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Experiments with Peat Moss
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15-09-2003, 10:04 PM
Jim Seidman
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Experiments with Peat Moss
) wrote in message om...
The humic acids are keeping the pH
depressed and you are adding something _other_ than CO2 to lower your
pH. Then the KH/pH/CO2 table does not work well.
Tom, this may be nitpicking, but...
The relationship between KH, pH, and CO2 works regardless of what
other acids or bases may be present in solution. Humic acids,
phosphate buffers, etc. won't change this.
The problem is that very few tests directly measure KH (i.e. carbonate
hardness, the amount of HCO3- and CO3-- in solution). Most tests
instead measure alkalinity by means of titration. These kits will not
report an accurate KH if there are other chemicals contributing to
alkalinity.
So it would be much more accurate to say that the KH test kits don't
work well, than to say that the table doesn't work well.
- Jim
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Experiments with Peat Moss