[APD] KH standard

[Paul M Wallace <pwallace at u_washington.edu>]

Chris:

You are discribing the "bucket test" of a KH kit.  Start with a known volume of water with no detectable KH (DI) and add a known quanity of sodium bicarbonate and make SURE that the test kit gives the right value.

For example:

"One teaspoon (about 6 grams) of sodium bicarbonate (NaHCO3) per 50
liters of water will increase KH by 4 degrees and will not increase
general hardness.  Also, two teaspoons (about 4 grams) of calcium
carbonate (CaCO3) per 50 liters of water will increase both KH and GH
by 4 degrees."

I will go looking for better values etc...

> Chris wrote:

> Now the mention of a KH refrence sample is very interesting. Can one be
> made with say a saturated solution of  Sodium Bicarbonate? Or, a known
> volume of water and weight of NaHC03 with a KH reading fixed to it.


> Thomas Barr wrote:
>
>> Now KH test kit variance is one issue, making a reference standard to compare you KH test to is a very WISE idea to check the accuracy. I've seen many folks have very high CO2 predicted levels, yet fish were fine, but another than has barely 30ppm and the fish are gasping. It cannot be that both are at the same CO2ppm level becaused we would expect to see the same behavior from the fish. Instead we see very wide ranges and impacts on the fish(as well as plants).



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