Dosing weekly = iron deficiency? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-13-2014, 03:12 PM Thread Starter
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Dosing weekly = iron deficiency?

If iron binds to phosphate, doesn't that mean that if you add phosphate the day after dosing iron, the iron will be pulled out of the water column for the rest of the week?

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post #2 of 6 (permalink) Old 11-13-2014, 04:11 PM
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Hi,


No.

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post #3 of 6 (permalink) Old 11-13-2014, 06:12 PM Thread Starter
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Hi,

Why not?

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post #4 of 6 (permalink) Old 11-13-2014, 06:18 PM
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It's a matter of probability where a molecule interact with another molecule. Probability is high in a 500ml bottle but not so much in a 29G tank for instance. It probably does.
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post #5 of 6 (permalink) Old 11-13-2014, 06:22 PM
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Fe would bind to PO4- but only if the Fe is unbound. If it's bound to a chelator, the chelator would prevent it from binding to PO4-.
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post #6 of 6 (permalink) Old 11-13-2014, 06:34 PM
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Hi,

Mr. Greens answer is good enough as a way of looking at or thinking about it.

The actual answer has to do with ionic strength, in this case until a certain concentration is reached, 0.1M; in this case, water is strong enough to keep the ions apart (without getting too technical we are talking same range of ionic strength). Probabilities as a practical matter play no role (no smart alecks need apply, talking practical application in our aquariums).

This is why we can use “insoluble” substances (CaSO4 for instance) in our aquariums.

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Originally Posted by Solcielo lawrencia View Post
Fe would bind to PO4- but only if the Fe is unbound. If it's bound to a chelator, the chelator would prevent it from binding to PO4-.
Hi Solcielo lawrencia, All,

Obviously, the strength of the ligands play a part, but PO4- is really likable. You can try this by making a solution of whichever iron chelates you wish and you choice of phosphates.

In fact varying concentrations, temperatures and pH it is quite easy to see the varying effects.

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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.

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