Micro-Winkler titration method for dissolved oxygen concentration measurement

被引：52

作者：

Helm, Irja ^{[1
]}

Jalukse, Lauri ^{[1
]}

Vilbaste, Martin ^{[1
]}

Leito, Ivo ^{[1
]}

机构：

[1] Univ Tartu, Inst Chem, EE-51014 Tartu, Estonia

来源：

ANALYTICA CHIMICA ACTA | 2009年 / 648卷 / 02期

关键词：

Micro-Winkler titration; Gravimetric titration; Primary method; Dissolved oxygen; Measurement uncertainty; Uncertainty budget;

D O I：

10.1016/j.aca.2009.06.067

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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 all 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 (9-10g) 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). (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：167 / 173

页数：7

共 24 条

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