Study: Nitrates and other parameters in Amazon waters

[jcardona1]

mg/L = ppm

Btw I wonder where all the nitrates go?

Yeah I know that. But the uM confuses me, since it's based on that compound's molecular mass. And almost everything is measured in uM.

With nitrates, their not stagnant bodies of water like aquariums. It's like a big constant water change. The 'current' that each river has is ultimately carrying that water to the ocean. Fresh water comes from the rains

 

[dayak]

i wondered when the data is taken out of the session?
they do have approx 6 months pouring rain and 6 months dry session which is very humid.
i noticed it "revised" in november of 2008, if thats when the data is taken..it is their peak of rainy session

 

[jcardona1]

i wondered when the data is taken out of the session?
they do have approx 6 months pouring rain and 6 months dry session which is very humid.
i noticed it "revised" in november of 2008, if thats when the data is taken..it is their peak of rainy session

The study says:

Samples have now been collected on
13 different cruises (1982-1991) during contrasting hydrographic stages.

That tells me the readings were taken at all water levels, low and high, rainy season, and dry.

 

[dayak]

after analyzing the data provided from those years which is like about 20 years old data the average of nitrate lvl of the low is 3ppm and the high is 20ppm while the PH is constantly averaging within 5+ to 7+

 

[aclockworkorange]

You know, I can't even figure out the TDS levels ha! They measure everything in formats that I'm not used to seeing. All I know is mg/L and PPM I don't worry about ph because its' like chasing ghosts. Like I mentioned, I'm using RO/DI water. The water in tank is extremely soft (1-2 degrees KH/GH and TDS of 45-60ppm). Even with that, my ph is still in the mid 7s. What could it be? CO2 affecting my alkalinity? That can't be, because the RO water is aged and aerated for 24-48hrs before going in the tank. I could add acid to reach a certain ph number, but that could be potentially dangerous...

From a hobbyist standpoint, I would not recommend it at all. In wholesale, if you mess up you're out maybe $10 worth of fish you don't care about (we didn't do discus, BTW ). If you kill your own tank at home, that's a different story obviously.

Have you considered using something like peat in your filtration system?

 

[muffywrx]

This is very neat info to share TY

 

[RD.]

Singapore shipments would also come with extremely low ph.

Singapore water averages 7.2-7.8 pH. The reason that it is lower when the fish arrive is due to the DOC's & ammonia pushing it down. A friend of mine in town imports asian aros from Singapore on a regular basis, pH in the bags is typically around pH 7.4. But that's one small aro per bag, packed in lots of water.

Thanks for the links Jose.

 

[aclockworkorange]

Singapore water averages 7.2-7.8 pH. The reason that it is lower when the fish arrive is due to the DOC's & ammonia pushing it down. A friend of mine in town imports asian aros from Singapore on a regular basis, pH in the bags is typically around pH 7.4. But that's one small aro per bag, packed in lots of water.

Thanks for the links Jose.

Yes, pack a lot of fish and ship it that long, and your ph will likely plummet. But the guppy breeders in particular claimed to have facilities where they were running systems that were supposedly completely sterile and "impossible" to have any disease. Not sure the exact science on that, but my guess would be that could affect ph too.

 

[RD.]

Sounds like a bio-secure facility, but that shouldn't have any effect on pH.

 

[mcsnapper1]

In regards to the post by ceeej31, how does the nitrogen cycle continue at such a low PH? I thought it shut down when the PH drops below 6.