Spectrophotometric study of competitive complexation equilibria involving overlapped spectral responding species: Determination of the stability constant of bismuth-pyrophosphate complex

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creativework.keywordsBi-PAR, Bi-pyrophosphate, Competitive spectrophotometry, Overlapping spectra, Stability constant determination
dc.contributor.authorNedeltcheva T.
dc.contributor.authorSurleva A.
dc.contributor.authorNikolova L.
dc.contributor.authorBorissova R.
dc.contributor.authorGeorgieva S.
dc.date.accessioned2024-07-10T14:27:03Z
dc.date.accessioned2024-07-10T14:47:58Z
dc.date.available2024-07-10T14:27:03Z
dc.date.available2024-07-10T14:47:58Z
dc.date.issued2012-12-01
dc.description.abstractSpectrophotometric study of competitive complex formation equilibria involving overlapped spectral responding species applying a simple and versatile algorithm was carried out. The algorithm involves multivariable regression for calculation of equilibrium concentrations from multiwavelength data and mass action law for the stability constant calculation. The used regression functions are part of common statistical software. Stability constants and complex stoichiometry of competing equilibria were simultaneously determined. The species concentration profiles at several spectral overlapping and α-coefficient of competing reaction were obtained. Non-absorbing bismuth - pyrophosphate (PPh) system was studied as a competitive reaction of bismuth - 4-(2-Pyridylazo) resorcinol (PAR) complex. The formation of Bi-PPh complex with 1:1 stoichiometry was proved in the studied concentration region (C Bi = 1×10 -5 mol L -1; C PPh = 5×10 -6 - 1×10 -4 mol L -1). The stability constant of the complex at pH 1 and μ= 1.0 have been determined: logβ = 4.2±0.2. © Versita Sp. z o.o.
dc.identifier.doi10.2478/s11532-012-0117-z
dc.identifier.issn1895-1066
dc.identifier.issn1644-3624
dc.identifier.scopusSCOPUS_ID:84867046713en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/255
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84867046713&origin=inward
dc.titleSpectrophotometric study of competitive complexation equilibria involving overlapped spectral responding species: Determination of the stability constant of bismuth-pyrophosphate complex
dc.typeArticle
oaire.citation.issue6
oaire.citation.volume10
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