Iron... - The Planted Tank Forum
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post #1 of 3 (permalink) Old 11-29-2006, 09:07 PM Thread Starter
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I have flourish liquid Iron form a few months ago before I switched to dry ferts.If I have red plants how much should i add in your HMOs? Also, could a hunk of rusting steal be added for Iron? haha.
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post #2 of 3 (permalink) Old 11-30-2006, 12:52 AM
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Rusting nails.....

- How big is your tank
- Heavy, moderated or low Plant mass
- Light and light period.

And Yep rusty nails (if not contaminated) will procured the ferric form of fe (Fe III). Less accessible for plant compared to the ferrous form(Fe II) but can be recombined with chelated agent like Humic acid, fulvic acid and tannic acid are examples on non-contaminant organic complexes. Phosphate also serves as a very effective complexing agent for iron, becoming available again to plant in a somewhat less soluble form than Fe II ferrous.

OXIDATION; (Ferrous) available to plant wen oxidize to become (Ferric)

This an idea for the time it take for Fe2 to oxidized:
At pH 7.0,
90% Fe2 oxidation requires 1 hour at 21 degrees C and
10 hours at 5 degrees C.

At pH 8.0, 90% Fe2 oxidation occurs in 30 seconds,

at pH 6.0 it requires 100 hours.

The critical dissolved oxygen concentration is 2 mg/L. Below that ferrous iron oxidation occurs slowly.
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post #3 of 3 (permalink) Old 11-30-2006, 02:18 AM Thread Starter
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whoa, I need to take the time to absorb that or find a way to dumb it down for me. So, if i add rusty nails in a ph of 6 it will take 4 days to oxidize. then it is FE III right? do plants prefer FE II or III? Will the rusty nails slowly release Iron and make it so i never really have to dose it? or do you need to separate the naisl form the main tank and make your own iron solution?

The tank is about 50% right now but as soon as the net orders get here it will be heavily planted.
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