Nouvelle methode de separation calcium-strontium appliquee a la preparation d'un sel de calcium de tres faible teneur en strontium

Patti, F.; Hernández, Juan Carlos López

doi:10.1016/s0003-2670(01)82384-9

Cited by 5 publications

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“…The separation of calcium from strontium has been shown to be possible by hydroxide precipitation of calcium from a strontium-containing solution. ,, This method of separation is successful due to the differential solubility of calcium and strontium hydroxide . The method is quite simple, requiring only that an aqueous Ca 2+ solution be treated with OH – to precipitate Ca(OH) 2 .…”

Section: Resultsmentioning

confidence: 99%

“…36,39,40 This method of separation is successful due to the differential solubility of calcium and strontium hydroxide. 36 The method is quite simple, requiring only that an aqueous Ca 2+ solution be treated with OH − to precipitate Ca(OH) 2 . The separation of the two elements by this route is sensitive to the number of equivalents of OH − used for the precipitation, with a higher efficiency of purification being achieved by using only a small number of equivalents of OH − resulting in an excess of free Ca 2+ in the solution (Figure 1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Low strontium Ca(OH) 2 was prepared via a method similar to that described by Patti and Hernandez . A 2 mol/dm 3 aqueous solution of Ca 2+ was prepared from CaCl 2 ·2H 2 O.…”

Section: Methodsmentioning

confidence: 99%

“…These reagents included calcium chloride dihydrate (CaCl Low strontium Ca(OH) 2 was prepared via a method similar to that described by Patti and Hernandez. 36 A 2 mol/dm 3 aqueous solution of Ca 2+ was prepared from CaCl 2 •2H 2 O. An aqueous solution of NaOH, made to the appropriate concentration, was then added to the Ca 2+ solution to precipitate Ca(OH) 2 .…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Pure Hydroxyapatite Phantoms for the Calibration of in Vivo X-ray Fluorescence Systems of Bone Lead and Strontium Quantification

et al. 2013

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Plaster of Paris [poP, CaSO4·(1)/(2) H2O] is the standard phantom material used for the calibration of in vivo X-ray fluorescence (IVXRF)-based systems of bone metal quantification (i.e bone strontium and lead). Calibration of IVXRF systems of bone metal quantification employs the use of a coherent normalization procedure which requires the application of a coherent correction factor (CCF) to the data, calculated as the ratio of the relativistic form factors of the phantom material and bone mineral. Various issues have been raised as to the suitability of poP for the calibration of IVXRF systems of bone metal quantification which include its chemical purity and its chemical difference from bone mineral (a calcium phosphate). This work describes the preparation of a chemically pure hydroxyapatite phantom material, of known composition and stoichiometry, proposed for the purpose of calibrating IVXRF systems of bone strontium and lead quantification as a replacement for poP. The issue with contamination by the analyte was resolved by preparing pure Ca(OH)2 by hydroxide precipitation, which was found to bring strontium and lead levels to <0.7 and <0.3 μg/g Ca, respectively. HAp phantoms were prepared from known quantities of chemically pure Ca(OH)2, CaHPO4·2H2O prepared from pure Ca(OH)2, the analyte, and a HPO4(2-) containing setting solution. The final crystal structure of the material was found to be similar to that of the bone mineral component of NIST SRM 1486 (bone meal), as determined by powder X-ray diffraction spectrometry.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Low strontium Ca(OH) 2 was prepared via a method similar to that described by Patti and Hernandez . A 2 mol/dm 3 aqueous solution of Ca 2+ was prepared from CaCl 2 ·2H 2 O.…”

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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