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Using RO water to do analysis

Discussion in 'CO2 Enrichment' started by Gbark, Apr 12, 2010.

  1. Gbark

    Gbark Guru Class Expert

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    Hi all,

    Some of you are helping me on another thread about Nitrate levels, but i thought i should start a new one for this.

    I have just received my new Nitrtate test kit. It measures from 0-15ppm as N

    It works by putting 1ml of the test solution into a measuring cylinder, adding 20ml deionized water and then the test agents. Mix and leave to stand, then take 10ml of this solution add a tablet that gives it a colour and then compare.

    Well i have been using RO water instead of deionized water.

    Today i bought some deionized water from the store and i have done some tests on my water's

    I sampled my tank and mixed with my RO water and got a reading of 6ppm N
    I sampled my tank and mixed with Deion water and got a reading of 1ppm N
    I sampled my RO water and mixed with Deion water and got a reading of 0ppm N

    How does this work, it looks like i get a false reading with RO water even though my RO water contains no NO3
     
  2. Biollante

    Biollante Lifetime Charter Member
    Lifetime Member

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    Test Stuff

    Hi Geoff,

    What brand of test kit are you using?

    Is this a Cadmium reduction method, followed by Nitrogen-Ammonia/Ammonium salicylate method?

    Biollante
     
  3. Gbark

    Gbark Guru Class Expert

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    Its from a company called palintest. (i could not get the lamotte test kit)

    We have talked in another thread and we know my RO does contain a small amount of Nitrate.

    is it possible that when i add the 19ml of RO water to the 1ml tank sample that the nitrate reading is increased by 19x
     
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