期刊
MEASUREMENT
卷 106, 期 -, 页码 190-195出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2017.05.004
关键词
Winlder's method; Dissolved oxygen; Functional relationship estimation by maximum likelihood; Statistical analysis
资金
- Indian Institute of Technology Kanpur
A modification to the standard Winkler's method (WM) for measurement of dissolved oxygen (DO) concentration in aqueous samples enabled DO measurements in 1 mL sample volume. However, advanced statistical analysis indicated that the proposed method (PM) showed a small positive bias, giving results that were on average about 6% higher than corresponding values measured using the WM. In this study, DO measurements were carried out in sample volumes ranging from 2 mL to 10 mL using the PM. Statistical analysis of these results indicate that the bias reported in the PM could be eliminated (i.e., limited to a +/- 2% range) using sample volumes of 7 mL or higher. Use of a larger sample volume also enables lowering the least count of the PM to 0.1 mg/L O-2 as compared to 0.25 mg/L O-2 reported previously. (C) 2017 Elsevier Ltd. All rights reserved.
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