Micro-Winkler titration method for dissolved oxygen concentration measurement

In this report a gravimetric micro-Winkler titration method for determination of dissolved oxygen concentration in water is presented. Mathematical model of the method taking into account all influence factors is derived and an uncertainty analysis is carried out to determine the uncertainty contrib...

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Bibliographic Details
Published in:Analytica chimica acta 2009-08, Vol.648 (2), p.167-173
Main Authors: Helm, Irja, Jalukse, Lauri, Vilbaste, Martin, Leito, Ivo
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical and thermal methods
Chemistry
Dissolution
Dissolved oxygen
Estimates
Exact sciences and technology
Gravimeters
Gravimetric titration
Mathematical analysis
Mathematical models
Measurement uncertainty
Micro-Winkler titration
Primary method
Titration
Uncertainty
Uncertainty budget
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Summary:In this report a gravimetric micro-Winkler titration method for determination of dissolved oxygen concentration in water is presented. Mathematical model of the method taking into account all influence factors is derived and an uncertainty analysis is carried out to determine the uncertainty contributions of all influence factors. The method is highly accurate: the relative expanded uncertainties ( k = 2) are around 1% in the case of small (9–10 g) water samples. The uncertainty analysis carried out in characterizing the uncertainty of the method is the most comprehensive published for a micro-Winkler method, resulting in experimentally obtained estimates for all uncertainty sources of practical significance (around 20 uncertainty sources altogether).
ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2009.06.067