Publication: A reverse-flow injection analysis method for the determination of dissolved oxygen in fresh and marine waters
Issued Date
2002-12-06
Resource Type
ISSN
00399140
Other identifier(s)
2-s2.0-0038375037
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Mahidol University
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SCOPUS
Bibliographic Citation
Talanta. Vol.58, No.6 (2002), 1285-1291
Suggested Citation
Saowapha Muangkaew, Ian D. McKelvie, Michael R. Grace, Mongkon Rayanakorn, Kate Grudpan, Jaroon Jakmunee, Duangjai Nacapricha A reverse-flow injection analysis method for the determination of dissolved oxygen in fresh and marine waters. Talanta. Vol.58, No.6 (2002), 1285-1291. doi:10.1016/S0039-9140(02)00414-9 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/20117
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Title
A reverse-flow injection analysis method for the determination of dissolved oxygen in fresh and marine waters
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Abstract
A reverse flow injection method (rFIA) based on the Winkler titration chemistry, is reported for the determination of dissolved oxygen (DO) in natural waters. Manganese(II) sulfate is injected into a continuously flowing stream of sample and subsequently merges with a reagent stream of sodium hydroxide and sodium iodide. Manganese(II) hydroxide that is formed reacts with DO in the sample to form an oxidized manganese hydroxyoxide floc, Addition of 10% sulfuric acid dissolves this floc, and under acidic conditions, the triiodide ion formed is detected by photometry in a flow through cell at a wavelength of 440 nm. The method is rapid (48 measurements per h), repeatable (R.S.D. ca. 3%, n = 3), and has a calculated detection limit of 0.25 mg l-1(P = 0.001). No interference from nitrite or ferrous ions was observed at concentrations typically found in natural waters. The method has been successfully applied to on-line measurement of DO in sediment respiration reactors. © 2002 Elsevier Science B.V. All rights reserved.