the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Technical Note: How long can seawater oxygen samples be stored before titration?
M. Lankhorst
G. Chavez
S. H. Nam
U. Send
Abstract. The concentration of dissolved oxygen in seawater is routinely measured using a standardized titration method that involves analysis shortly after the water sample has been collected. However, none of the existing procedural documents are specific about how soon after collection the titration has to be done. Here, we report on a small number of samples where duplicates were collected and one batch was titrated within days after collection, while the other batch was stored for several weeks before titration. In addition, for a subset of the samples a third batch was taken that was stored like the others but with a particular chemical already added before storage. Comparison between the batches confirms that there is no significant difference between the ones that were stored and the ones that were analyzed sooner, indicating that a month-long storage period is acceptable. The implication of this is that such oxygen samples do not necessarily have to be analyzed while still on the ship; instead, it is possible to transport them ashore for analysis there.
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M. Lankhorst et al.


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SC C1114: 'Storage of oxygen samples is not a viable option for most research cruises', Melissa Miller, 01 Dec 2014
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AC C1193: 'Response to C1114', Matthias Lankhorst, 23 Dec 2014
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AC C1193: 'Response to C1114', Matthias Lankhorst, 23 Dec 2014
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RC C1116: 'The presented data does not support the claims of the authors.', Henry Bittig, 02 Dec 2014
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AC C1197: 'Response to C1116', Matthias Lankhorst, 23 Dec 2014
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AC C1197: 'Response to C1116', Matthias Lankhorst, 23 Dec 2014
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RC C1121: 'Interactive comments on “Technical Note: How long can seawater oxygen samples be stored before titration?” by M. Lankhorst et al.', Anonymous Referee #2, 02 Dec 2014
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AC C1203: 'Response to C1121', Matthias Lankhorst, 23 Dec 2014
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AC C1203: 'Response to C1121', Matthias Lankhorst, 23 Dec 2014
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SC C1192: 'Review of the Technical Note', George Anderson, 22 Dec 2014
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SC C1214: 'Zhang et al. (2002) report on long-term storage experiments of Winkler samples up to 7 months', Jan Kaiser, 23 Dec 2014
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AC C1258: 'Final response by authors', Matthias Lankhorst, 14 Jan 2015


-
SC C1114: 'Storage of oxygen samples is not a viable option for most research cruises', Melissa Miller, 01 Dec 2014
-
AC C1193: 'Response to C1114', Matthias Lankhorst, 23 Dec 2014
-
AC C1193: 'Response to C1114', Matthias Lankhorst, 23 Dec 2014
-
RC C1116: 'The presented data does not support the claims of the authors.', Henry Bittig, 02 Dec 2014
-
AC C1197: 'Response to C1116', Matthias Lankhorst, 23 Dec 2014
-
AC C1197: 'Response to C1116', Matthias Lankhorst, 23 Dec 2014
-
RC C1121: 'Interactive comments on “Technical Note: How long can seawater oxygen samples be stored before titration?” by M. Lankhorst et al.', Anonymous Referee #2, 02 Dec 2014
-
AC C1203: 'Response to C1121', Matthias Lankhorst, 23 Dec 2014
-
AC C1203: 'Response to C1121', Matthias Lankhorst, 23 Dec 2014
-
SC C1192: 'Review of the Technical Note', George Anderson, 22 Dec 2014
-
SC C1214: 'Zhang et al. (2002) report on long-term storage experiments of Winkler samples up to 7 months', Jan Kaiser, 23 Dec 2014
-
AC C1258: 'Final response by authors', Matthias Lankhorst, 14 Jan 2015
M. Lankhorst et al.
M. Lankhorst et al.
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