases results from difficulty separating the finely divided PbHAp phase from the approximately fold excess CaHAp reactant substrate phase. The CaHAp reactant material was not calcined and shows broad water O-H stretching vibrational bands centered about cm-1 in the CaHAp spectrum with the rOH apatite band as a shoulder at cm-1, similar to reported values of  and cm-1 .
A small sharp O-H stretching mode appears at cm-1 in the product spectra, which compares favorably with the apatite bands and the reported  rOH vibrational stretching band for pure PbHAp at cm A broad band in the cm-1 region and a weak. As all the IR spectroscopy samples were prepared in the same manner, loss of these broad peaks on refluxing indicates that they are due to water associated with the reactant substrate phase. The carbonate may come from the incorporation of atmospheric CO2 through equilibrium with the alkaline reaction solution during the synthesis step.
The reflux method of CaHAp dissolution to provide phosphate anion in the presence of lead cation succeeds for producing larger sized crystals of the less soluble PbHAp from the aqueous solution. Hexagonal rod-shaped crystals of PbHAp formed and product crystal size increased with increasing reflux-reaction time. IR results indicate the incorporation of carbonate in the CaHAp substrate resulting in increased solubility of this material, but the carbonate anion does not appear to carry over into the PbHAp product crystals.
The authors declare that there is no conflict of interests regarding the publication of this paper. Moriguchil, S.
Nakagawa, and F. Kaji, "Reaction of Ca-defi-cient hydroxyapatite with heavy metal ions along with metal substitution," Phosphorus Research Bulletin, vol. Yasukawa, T. Yokoyama, K. Kandori, and T. Ren, Y. Leng, R. Xin, and X.
US2609271A - Production of calcium phosphates and calcium nitrate - Google Patents
Ge, "Synthesis, characterization and ab initio simulation of magnesium-substituted hydroxyapatite," Acta Biomaterialia, vol. O'Donnell, Y. Fredholm, A. Hill, "Structural analysis of a series of strontium-substituted apatites," Acta Biomaterialia, vol. Xu, L. Yang, P. Wang, Y. Liu, and M.
Peng, "Removal mechanism of aqueous lead by a novel eco-material: carbonate hydroxyapatite," Journal of Materials Science and Technology, vol. Dong, T. White, B. Wei, and K.
Net Ionic Equations answers - Mrs. Norquist's Chemistry
Laursen, "Model apatite systems for the stabilization of toxic metals: I, calcium lead vanadate," Journal of the American Ceramic Society, vol. Dai and M. Hughes, "Crystal structure refinements of vanadinite and pyromorphite," Canadian Mineralogist, vol. Dungkaew, K. Haller, A. Flood, and J. Scamehorn, "Arsenic removal by precipitation with Calcium phosphate hydroxyapatite," Advanced Materials Research, vol.
Sutovic, J. Stojanovic, and L. Bruckner, G. Lusvardi, L. Menabue, and M. Saladini, "Crystal structure of lead hydroxyapatite from powder X-ray diffraction data," Inorganica Chimica Acta, vol. Kim, R. Fenton, B. Hunter, and B. Kennedy, "Powder diffraction studies of synthetic calcium and lead apatites," Australian Journal of Chemistry, vol. Valsami-Jones, K. Ragnarsdottir, A.
Putnis, D. Bosbach, A. Kemp, and G. Cressey, "The dissolution of apatite in the presence of aqueous metal cations at pH ," Chemical Geology, vol. Hamilton and E. O'Flaherty, "Influence of lead on mineralization during bone growth," Fundamental and Applied Toxicology, vol. Gruber, H. Gonick, F. Khalil-Manesh et al. Parkhurst and C.
Department of the Interior and U. Zhu, X. Zhang, Y. Chen et al. Mavropoulos, A.
Rossi, A. Costa, C. Perez, J. Moreira, and M. Mavropoulos, N. Rocha, J. Moreira, A.
Pre-laboratory Assignment: Types of Reactions
Rossi, and G. Soares, "Characterization of phase evolution during lead immobilization by synthetic hydroxyapatite," Materials Characterization, vol. CNC en. Technique for producing sodium nitrate by chilisaltpeter adverse current circulation leaching. CZA3 en. Process for preparing potassium nitrate by employing electrodialysis method and apparatus for making the same ya.
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A method of preparing a co-production of ammonium chloride and potassium sulfate. CNA en. USA en.
Nano-filtration method for separating magnesium and enriching lithium from salt lake brine. CAA en. CAA1 en. Method for producing technical grade ribose phosphate, food grade ribose phosphate and industry ammonium diacid phosphate using wet-process ribose phosphate. Method for combined extracting boron, magnesium and lithium from salt lake bittern. Method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in coking plant.