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  1. #1

    Default Beware your Nitrate test


    0 Not allowed!
    I was running low on my nitrate test chemicals so I bought a new test kit. Both old and new are API test kits. In fact the manufacturing lot number is the same on both.

    The picture shows an obvious difference in test results between the old test kit and the new. The test tube marked "old" is from the almost empty test kit. The test tube marked "new" is from the fresh just opened test kit.

    I assume I should believe the fresh test kit but I guess I should buy a third kit and do two out of three.

    I can only think that the test chemical from the bottle that says "IMPORTANT! shake for 30 seconds" changes concentration if not enough shaking is done. More dense chemical settles to the bottom and as the bottle is depleted, the solution ends up getting more and more concentrated.

    So shake that bottle well!

    -dickm
    Attached Images Attached Images

  2. #2

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    Default


    0 Not allowed!
    Wash it all out and retest!
    If you get mixed results take some to an lfs and have them test it.
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  3. #3

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    Default


    0 Not allowed!
    Looks to me like they are about 5ppm in difference. *Shrug* I wouldn't lose too much sleep over it.

    FWIW, I use Salifert Nitrate tests...it uses 2 powdered reagents.

  4. #4

    Default


    0 Not allowed!
    Do they still make the AP dry tab test kits. I always like those better than the liquid ones. I just have not been able to find them. I may just buy a HACH kit through work. Just need to find what range I want.

  5. #5

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    Default


    0 Not allowed!
    Tests will be way messed up unless those tubes are washed out several times. Any residue of a previous test will change things drastically.

  6. #6

    Default


    0 Not allowed!
    I went and bought another test kit.

    The 2 new test kits agree with each other (about 10ppm). The old nearly empty test kit reads high at about 20ppm, a 100% error.

    I guess its just something to be aware of, shake well, and I know I'm going to replace the chemicals long before they've nearly run out.

    -dickm

  7. #7

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    Default


    0 Not allowed!
    Quote Originally Posted by dmagerl
    I went and bought another test kit.

    The 2 new test kits agree with each other (about 10ppm). The old nearly empty test kit reads high at about 20ppm, a 100% error.

    I guess its just something to be aware of, shake well, and I know I'm going to replace the chemicals long before they've nearly run out.

    -dickm
    They will go bad eventually just sitting on the shelf for a year in the store. So if you can use new tests, compare them with the lfs results of the same water sample to test it. There really not many ways to test nitrite i can think of...so buy the master kits and test the ammonia and nitrate tests. Ammonia by adding it to dechlored water, nitrate from ur tank.

  8. #8

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    Default


    0 Not allowed!
    Thanks for bringing this issue to my attention. I will make sure I skake the bottle well in future and try to use the liquids up quickly.

    Jellygirl
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    There's more to fishkeeping than meets the eye.

  9. #9

    Default


    0 Not allowed!
    I dont think its an issue of going bad. I think its an issue of getting more concentrated without adequate shaking.

    If you look at the solution when you are adding drops to the test tube, the drops sink right to the bottom of the tube. They are much denser than water. It must do the same in the bottle and thus it will tend to get stronger as you get to the bottom of the bottle without adequate mixing/shakng.

    So as you use up the bottle, the concentration changes and it appears you have more nitrate than you really do.

    Thats my theory and I'm sticking to it :-)

  10. #10

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    Default


    0 Not allowed!
    Quote Originally Posted by Jellygirl
    Thanks for bringing this issue to my attention. I will make sure I skake the bottle well in future and try to use the liquids up quickly.

    Jellygirl
    And in the future get Nitrate tests with powdered reagents.

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