Seawater Elements effecting dissolved oxygen

[BrandonS]

More of a general seawater question than reef tank related. Are there any elements or minerals in seawater that could effect dissolved oxygen? I know temp is usually the biggest contributor to dissolved gasses in water.

More asking as a potential answer to super saturation.

 

[Randy Holmes-Farley Verified Community Expert]

Salinity in general impacts oxygen solubility, but there is no individual ion that has a disproportionally large part of that effect. Ions tightly bind many water molecules around them, leaving fewer to interact with dissolving oxygen.

 

[Dan_P]

More of a general seawater question than reef tank related. Are there any elements or minerals in seawater that could effect dissolved oxygen? I know temp is usually the biggest contributor to dissolved gasses in water.

More asking as a potential answer to super saturation.

Interesting question? Were you thinking of any particular elements, e.g., iron, that stimulated the question?

 

[BrandonS]

Not specifically. Phosphates would be one I would be curios about. We run into a situation where we get small periods of hyper saturation. They do not necessarily follow the other indicators you would expect for hyper saturation. Just curious if anyone has any ideas.

 

[BrandonS]

Salinity in general impacts oxygen solubility, but there is no individual ion that has a disproportionally large part of that effect. Ions tightly bind many water molecules around them, leaving fewer to interact with dissolving oxygen.

Thank you,

must be some other environmental factor.

 

[Dan_P]

Not specifically. Phosphates would be one I would be curios about. We run into a situation where we get small periods of hyper saturation. They do not necessarily follow the other indicators you would expect for hyper saturation. Just curious if anyone has any ideas.

I take it that you are measuring oxygen in an aquarium and periodically seeing O2 levels that exceed expected oxygen levels for a given combination of temperature and barometric pressure, yes?

 

[BrandonS]

yes as well as total dissolved gas.

 

[BrandonS]

could iodine have an impact if it was super concentrated?

 

[Dan_P]

yes as well as total dissolved gas.

This sounds like more than a casual interest about water quality. Is this part of a research project?

 

[Dan_P]

could iodine have an impact if it was super concentrated?

Have you ruled out photosynthesis as the reason for the observed supersaturation of oxygen?

 

[sixty_reefer]

More of a general seawater question than reef tank related. Are there any elements or minerals in seawater that could effect dissolved oxygen? I know temp is usually the biggest contributor to dissolved gasses in water.

More asking as a potential answer to super saturation.

i think Kalkwasser as it reacts directly with the co2 in the water column.

 

[BrandonS]

Have you ruled out photosynthesis as the reason for the observed supersaturation of oxygen?

The supersaturation occurs several times during a day and even happens at night, but is inconsistent and seems to have calm times that are not annual or consistent. It is a possibility that photo synthesis is contributing . I need to try to isolate a few things to know for sure. It is not part of a research project. Something observed on a system and contemplating a reason to why. Was brainstorming and figured reef2reef has a lot of people on it smarter than I and was curious if anyone had any ideas.

Thank you for the input guys!

 

[Randy Holmes-Farley Verified Community Expert]

could iodine have an impact if it was super concentrated?

No.

 

[Randy Holmes-Farley Verified Community Expert]

i think Kalkwasser as it reacts directly with the co2 in the water column.

would not impact oxygen.

 

[taricha]

The supersaturation occurs several times during a day and even happens at night, but is inconsistent and seems to have calm times that are not annual or consistent. It is a possibility that photo synthesis is contributing

only other thing I can think of that hasn't been mentioned already is reactive oxygen species like h2o2 and ozone could break down and contribute o2. A sneakier way something similar could happen is that a UV sterilizer could possibly generate short-lived reactive oxygen species. No idea if this could happen fast enough to create measurable supersaturation of O2.
If you trust the calibration on the meter, then photosynthesis is the overwhelmingly likely answer until you eliminate it as a possibility.