View source for Winkler light-dark dissolved O2 bottle

* [[Page authors|Page authors]]: [[User:Anabelvonjackowski|Anabel von Jackowski]]
* [[Responsible curator|Responsible curator]]:  [[User:Anabelvonjackowski|Anabel von Jackowski]]


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! Oxygen Concentration
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| '''Approach:''' Winkler titration (iodometric)
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| '''Context:''' discrete measurement
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| '''Spatial scale:''' mL
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| '''Temporal scale:''' ''in situ''
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| '''Units:''' mmol O<sub>2</sub> L<sup>-1</sup>
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| '''Community captured:''' all
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| '''Co-measurements:''' temperature, salinity, depth
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== Method Overview ==

Dissolved O₂ measures the gas concentrations of oxygen from the depths of interest. This measurement can be measured using the Winkler method via iodometric titration because dissolved oxygen does not directly oxidize iodide to iodine and a multi-step reaction in which manganese acts as an intermediate “transfer” agent. <ref name = "Winkler1888">Winkler, L. W. (1888). *Die Bestimmung des im Wasser gelösten Sauerstoffes*. Berichte der Deutschen Chemischen Gesellschaft, 21(2), 2843–2854. https://doi.org/10.1002/cber.188802102122</ref>.