Methods of Seawater Analysis recommend up to 12 h storage, but what if the highest precision is not required when working in tidal waters.
You should contact Chris Langdon at the University of Miami. On our cruise this summer I am sure we had some samples that sat around for a little more than 12 hours for open deep ocean water.
Good luck. J
Hello Victor,
Once fixed, the samples are chemically stable , so you can keep them for weeks before acid adition and titration.
The main threat is the possibility of air leak in to the bottles because of thermal contraction derived from temperature changes. To avoid this, what you have to do is keep the oxygen bottles tightly closed and covered by water, son no air can leak into them. With this precaution, we have stored and tranported oxygen samples over a month before titrating them.
I must say I owe knowing this usefull trick to my dear advisor, the now passed Professor Laurence D. Mee.
Saludos, Martin
Hoy he aprendido algo más con ustedes, gracias!! y Victor, gracias por preguntar...
I hadn't seen the answers to my question until now. Thanks a lot to all of you. I'm surprised (out of my ignorance on the chemistry of the solution that results from sample fixation) on how long samples can be stored based on Martin's answer. I'll appreciate the info on the bottles you mentioned Sinhue. Saludos to all.
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