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Old 02/18/2020, 06:44 AM   #1
Scrubber_steve
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Stored NSW, parameter change over time.

Hello;

I use natural seawater to calibrate my test kits.
I would like to keep a few gallons stored for this purpose.

Which parameters would change over a period of a year or two?

I'm thinking alk, cal, mag & potassium would be stable?

Not sure about po4, no3 & pH ?

Cheers
Steve


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Old 02/18/2020, 10:17 AM   #2
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I would imaging you would have a TON of bacteria breakdown. IMO i would guess there would be a mini cycle in the storage contain you have and eventually have some deadstuff floating around. Cure what other experienced reefers have seen


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Old 02/18/2020, 04:31 PM   #3
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I would imaging you would have a TON of bacteria breakdown. IMO i would guess there would be a mini cycle in the storage contain you have and eventually have some deadstuff floating around. Cure what other experienced reefers have seen
Yes, how much this would affect pH, no3 & po4 I don't know,
but I'm more interested if that, or some other reaction may take place & change alk, cal, mag, pot readings?


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Old 02/18/2020, 05:28 PM   #4
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The calcium, alkalinity, and magnesium levels should be fine if the temperature remains in the safe zone. They would form a visible precipitate if there's a problem. Phosphate, nitrate, and pH could all shift. Bacteria would act on the dissolved nutrients, and carbon dioxide equilibration with the ambient air could change the pH.


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Old 02/18/2020, 05:39 PM   #5
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ok, thanks bertoni.

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carbon dioxide equilibration with the ambient air could change the pH.
If the container is sealed, & only outside fresh air enters the container when seawater is intermittently removed, do you think that the pH would shift at all?


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Old 02/18/2020, 06:01 PM   #6
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There still would be decay going on in the water that would change the pH. I wouldn't seal it, personally. That will cause some amount of anaerobic decay.


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Old 02/18/2020, 06:27 PM   #7
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There still would be decay going on in the water that would change the pH. I wouldn't seal it, personally. That will cause some amount of anaerobic decay.
Very interesting, thanks. A cloth cover would be better suited.


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