dc.contributor.author | Helm, Irja | |
dc.contributor.author | Jalukse, Lauri | |
dc.contributor.author | Leito, Ivo | |
dc.coverage.spatial | European | |
dc.date.accessioned | 2021-06-29T18:31:33Z | |
dc.date.available | 2021-06-29T18:31:33Z | |
dc.date.issued | 2013 | |
dc.identifier.citation | Helm, I., Jalukse, L. and Leito I. (2013) Report on method for improved, gravimetric Winkler titration. Tartu, Estonia University of Tartu, Institute of Chemistry, 38pp. DOI: http://dx.doi.org/10.25607/OBP-1231 | en_US |
dc.identifier.uri | https://repository.oceanbestpractices.org/handle/11329/1599 | |
dc.identifier.uri | http://dx.doi.org/10.25607/OBP-1231 | |
dc.description.abstract | This report presents a high-accuracy Winkler titration method that has been developed
for determination of dissolved oxygen concentration. Careful analysis of uncertainty
sources relevant to the Winkler method was carried out and the method was optimized
for minimizing all uncertainty sources as far as practical. The most important
improvements were: gravimetric measurement of all solutions, pre-titration to
minimize the effect of iodine volatilization, accurate amperometric end point detection
and careful accounting for dissolved oxygen in the reagents. As a result, the developed
method is possibly the most accurate method of determination of dissolved oxygen
available. Depending on measurement conditions and on the dissolved oxygen
concentration the combined standard uncertainties of the method are in the range of
0.012 – 0.018 mg dm-3 corresponding to the k = 2 expanded uncertainty in the range of
0.023 – 0.035 mg dm-3 (0.27 – 0.38%, relative). This development enables more
accurate calibration of electrochemical and optical dissolved oxygen sensors for
routine analysis than has been possible before. Most of this report is based on the
article I.Helm, L.Jalukse, I. Leito, Anal. Chim. Acta. 741 (2012) 21-31. | en_US |
dc.description.sponsorship | European Metrology Research Programme (EMRP) | en_US |
dc.language.iso | en | en_US |
dc.publisher | University of Tartu, Institute of Chemistry, | en_US |
dc.subject.other | Winkler method | en_US |
dc.subject.other | Dissolved oxygen | en_US |
dc.subject.other | Uncertainty quantification | en_US |
dc.subject.other | Primary method | en_US |
dc.title | Report on method for improved, gravimetric Winkler titration, | en_US |
dc.type | Report | en_US |
dc.description.status | Published | en_US |
dc.publisher.place | Tartu, Estonia | en_US |
dc.subject.parameterDiscipline | Dissolved gases | en_US |
dc.description.currentstatus | Current | en_US |
dc.description.sdg | 14.a | en_US |
dc.description.eov | Oxygen | en_US |
dc.description.adoption | Validated (tested by third parties) | en_US |
dc.description.methodologyType | Method | en_US |
dc.description.methodologyType | Description of a metrology standard | en_US |
obps.endorsementAuthorDeclared.recommendedPractice | European Metrology Research Programme (EMRP) | |
obps.contact.contactname | Ivo Leito | |
obps.contact.contactemail | ivo.leito@ut.ee | |
obps.resourceurl.publisher | https://sisu.ut.ee/sites/default/files/measurement/files/g_winkler_report_280613_0.pdf | |