[john.shephard25]

Hi I bought from a friend Iron diluted in water since last year.Its been well kept in dark tank and in dark place.I was wondering: How long can diluted Iron be useful until it oxidate?

 

[Sharkfood]

Depends on the molecule. Chelated iron won't oxidize until it is seperated from the acid. If it's pure iron, I would imagine it will begin rusting immediately unless kept in an oxygen free environment. A low pH solution will last a longer time, whereas a more neutral or basic solution will break apart the molecule and cause free iron to drop out of the solution.

Also, DPTA is more stable than EDTA iron unless the pH of the solution is very low. In powder form, with near zero humidity, either will last a very, very long time. When mixed with most tap water, it will begin to degrade quickly. I would expect you could get weeks out of distilled water without a major breakdown. I haven't tested for this as I don't have the proper equipment. My iron test appears to register all iron in the solution or suspension, regardless of what other molecules it is affiliated with.

Hydroponic solutions are usually kept below pH 6.5 to help keep iron and manganese in the solution. Once the solution gets into the neutral range, iron precipitates out quickly.

 

[john.shephard25]

Yeap, its useless I knew it.Its very difficult for me to bay any kind of iron were I live and even if I could how 'm I suppose to use it. I usualy add CSM+B dry and I overdose once and a wile ...What about those branded liquid Iron fertilizers, are they good, what do you recommend?

 

[john.shephard25]

Well, I have diluted it in a destiled water and I keep it in a bottle that is firmly closed and in a dark so hopefully its working still.If I overdose Iron what can I expect?