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The Custom Micro Mix Thread

Discussion in 'Aquatic Plant Fertilization' started by Greggz, Dec 16, 2017.

  1. Tom Barr

    Tom Barr Founder
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    They list interferences(special scenarios) with the method in the Standard methods protocol.
    If you use a triazine color reagent, then 10% EDTA can impact the results.
    High pH etc. But they generally use a reducing agent as part of the protocol.
    They want all the Fe converted to the free Fe2+ form. Most every method does this, but the reducing agents can vary.

    Since you suggest that your revised method is true/better/superior/more true, why not do this for all test regarding Fe? Should that not be listed in the protocols for the methods?
    Why is that not suggested?


    Is a standard reference solution of FE being made also? I see a lot of test and talk, but little on the methods.
    No mention of a standard reference being used in testing.

    If someone brings it up after the question is posed.......it does not instill much confidence.
    Still, as long as it is done.......and included, that does not matter.

    Make a standard solution of the Fe. Then you can compare your method with that of the sample and change from the method/s.
    Many hobbyists noted that the Fe test kits changed color and became more intense over long time frames. But it goes back to the method.
    None of them made a standard reference solution to compare that I recall. Getting them to use a standard reference for NO3 and PO4 test was bad enough.

    This way you get around the method time issue and make sure your method is correct(and you can set a new time reaction to correlate with your own data).
    Say your data suggest a rx time of 4.25 hours to match your known reference sample using X method.

    Note, you can add tank water to make known references and use distilled/RO water etc(say for each type of chelator of interest).
    I would do both.
    You may also freeze tank water samples and then measure all at once later on. Better than testing several times a week etc.
     
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  2. acinonyx

    acinonyx Member

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    I know how to design my chemistry experiments, thanks though! :)
     
  3. SingAlongWithTsing

    SingAlongWithTsing Junior Poster

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    just to clarify, daily dosing at 100%? not half doses every other day right?
     
  4. burr740

    burr740 ~~ Lover of Micros ~~
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    Right, full dose every day.
     
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  5. Phishless

    Phishless Lifetime Member
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    Well I have compared many different posted dosing schedules from here and TPT.
    Added to it all the micro mixes possible based on EI Fe content to it.
    Also added suggested dosing from various bottled products to view how minimal they are.
    Have not yet included my present dosing as it has been altered.
    Not sure what to mix up @ this point regarding ratios etc...
    Need to sit on this a bit longer and revisit spreadsheet this eve.

    I've been dosing my normal mix @ reduced amounts, but daily.
    No cloudy water as before. Wanting to make it cloudy one more time for some explanation though.
     
  6. fablau

    fablau rotalabutterfly.com
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    Hey Joe, could you please confirm what you wrote about Ni is a typo: it should be .05 ppb not .5 ppb. Right?
     
  7. fablau

    fablau rotalabutterfly.com
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    Also: I know you calculate ppms for your 75gl tank as for 60gl. Is that still true? I think folks should know about that. Thanks Joe!
     
  8. burr740

    burr740 ~~ Lover of Micros ~~
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    .5 ppb

    From what I can gather it has a very low potential for toxicity, far lower than Cu for example.
     
  9. fablau

    fablau rotalabutterfly.com
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    Oh, ok, I misunderstood some statement before then. Thanks for confirming ;)
     
  10. fablau

    fablau rotalabutterfly.com
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    @burr740 maybe you missed it, but I’d like to know if your current dosing’s ppms are applied to a reduced tank-volume. For example, dosing for a 75gl tank are actually calculated for a 60gl, etc... just to clarify for everyone. Thanks
     
  11. burr740

    burr740 ~~ Lover of Micros ~~
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    My tanks are 50 gal, 75 gal and 120 gal.

    Dosed at 40 gal, 60 gal and 100 gal
     
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  12. fablau

    fablau rotalabutterfly.com
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    Thank you Joe!
     
  13. zervan

    zervan Junior Poster

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    Many people are checking their water tests on reference solutions, me too. I've checked my JBL Fe test on Fe-EDDHMA which I was using for years - and it was measuring fine. It was long time ago, so I made it again now...

    I've prepared two 1 liter solutions of 0.7 mg/l Fe - EDDHMA (pink color even in this small volume) and DTPA (no color visible) in RO water. Then I was measuring Fe concentration using JBL test (https://www.jbl.de/en/products/detail/2442/jbl-iron-test-fe), expiration 2/2018. This test has reaction time of 5 minutes, according to the manual. But for all the years I use to leave it on sunshine or on the aquarium cover under strong light until the next day.

    Here are the results:
    • Fe-EDDHMA:
      • after 5 minutes 0.4 mg/l;
      • after 2 hours 0.6 mg/l;
      • next day 0.6 mg/l.
    • Fe-DTPA:
      • after 5 minutes almost nothing (less than 0.05 mg/l);
      • after 1 hour 0.6 mg/l;
      • after 4 hours something between 0.6 and 0.8 mg/l.
    So it seems that more time is needed to break chelates - but we can measure them. I don't have any other chelates. It would be fine to check also Fe-EDTA.
     
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