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Fe DTPA solution: adding HCL 10%

Discussion in 'Aquatic Plant Fertilization' started by jonny_ftm, Mar 6, 2010.

  1. jonny_ftm

    jonny_ftm Guru Class Expert

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    Hi,

    Finally, I got my hands on some DTPA Fe 10%, thanks to Rex Grigg.

    I'd like a solution with 15g in 500ml of distilled. How much HCl 10% should I add to avoid Fe precipitation/oxidation?
     
  2. Philosophos

    Philosophos Lifetime Charter Member
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    My stock solutions have been happy at 5-6ml/L of HCl. At 10% that would be 50-60ml.
     
  3. barbarossa4122

    barbarossa4122 Guru Class Expert

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  4. jonny_ftm

    jonny_ftm Guru Class Expert

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    50-60ml HCl 10%?

    Isn't that much?
     
  5. Tom Barr

    Tom Barr Founder
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    5-10mls ought to do.
    Add this First, then add chelated DTPA after(say 5 minutes or so).

    Regards,
    Tom Barr
     
  6. jonny_ftm

    jonny_ftm Guru Class Expert

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    Many thanks Tom,

    Was fearing to add 50ml HCl in my plastic container...

    So 10ml in 500ml stock solution or in 1L you mean?
     
  7. Philosophos

    Philosophos Lifetime Charter Member
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    I use 50-60ml all the time without trouble. It raises Cl- by maybe 2-3ppm in a week. I use this much because bad handling practices happen, and I mix my batches for others who may not have much of a grasp of planted tanks or that contamination is a problem.

    Tom, I think the 5 minute wait is what I was missing. I was having some very fun issues with chelates when HCl was added first.
     
  8. Left C

    Left C Lifetime Members
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    Hi jonny_ftm

    The Fe DTPA that you got from Rex; is this it? Chelated Iron 10% ½ lb $9.25: http://www.bestaquariumregulator.com/ferts.html

    The reason that I ask, I thought that he was selling a different chelated iron.

    Thanks,
    Left C
     
  9. jonny_ftm

    jonny_ftm Guru Class Expert

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    Yes, it is that iron. He told me first it was EDTA. Then, he contacted his reseller that informed him it is DTPA now. I ordered it once he confirmed it is DTPA. But nothing shown on bags, sadely

    By the way, anyone knows a way I can differentiate between EDTA and DTPA to be sure of what I have?
     
  10. Left C

    Left C Lifetime Members
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    Thank you for the information.
     
  11. jonny_ftm

    jonny_ftm Guru Class Expert

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    np

    But any help on how to distinguish between EDTA and DTPA?
     
  12. Philosophos

    Philosophos Lifetime Charter Member
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    EDTA is browin-ish. It'll be the same shade of brown as the darker flecks in CSM+B. DTPA is a nice yellow.

    In a stock solution at high concentration, the EDTA seems to stay brown, the DTPA turns a rusty red color.
     
  13. jonny_ftm

    jonny_ftm Guru Class Expert

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    You mean really yellow or a yellow brown? Would you post a photo of some DTPA powder please? The Fe I received from Rex looks more like CSM in tint, I'm getting a bit worried here.
     
  14. Philosophos

    Philosophos Lifetime Charter Member
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    Here's a couple pictures from a Chinese supplier:

    [​IMG]

    EDTA:
    [​IMG]

    They've got both under some bright light; mine tends to look a hair darker for both. Still, it gives you a pretty accurate idea.
     
    #14 Philosophos, Apr 6, 2010
    Last edited by a moderator: Apr 6, 2010
  15. barbarossa4122

    barbarossa4122 Guru Class Expert

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    Mine looks like the bottom pic.
     
  16. jonny_ftm

    jonny_ftm Guru Class Expert

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    Yeah, mine too, hard to say, I'm becoming doubtful, but no way to verify at 100%
     
  17. barbarossa4122

    barbarossa4122 Guru Class Expert

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    Well, if GLA sold it to me as 10% DTPA , I just have to trust them, I guess.
     
  18. jonny_ftm

    jonny_ftm Guru Class Expert

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    Same for me with Rex, I fully trust him, but he has to rely on his supplier
    Looking on the net I saw other photos of DTPA with even a more brownish aspect, adding to the confusion.
     
  19. barbarossa4122

    barbarossa4122 Guru Class Expert

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    To tell you the truth, I never thought about this until you ask for DPTA pics.:)
     
  20. Left C

    Left C Lifetime Members
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