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Estimation of composition, coordination model, and stability constant of some metal/phosphate complexes using spectral and potentiometric measurements
Abu-Shandi, Khalid and Al-Wedian, Fadel Estimation of composition, coordination model, and stability constant of some metal/phosphate complexes using spectral and potentiometric measurements Chemical Papers, Vol.63, No. 4, 2009, 420-425
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Author(s) |
Abu-Shandi, Khalid
Al-Wedian, Fadel
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| Title |
Estimation of composition, coordination model, and stability constant of some metal/phosphate complexes using spectral and potentiometric measurements
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| Journal name |
Chemical Papers
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| Publication date |
2009
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| Year available |
2009
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| Volume number |
63
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| Issue number |
4
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| ISSN |
0366-6352
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| Start page |
420
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| End page |
425
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2009
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| Language |
english
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| Subject |
250000 Chemical Sciences
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| Abstract/Summary |
Complexation reactions in a binary metal/phosphate system were studied. Protolytic equilibria of phosphate in the presence of cobalt, nickel, iron, copper, chromium and silver metal ions were investigated by potentiometric titrations in the pH range of 2–11. Stability constants of the metal/phosphate complexes were determined by computer analysis of the potentiometric titration. Potentiometric titrations suggest that the presence of metal phosphate and metal hydrogen phosphate provides the solutions with stability constants logK c 2.21, 2.11, 2.23, 2.34, 1.96, and 2.14 of Co, Ni, Fe, Ag, Cr, and Cu/phosphate, respectively. The results of infrared spectroscopy, X-ray powder diffraction and equilibrium studies were used to reveal the mode of interaction between the metal ions and phosphate. Metal phosphates with a hydrogen phosphate anion and fully nonprotonated phosphate could be isolated under the reaction conditions.
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