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

• Authors: Milan Meloun , Zuzana Ferenčíková , Lucie Netolická , Aleš Vrána
• Languages of publication: EN

Abstracts

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. [...]

Keywords

EN

Potentiometric titration; Dissociation constant; Naphazoline; ESAB; HYPERQUAD

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 1
• Pages: 66-74

Dates

published

1 - 2 - 2011

online

16 - 12 - 2010

Contributors

author

Milan Meloun

• Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic

author

Zuzana Ferenčíková

• Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic

author

Lucie Netolická

author

Aleš Vrána

• TEVA Pharmaceuticals, s.r.o., 747 70, Opava, Czech Republic

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Identifiers

DOI

10.2478/s11532-010-0117-9