DIY chelated Fe? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 08-27-2019, 07:22 PM Thread Starter
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Smile DIY chelated Fe?

Hi All,

Sorry to spam . Don't think a thread on DIY fe exists.

Can some suggest how to make a DIY Fe chelated for planted aquarium preferably with DTPA with Ferrous or ferric sulphate.

I have a Ferric Sulphate(Fe2(So4)3) 500g bottle lying in my shelf and i feel it is of no use so far which i brought some how some time back. Can this be chelated with DTPA?

I general if some can say how much amount of Fe(Ferrous or ferric sulphate or any other Fe compound)
and how much amount of DTPA to mix? To achieve a 0.1PPM of Fe for 500ml container per a 5ml dose.

Would of great help.

My Fe2(So4)3 bottle.

Thanks,
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post #2 of 7 (permalink) Old 08-28-2019, 12:10 AM
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I have not tried myself, but Sigma (owned by Merck) does apparently have a protocol for this:

https://www.sigmaaldrich.com/technic...-solution.html

Edit: My apologies, the protocol is for ferrous sulfate, and not the ferric version you have. I'll leave it up for those that are interested, however.

It might be more trouble than it's worth, but you can consider trying to reduce the ferric to ferrous sulfate before proceeding

Anthony


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post #3 of 7 (permalink) Old 08-28-2019, 05:35 AM Thread Starter
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Thanks.

Ive seen this but it is EDTA.Looking for a DTPA.

Quote:
Originally Posted by Darkblade48 View Post
I have not tried myself, but Sigma (owned by Merck) does apparently have a protocol for this:

https://www.sigmaaldrich.com/technic...-solution.html

Edit: My apologies, the protocol is for ferrous sulfate, and not the ferric version you have. I'll leave it up for those that are interested, however.

It might be more trouble than it's worth, but you can consider trying to reduce the ferric to ferrous sulfate before proceeding

How to reduce ferric to ferrous sulfate ? is there a way?

Last edited by Darkblade48; 08-29-2019 at 12:06 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #4 of 7 (permalink) Old 08-29-2019, 12:15 AM
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DTPA should be similar to EDTA chelation; the only difference should be pH stability.

For reduction of ferric to ferrous cations, you can do it chemically, but that would introduce unwanted species into your solution. You can also do it electrochemically, but it would take more time/energy/effort than just buying the proper stuff from the get go, to be honest.
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post #5 of 7 (permalink) Old 08-29-2019, 12:39 AM
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Hwy @n70me good to see you over here.

I didn't think it was going to be easy.

Like mentioned above, seems a lot easier to just get some DTPA.


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post #6 of 7 (permalink) Old 08-29-2019, 02:37 PM Thread Starter
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Quote:
Originally Posted by Darkblade48 View Post
I have not tried myself, but Sigma (owned by Merck) does apparently have a protocol for this:

https://www.sigmaaldrich.com/technic...-solution.html

Edit: My apologies, the protocol is for ferrous sulfate, and not the ferric version you have. I'll leave it up for those that are interested, however.

It might be more trouble than it's worth, but you can consider trying to reduce the ferric to ferrous sulfate before proceeding
what does 10X and 200X mentioned in the above link mean. i.e 10% i.e 10PPM ,200% 200PPM of Fe?

Bump:
Quote:
Originally Posted by Darkblade48 View Post
DTPA should be similar to EDTA chelation; the only difference should be pH stability.



For reduction of ferric to ferrous cations, you can do it chemically, but that would introduce unwanted species into your solution. You can also do it electrochemically, but it would take more time/energy/effort than just buying the proper stuff from the get go, to be honest.
DTPA and EDTA both differ in chemical formula hence both would differ in the quantity required to chelate.

Quote:
Originally Posted by Greggz View Post
Hwy @n70me good to see you over here.

I didn't think it was going to be easy.

Like mentioned above, seems a lot easier to just get some DTPA.
Hi Gregg,

May be i will try to get ferrous sulphate and do this instead of ferric sulphate.
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Last edited by n70me; 08-29-2019 at 02:48 PM. Reason: .
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post #7 of 7 (permalink) Old 08-30-2019, 12:03 AM
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Quote:
Originally Posted by n70me View Post
what does 10X and 200X mentioned in the above link mean. i.e 10% i.e 10PPM ,200% 200PPM of Fe?
The site makes mention of this: Concentrations of components are based upon those present in MS basal salt formulations and utilized in McCown's Woody Plant Medium.


So a 10x would be 10 times stronger than the reference, and a 200x would be 200 times stronger.


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DTPA and EDTA both differ in chemical formula hence both would differ in the quantity required to chelate.
You can figure out how much more is needed using the molar masses of DTPA.
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