Preprints
https://doi.org/10.5194/osd-11-2447-2014
https://doi.org/10.5194/osd-11-2447-2014
29 Oct 2014
 | 29 Oct 2014
Status: this preprint was under review for the journal OS. A revision for further review has not been submitted.

Technical Note: How long can seawater oxygen samples be stored before titration?

M. Lankhorst, G. Chavez, S. H. Nam, and 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, G. Chavez, S. H. Nam, and U. Send
 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
M. Lankhorst, G. Chavez, S. H. Nam, and U. Send
M. Lankhorst, G. Chavez, S. H. Nam, and U. Send

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