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Old 10-08-2006, 01:20 PM   #41 (permalink)
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Tony, I'd be interested in helping you figure out what's in it. I might grab a bottle sometime and run GC-FTIR-MS on it...unless you beat me to it. =P
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Old 10-11-2006, 03:30 PM   #42 (permalink)
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Show-offs

Well that online source really paid off, so to speak. I ordered the 450ml of 25% biological grade gluteraldehyde on Friday around 4:30. It cam today, Wednesday, before noon. The total with shipping was 21.95, so about $6 shipping. That will equal 4.5 liters of 2.5% solution, at $4.88 a liter. If I dose 7ml a day this will last me almost 2 years Not bad.

Thanks for pointing out this source!!!!

Since I have riccia as a major part of my scape, I think I will start around .1mg/l and see what the results are like. For my application, my 29 gallon aquarium (actually 25 gallons) is equal to 94.5L. Making a 2.5% solution by adding 10ml 25% gluteraldehyde to 90ml H20 and dosing 5ml of that solution will give me .13mg/l in my tank. This is convenient since I have a used 100ml Flourish Excel bottle laying around. Also useful since I can do a half dose to my 15 gallon for the same concentration.

I'll post when I am able to see results, either good or bad.
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Old 10-11-2006, 03:31 PM   #43 (permalink)
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Looking forward to your progress reports, Dennis.
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Old 10-12-2006, 07:26 AM   #44 (permalink)
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Awesome. Hope the riccia does well. =) I'll be checking this thread often!

Take before and after pictures, especially of the riccia. Then we can really judge the growth rate when using glutaraldehyde.
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Old 10-19-2006, 11:37 AM   #45 (permalink)
 
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any new results?
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Old 10-22-2006, 04:05 PM   #46 (permalink)
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Quote:
Originally Posted by epicfish View Post
Assuming the 2% is weight-by-volume: 2% w/v = 2 grams / 100 mL

30 mL in 60 gallons:
(2 grams / 100 mL) * 30 mL = 0.6 grams in 30 mL of the 2% solution.
If you add it to 60 gallons of water, 60 gallons * 3.78 L / gallon = 226.8 L
0.6 grams / 226.8 = 0.26 mg/L
Ummm, why am I figuring this wrong?


(2g/100ml)*30ml = 0.6grams in 30 ml at 2%

0.6g/226.8L= 0.002646 g/L

multiply that by 1000mg/1 gram= 2.65mg/l

Why were you getting 0.26mg/l? Where am I doing that wrong?

Another example:
2.5% solution (what i have) is 2.5gram/100ml, or 25000mg/l.

1ml of that solution is 25mg/ml. Adding 25mg to my aquarium, ~100L, is .25mg/l for my aquarium? Is that math correct?
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Old 10-26-2006, 05:12 PM   #47 (permalink)
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2.6mg/L, I stand corrected. Thanks. =)

I multiplied by 100, not 1000.
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Old 10-26-2006, 05:36 PM   #48 (permalink)
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I did not mean to "correct" you but it was throwing me for a loop. Math and chemistry are not my best subjects so I did not realize how much a 15ml dose adds My bad. Good news is that tetras, nerites and pygmy cories can take 3.75ppm gluteraldehyde. Riccia is not to happy and BBA may be a bit grumpy but the plants and fauna are fine.
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Old 10-26-2006, 05:55 PM   #49 (permalink)
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Quote:
Originally Posted by dennis View Post
Math and chemistry are not my best subjects so I did not realize how much a 15ml dose adds
You seem to be doing fine with the math Dennis Grumpy BBA is good and I am curious as to how your Riccia does. Allen said his was starting to come back but he hasn't posted in a while to give us an update
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Old 10-27-2006, 02:07 AM   #50 (permalink)
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Quote:
Originally Posted by dennis View Post
I did not mean to "correct" you but it was throwing me for a loop. Math and chemistry are not my best subjects so I did not realize how much a 15ml dose adds My bad. Good news is that tetras, nerites and pygmy cories can take 3.75ppm gluteraldehyde. Riccia is not to happy and BBA may be a bit grumpy but the plants and fauna are fine.

How are you adding the glutaraldehyde to the tank? Maybe if you had enough riccia, you could do a few experiments.

Have thse following groups of riccia:
1) Free-floating
2) Tied to a rock closest to the area where you dose your glutaraldehyde
3) 6 inches away from rock #2
4) 6 inches away from rock #3...and so on so forth.

This way, we can see if the initial "shocking" concentration of glutaraldehyde has anything to do with its death, or if the overall concentration of ~3.75ppm is enough to do it in. If we can figure out what's actually killing it, we might be able to find a good way to dose the glutaraldehyde. ie: Maybe mixing it with new water during a WC and adding it that way, or adding it as the water flows in from a python or something similar.
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