DIY trace solutions - How dilute is too dilute? When should I remake the solutions?

StubbyAcro

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Hello @Randy Holmes-Farley. You mentioned in a few threads that the less concentrated a solution is, the less stable it is due to air oxidation. I understand that the rate of air oxidation is different for different elements but I don't know how long will my DIY trace solutions last in semi-airtight dosing containers.

Can you give me a recommendation of when I should remake my DIY trace solutions?

Right now, I'm dosing:

- Iron: Mixed at 2000mg/L of iron
- Potassium Iodide: Mixed at 764mg/L of iodine
- Manganese sulphate: Mixed at 320mg/L of manganese
 

DanyL

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I don't make my own traces, but I am diluting those I buy for better accuracy and safety when dosing.

Maybe instead of being concerned about it you can make highly concentrated solutions, and once every 1 to 3 weeks make diluted solutions from it to fill the containers.
 

Randy Holmes-Farley

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What iron ingredient did you use to make that solution?

If it is not a chelated iron, then precipitation of iron oxide is an indication of an issue.
 
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