Accuracy Of Api Test Kits

Discussion in 'Advanced Freshwater Aquarium Topics' started by w3amz, Aug 26, 2018.

  1. w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    Has anyone measured the accuracy of API test kits against professional grade lab kits? Ammonia, Nitrites, Nitrates?

    First time I'm using the API test kits. I used another brand previously and I have this example:

    Water read 0.25 ppm nitrites, then I did a 25% water change. 3 hours later I ran another sample and it measured 0 ppm nitrites. That of course is not possible.
     
  2. Iverg1

    Iverg1Well Known MemberMember

    Messages:
    1,555
    Gender:
    Female
    Location:
    Minnesota USA
    Ratings:
    +655
    Experience:
    1 year
    Sometimes you have to shake it really hard
     
  3. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    We take each test twice and this has been repeatable. All test procedures are strictly followed. It seems there's no resolution around color changes around <.125 ppm. Nitrites at <.125ppm can be lethal. This basically makes this test kit worthless for most sensitive fish species is what our tests with it are suggesting..
     
  4. Iverg1

    Iverg1Well Known MemberMember

    Messages:
    1,555
    Gender:
    Female
    Location:
    Minnesota USA
    Ratings:
    +655
    Experience:
    1 year
    Wait so is this API or other brand? And what is the other brand?
     
  5. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    In comparison of API Nitrite Test Kit to LaMotte Nitrite test kit. We ran out of reagent. LaMotte goes down to 0.05 ppm NO2. We are suspecting the nitrite low level resolution on API is very poor.
     
  6. Iverg1

    Iverg1Well Known MemberMember

    Messages:
    1,555
    Gender:
    Female
    Location:
    Minnesota USA
    Ratings:
    +655
    Experience:
    1 year
     
  7. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    Again we repeat the test. 0.25 ppm measurement 30% water change walla 0 nitrites.
     
  8. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    Image attached. 0.25 ppm diluted by 30% of course is 30% less or 0.175 ppm.

    So in other words the API test can't detect 0.175 ppm nitrites! I knew something was already strange 3-4 days into the live in cycle where we couldn't detect nitrites. This suggests if our study is correct and repeatable as it is for us your fish could die of nitrite poisoning and you wouldn't have a clue with the API test.
     

    Attached Files:

    Last edited: Aug 26, 2018
  9. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    Of course no comment. Because no one has a clue this is actually going on.
     
  10. Jellibeen

    JellibeenWell Known MemberMember

    Messages:
    1,467
    Gender:
    Female
    Location:
    in between Baltimore and DC
    Ratings:
    +954
    Experience:
    5 to 10 years
    The increments are in .25 ppm, so i am not surprised it doesn’t detect an incrememt smaller than that. I am absolutely not phased by this.
     
  11. OP
    OP
    w3amz

    w3amzValued MemberMember

    Messages:
    212
    Gender:
    Male
    Ratings:
    +93
    By the time API test kit measures nitrites your fish are at severe risk of dying . That's what our study says.
     
Loading...
Similar Threads Forum Date
Question External Vs Internal Thermometer Accuracy Temperature May 4, 2019
Ph Reading Accuracy Freshwater Beginners Feb 27, 2019
Question Water Test Color Accuracy And Timing Freshwater Beginners Nov 6, 2018
Aqadvisor Accuracy Gh Kh General Discussion Mar 31, 2018
Api Ammonia Test Accuracy? Test Kits Jan 20, 2017
Accuracy of API Freshwater Test Kit vs Tetra Strips Test Kits Mar 4, 2016
Accuracy of API Tests... Aquarium Water Jul 14, 2015








Become a Fishlore Member