How to calculate NH3 in your pond

Discussion in 'Water Chemistry' started by MitchM, Dec 23, 2016.

  1. MitchM

    MitchM

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    I came across a table and a calculator that a person can use in order to calculate the free ammonia (NH3) level in their pond (or aquarium) when they get a positive reading on their ammonia test kit.
    The maximum recommended NH3 level for koi is .02 milligrams/liter, long term.

    You need 3 values to determine if your fish are at risk - Temperature (celsius), PH, and the ammonia reading from your test method.

    Here is a calculator where you plug in your numbers to determine the actual NH3 level:
    http://home.eng.iastate.edu/~jea/w3-research/free-ammonia/nh3.html

    Here is a chart that displays the maximum allowable TAN (Total Ammonia Nitrogen) reading, in parts per million (ppm) from your test method.
    The chart below came from this website: http://mankysanke.co.uk/html/ammonia.html

    Parts per million (ppm) = milligrams per liter (mg/L)

    Maximum allowable TAN .jpg
     
    Last edited: Dec 23, 2016
    MitchM, Dec 23, 2016
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    Meyer Jordan and morewater like this.
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  2. MitchM

    Meyer Jordan Tadpole

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    Did a quick comparison of the Iowa State calculator linked above to the calculator that has been used for many years that was originally from a New York Koi club.
    http://www.koiphen.com/forums/koicalcs.php?do=calcnh3c

    The results are quite different. So which one is right?
     
    Meyer Jordan, Dec 23, 2016
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  3. MitchM

    MitchM

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    I just plugged .25 tan, 10c and 8.2 PH. I got the same results in both - 0.007 nh3
    Which values did you use?
     
    MitchM, Dec 23, 2016
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  4. MitchM

    Meyer Jordan Tadpole

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    OK. The Koiphen calculator is rounding-ff to the higher 3 decimal value. Maybe not so different after all.
     
    Meyer Jordan, Dec 23, 2016
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  5. MitchM

    MitchM

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    I tried to find the algorithm from the Iowa State calculator so I could double check, but the webpage for the formula is no longer available.
     
    MitchM, Dec 23, 2016
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  6. MitchM

    Meyer Jordan Tadpole

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    Is this what you are looking for-

    EQUATION 1.
    pKa = 0.0901821 + 2729.92 / T
    Where,
    T = Temperature in K; Absolute zero = - 273.15 oC
    T (in K) = T (in oC) + 273.15
    EQUATION 2.
    f = 1 / [10 (pKa - pH) + 1]
    Where,
    f = fraction of total ammonia that is un-ionized
    pKa = dissociation constant from equation 1
     
    Meyer Jordan, Dec 23, 2016
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  7. MitchM

    MitchM

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    Ha, maybe.:)

    I'm still kicking myself for not saving a hard copy of the original pond heat loss calculator I had.
    I would like to make up an Excel worksheet so I don't lose some of these calculators.
    The Iowa calculator is from 1998 and the Koiphen original source (New York Koi Club) for their ammonia calculator is no longer around.
    Thanks.
     
    MitchM, Dec 23, 2016
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  8. MitchM

    Mmathis TurtleMommy

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    @addy1 Maybe [once they decide which one is the most correct] this can be added as a "sticky" under this topic....?
     
    Mmathis, Dec 26, 2016
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