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And speaking of potassium...
A while back, Paul Krombholz wrote the following:
>This is very interesting. I had a chemist tell me that only
>atomic absorbtion could be used because potassium didn't form
>any colored complexes. I think it would be useful for aquatic
>plant hobbyists to be able to test for potassium as long as the
>test isn't very complex and doesn't use expensive chemicals. I,
>for one, would be interested. I know that Orion makes an ion
>selective electrode for potassium, but it is expensive and has a
>working life of only around 6 months. I wonder why the vendors
>who sell environmental water chemistry test kits don't have one
I was looking through the LaMotte web page yesterday, and guess
what I found?
POTASSIUM (order code 3138)
Sodium tetraphenylboron reacts with potassium to form a white
precipitate. The turbidity of the solution is proportional to
potassium concentration which is measured in a calibrated tube.
Range: 6, 8, 10, 20, 30, 40, 50 ppm K+
This range is quite high, I think, but does anyone think it's at
all useful at the low end? I have no idea what the price is.