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Potentiometric and spectrophotometric study of calcuim and alizarin red-S complexation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1992 (English)In: Acta Chemica Scandinavica, ISSN 0904-213X, E-ISSN 1902-3103, Vol. 46, no 5, p. 418-422Article in journal (Refereed) Published
Abstract [en]

Equilibria in the system H+, Ca2+ and Alizarin Red S have been studied by means of potentiometric (glass electrode) and spectrophotometric measurements in a 0.1 M NaCl medium at 25-degrees-C. Calcium complexation is characterized by the formation of ternary species according to the reaction: pH+ + qCa2+ + rHA2- half-arrow-right-over-half-arrow-left H(p)Ca(q)(HA)r(p+2q-2r) Equilibrium constants were evaluated within the range 3.3 less-than-or-equal-to -log[H] less-than-or-equal-to 10.3 and the wavelength interval 300 less-than-or-equal-to lambda less-than-or-equal-to 700 nm with the following results: log-beta(012) = 8.04 +/- 0.04 (pot.); log-beta(012) = 8.20 +/- 0.12 (spectr.); log-beta(-111) = -3.72 +/- 0.12 (pot.); log-beta(-111) -3.74 +/- 0.15 (spectr.); log-beta(-212) = 10.11 +/- 0.20 (pot.).All errors reported are 3-sigma (log-beta(pqr)). The protonation constants for Alizarin Red S were also determined. Data were analysed using the least-squares computer programs LETAGROPVRID (ETITR and SPEFO).

Place, publisher, year, edition, pages
1992. Vol. 46, no 5, p. 418-422
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-10855Local ID: 9bbb5190-1d1b-11dd-8384-000ea68e967bOAI: oai:DiVA.org:ltu-10855DiVA, id: diva2:983803
Note
Godkänd; 1992; 20080508 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Forsling, Willis

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