question about JBL co2 test - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-22-2019, 11:04 PM Thread Starter
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question about JBL co2 test

If someone uses this test, can you tell if you are satisfied.
I brought the test kit for planted tank and inside is also the instant co2 test. I did three tests of this, with three different PH measures, 6.6 and 6.8 and 6.0 (all with my PH controller). My KH was the same 3.5. Unexpectedly I found and the three times what the chart provided says.
16 for 6.8, 24 for 6.6 and 104 for 6.0
Everything until here sounds perfect but if this is true, now in my tank I have a PH drop from 6.6 to 6.0 from injected co2 and KH 3.5. So is it possible to have 104 ppm co2 and my fish to be ok?
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post #2 of 9 (permalink) Old 03-23-2019, 05:55 AM
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Did you calibrate your pH probe?

If truly your CO2 level was 104 ppm, your fish would likely exhibit symptoms of CO2 poisoning.

Also, the relationship between CO2/pH/kH is only true if the only contributing species is carbonate. There are other species that can affect this relationship, which will cause an over-estimation of CO2.

Anthony


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post #3 of 9 (permalink) Old 03-23-2019, 09:24 AM Thread Starter
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That's why I wrote is strange, because I wonder too. I calibrated my Probe.
Is it possible to be a coincidence? This is the reason I tested it three times.
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post #4 of 9 (permalink) Old 03-24-2019, 08:40 AM
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The fact that your probe reads three significantly different readings each time led me to believe that it is not calibrated properly.

Are you doing a 2 point calibration? You may want to try a 3 point calibration to see if that fixes the precision issues you are having with the probe.

Anthony


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post #5 of 9 (permalink) Old 03-25-2019, 04:08 PM Thread Starter
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no no my probe is fine. When I spoke about different ph values I ment by injecting my co2 and my PH drops due of the co2.
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post #6 of 9 (permalink) Old 03-25-2019, 07:15 PM
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I can't make sense of what you are saying.
What is your tanks degassed ph value?
What is your final CO2 ph value just before you shut off your CO2 after the photoperiod?


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post #7 of 9 (permalink) Old 03-26-2019, 08:27 AM Thread Starter
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At 13:00 my co2 starts to inject in the tank. At this point my ph controller sais 6.8. At 15:30, half hour before light turn on, my ph controller sais 6.0 which is my lowest value. So i did the test these two times and another one when i saw my ph at 6.6.
My degasseed ph is around 7.0.
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post #8 of 9 (permalink) Old 03-27-2019, 03:34 AM
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Quote:
Originally Posted by Darkblade48 View Post
The fact that your probe reads three significantly different readings each time led me to believe that it is not calibrated properly.

Are you doing a 2 point calibration? You may want to try a 3 point calibration to see if that fixes the precision issues you are having with the probe.

I think you may have missed it, but it read differently each time because the ph was different each time. The co2 looks expected.


I think he's just asking if that is safe now that he knows how much co2 is in the tank, which is different than the question he posed as the title.
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post #9 of 9 (permalink) Old 03-27-2019, 04:00 AM
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Quote:
Originally Posted by fitos100 View Post
At 13:00 my co2 starts to inject in the tank. At this point my ph controller sais 6.8. At 15:30, half hour before light turn on, my ph controller sais 6.0 which is my lowest value. So i did the test these two times and another one when i saw my ph at 6.6.
My degasseed ph is around 7.0.
Your calculated degassed(starting) pH from kh=3.5 should be 7.55. If your tap water is only 7.0 than something is lowering it already and you can't rely on the Tom Barr ph/kh/co2 chart.

Your 1 point drop(7.0 to 6.0) is likely somewhere in the ballpark of 30ppm CO2 or less.


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