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Old 03-24-2014, 05:31 PM   #61
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SCIENCE!

Sent from my SGH-M919 using Aquarium Advice mobile app
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Old 03-24-2014, 06:28 PM   #62
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Wow you've even got the test tube holder going!!! Professional!! :P
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Old 03-24-2014, 07:12 PM   #63
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Here's the spectrum

OTC represents "off the chart". You can see that there IS a color DARKER than 8.0. Specifically in this test "off the chart" is 16ppm.
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Old 03-24-2014, 07:13 PM   #64
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Here's the spectrum

Nice web link
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Old 03-24-2014, 07:30 PM   #65
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OK here's an additional post that's kind of a bummer.

That middle vial is a grab from the cycling tank (diluted as normal). When compared directly with a 2 or 4 vial, it's definitely not as I had thought. It doesn't appear to differ much from 4 after all.

I had thought it was distinctly lighter than my initial tests from the tank. But I'm noticing that in the absence of a "control" this is really impossible to estimate from day to day. I would say that this potentiallyy makes my early ammonia readings, where I thought it had dropped, invalid.

pH and kH drops are not invalid however.

Also, to increase reliability of future readings, I have made a "control solution" which is 4ppm. I will now run 2 ammonia tests each time I test the cycling tank, using both the tank water and the control. Then I should be able to compare these more accurately and properly identify if the tank is reducing ammonia.
I can also dilute my control solution as needed to control for any other lesser ppm.

So, not the best news. But it did seem too good to be true.

If the tank is not reducing ammonia though -why are the pH and kH dropping?
Perhaps I added slightly more than 16ppm to begin with, and it is now slightly under? I think there is a potential error range of 1-2ppm ammonia. I think there is not going to be definite information until the tank has CLEARLY reduced at least into the 1-2ppm range.
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Old 03-24-2014, 07:43 PM   #66
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Just throwing this out there for fun Will make a nice addition to your lab
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Old 03-24-2014, 08:00 PM   #67
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WOW!!!!

...... my lab wants a colorimeter so badly.....

Thanks for sharing, that is amazing.
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Old 03-24-2014, 09:29 PM   #68
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I wonder if the bacterial bloom has been adding some ammonia?
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Old 03-24-2014, 09:34 PM   #69
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This seems to prove that amounts higher than the max on the chart don't give a false zero.
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Old 03-25-2014, 12:43 AM   #70
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This seems to prove that amounts higher than the max on the chart don't give a false zero.
I'm still not 100% convinced. Thren's awesome experiment and the "OTC" reading was for ammonia and I was referring to Nitrite. The color references for Nitrite posted by Rare, which was an awesome find, only goes up to 2ppm. That said, it occurred to me that Dr. Hovanec doesn't disclose the Nitrite concentration he used in that experiment. So I think this is something I will dig into a bit further. Maybe an email to API to see what they have to say about it.

Sorry Thren...didn't mean to hijack your thread with my rambling thoughts!
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