Nitrate checker question

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Kris 2020

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I have the or nitrate checker, and several tests I’ve had this issue. I will run a test, and get the blinking 5.00. So I run another test with dilution, and like today I get a reading thats say 4.4 (.44 prior to the x10). I’m using seachem seawater calibration solution to dilute because I’m not sure what else would have a nitrate of zero. I think 3 times now I‘ve gotten the blinking 5 but then get a diluted result below 5.00.

help? Thoughts?
 

MrTaleb

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What's the problem? If it's reading 4.4 after dilution then your nitrate is 44. Each dilution dilutes it by a factor of 10
 
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Kris 2020

Kris 2020

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What's the problem? If it's reading 4.4 after dilution then your nitrate is 44. Each dilution dilutes it by a factor of 10
No, it reads .44 after dilution, for a reading of 4.4. i expect it to be above 5, since the non diluted sample flashed 5.
 
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