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    Quantification of anions and cations from ternary phosphate based glasses with fixed 50 and 55 mol% P2O5 using ion chromatography

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    The aim of this paper was to characterise the dissolution and release profiles for a range of compositions based on the formula 50P(2)O(5)-50(xCaO-Na2O), and 55P(2)O(5)-45(xCaO-Na2O) where x=30, 35 and 40 mol%, in particular to fully investigate the phosphate anions released from these glasses using ion chromatography analysis. A decrease in dissolution rates with increasing CaO content was observed from these glasses. This decrease was attributed to the Ca2+ ions acting as chelates, crosslinking the phosphate chains, and also to an increase in the ionic strength of the solution. An inhibition of the dissolution rates was also caused by the solution becoming saturated with insoluble species (i.e. higher polyphosphate rings/chains). The sodium ion release data correlated with that seen for the dissolution rates for glasses with fixed 50 mol% P2O5 content, whereas, for compositions with fixed 55 mol% P2O5, increasing Ca2+ ion release was seen with an increase in CaO content. The proposed mode of dissolution for the glasses investigated was the hydration model suggested by Bunker et al. Higher phosphate species were observed in the chromatograms obtained, and according to a method proposed by Stover et al they were quantified using a response factor. Initial analysis using the response factor also showed a decrease in their rates of release, with increasing CaO content.

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    Description

    Title : Quantification of anions and cations from ternary phosphate based glasses with fixed 50 and 55 mol% P2O5 using ion chromatography
    Author(s) : I Ahmed, MP Lewis, JC Knowles
    Abstract : The aim of this paper was to characterise the dissolution and release profiles for a range of compositions based on the formula 50P(2)O(5)-50(xCaO-Na2O), and 55P(2)O(5)-45(xCaO-Na2O) where x=30, 35 and 40 mol%, in particular to fully investigate the phosphate anions released from these glasses using ion chromatography analysis. A decrease in dissolution rates with increasing CaO content was observed from these glasses. This decrease was attributed to the Ca2+ ions acting as chelates, crosslinking the phosphate chains, and also to an increase in the ionic strength of the solution. An inhibition of the dissolution rates was also caused by the solution becoming saturated with insoluble species (i.e. higher polyphosphate rings/chains). The sodium ion release data correlated with that seen for the dissolution rates for glasses with fixed 50 mol% P2O5 content, whereas, for compositions with fixed 55 mol% P2O5, increasing Ca2+ ion release was seen with an increase in CaO content. The proposed mode of dissolution for the glasses investigated was the hydration model suggested by Bunker et al. Higher phosphate species were observed in the chromatograms obtained, and according to a method proposed by Stover et al they were quantified using a response factor. Initial analysis using the response factor also showed a decrease in their rates of release, with increasing CaO content.
    Keywords : biomat, december, fixed, glass, glasses, ion chromatography, ortho, phosphate

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2005

    Affiliations UCL
    Journal : Physics and Chemistry of Glasses
    Volume : 46
    Issue : 6
    Publisher : SOC GLASS TECHNOLOGY
    Pages : 547-552
    Url : http://discovery.ucl.ac.uk/184623/

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