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2011 | 9 | 1 | 66-74
Tytuł artykułu

The thermodynamic dissociation constant of naphazoline by the regression analysis of potentiometric data

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The mixed dissociation constant of naphazoline is determined at various ionic strengths I [mol dm−3] in the range of 0.01 to 0.26 and at temperatures of 25°C and 37°C using ESAB and HYPERQUAD regression analysis of the potentiometric titration data. A strategy of efficient experimentation is proposed in a protonation constant determination, followed by a computational strategy for the chemical model with a protonation constant determination. Two group parameters, L 0 and H T were ill-conditioned in the model and their determination is therefore uncertain. These group parameters, L 0 and H T, can significantly influence a systematic error in the estimated common parameter pKa and they always should be refined together with pK a. The thermodynamic dissociation constant pK aT was estimated by nonlinear regression of {pK a, I} data at 25°C and 37°C: for naphazoline pK alT = 10.41(1) and 10.13(2). Goodness-of-fit tests for various regression diagnostics enabled the reliability of the parameter estimates to be found. [...]
Wydawca

Czasopismo
Rocznik
Tom
9
Numer
1
Strony
66-74
Opis fizyczny
Daty
wydano
2011-02-01
online
2010-12-16
Twórcy
autor
  • Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic, milan.meloun@upce.cz
  • Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic
autor
  • TEVA Pharmaceuticals, s.r.o., 747 70, Opava, Czech Republic
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-010-0117-9
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