This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Unfortunately for Photobucket users, things have changed in a big way as of June 26th they are rolling out a $399 per year subscription fee for those who want to hotlink images from Photobucket’s servers to display elsewhere.
    This does not mean it only affects this site, It now means that billions of images across the Web now display an error message instead of the image in question. :(
    https://barrreport.com/threads/attention-photobucket-users.14377/
    Dismiss Notice

accuracy NO3 test

Discussion in 'General Plant Topics' started by yme, Jul 24, 2006.

  1. yme

    yme Lifetime Charter Member
    Lifetime Member

    Joined:
    Nov 30, 2005
    Messages:
    624
    Likes Received:
    4
    hi tom,

    You probably (still) know that I have a hanna c205 photospectrometer and that the NO3 readings are far from accurate. To improve the accuracy of the test I started thinking:

    -Fe influences the NO3 readings (manual hanna)
    -I add flourish iron and flourish that contain iron
    -perhaps the Fe in these products influences the readings
    -active carbon binds chelators
    -active carbon can therefore remove the Fe in the water
    -active carbon filtered water can improve the accuracy of the NO3 test????

    to test this hypothesis I took a liter of aquarium water and measured the NO3: 20 mg/l. Then, I added one drop of flourish and one drop of flourish iron. Then I measured the NO3 again: 40 mg/l! flourish and/or flourish iron clearly influences the NO3 readings....
    Then I added a spoon of active carbon and added an airstone to the bottle to get the carbon swirling in the water. after 45 minutes I measured the NO3: 25 mg/l. after 3 hours I measured it again: 16 mg/l. So clearly the active carbon influences the NO3 readings as well.

    So my question to you is now: what do you think about this method? does it improves the accuracy of testing or do you get other artifacts. I can for instance imagine that when you let the water stand for 24 hours, that the NO3 readings are different anyway.


    And are the drop tests influenced by iron in the same way?

    greets,

    yme


    *still having bga, but fighting it hard :D *
     
  2. yme

    yme Lifetime Charter Member
    Lifetime Member

    Joined:
    Nov 30, 2005
    Messages:
    624
    Likes Received:
    4
    Re: accuracy NO3 test

    after 24 hours, the NO3 concentration is 18 mg/l. sounds to me like this method might be working.....

    greets,

    yme
     
Loading...

Share This Page