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Old 10-24-2020, 10:42 AM   #11 (permalink)
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Default Re: Plants and Ammonium

Hi Everyone,

Quick Update



Nitrite measured at 1315 today. It is a tad less than 0.1 ppm - so it hasn't changed since yesterday. This comes as a bit of a surprise. The ferns appear to be fine - I will attach a photo in my next post. Water temperature is 25.7C +/-0.2C. I didn't see much point in measuring either ammonia or nitrate at this stage based on the above nitrite figure. Nothing was added to the tank today.

I am unable to measure PAR for the lighting. But, a rough-and-ready check of the spectrum indicates a decent amount of red light, plenty of blue light and much less green. The dominant wavelength appears to be around 450nm. I do have a spectrometer but it's a bit of a pain to set it up. Compared with my other tanks, the light I'm using appears quite bright to my eyes. It is an LED unit that I removed from an Aqua One 30 litre tank. The tank that I currently have the ferns in is a mere 12 litres and is only 20 cm depth.

I realize that my posts will probably be of no interest to most people but I am presenting this data in the hope that Diana Walstad may find time to add any comments.

Yorkie

P.S. Is there a way of including a member's name in a post with the suitable prefix that will alert the appropriate member to the post?
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Old 10-27-2020, 09:00 AM   #12 (permalink)
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Default Re: Plants and Ammonium

Hi Everyone,

Two days ago (25/10/20), I added NH4Cl to raise TAN to 1.5 ppm as measured by the JBL 'NH4' test kit. Yesterday (26/10/20), TAN measured 0.4ppm, NO2 measured 1 ppm and NO3 measured between 5 and 15 ppm. Water pH is around 7.3.

I have calculated NH4-N (TAN), NO2-N and NO3-N at the outset and at the end of this exercise. These three parameters total approx. 1.4 ppm in both cases. So, the plants don't appear to have taken up any of the ammonium. Instead, the ammonium appears to have been oxidized to nitrite and nitrate. I conclude that nitrifying bacteria may have effected this oxidation. This is despite my best attempts to eliminate nitrifying bacteria in this tank. As the tank was scrupulously cleaned with KMnO4 solution beforehand (including dipping the plants and the wood to which they are attached) plus the use of UV-C sterilization of the water column, this is not what I had expected. The tank is also illuminated during the day and light is known to inhibit the growth of nitrifying bacteria. There is no substrate.

I need to take a break right now to give my grey matter a rest.

Hope to be back later today. In the meantime, if anyone spots any errors in my reasoning, please let me know.

Yorkie
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Old 10-27-2020, 09:26 AM   #13 (permalink)
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Default Re: Plants and Ammonium

1.5ml/L of H2O2 might work reduce any bacteria in the tank but safe for plants.
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Old 10-28-2020, 10:35 AM   #14 (permalink)
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Quote:
Originally Posted by mistergreen View Post
1.5ml/L of H2O2 might work reduce any bacteria in the tank but safe for plants.
Hi mistergreen,

That's good to know. Thanks for your feedback.

Yorkie
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Old 10-29-2020, 11:51 AM   #15 (permalink)
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Default Re: Plants and Ammonium

Correction. it's 1.5ml/Gallon of 3% H2O2. 1.5ml/L is be too strong for livestock, and some plants.
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Old 10-29-2020, 12:56 PM   #16 (permalink)
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Quote:
Originally Posted by mistergreen View Post
Correction. it's 1.5ml/Gallon of 3% H2O2. 1.5ml/L is be too strong for livestock, and some plants.
Thanks for the update.

Yorkie
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