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Journal

2011 | 9 | 1 | 66-74

Article title

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

Content

Title variants

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. [...]

Publisher

Journal

Year

Volume

9

Issue

1

Pages

66-74

Physical description

Dates

published
1 - 2 - 2011
online
16 - 12 - 2010

Contributors

author
  • Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic
  • Department of Analytical Chemistry, University of Pardubice, 532 10, Pardubice, Czech Republic
author
  • TEVA Pharmaceuticals, s.r.o., 747 70, Opava, Czech Republic

References

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11532-010-0117-9
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