My best guess:
Free silver ions and free hydroxyl anions both contribute to conductivity
more when not associated than when they are.
It takes time for the two to find each other. [stabilization]
After stabilization, there are few, if any, free ions or anions.
Part of it may also be a temporary super saturation of silver oxides in
formation or before/as crystals drop into suspension.
This idea appears to be confirmed by the fact ..if the water is run
through a small tube as the generator runs, conductivity drop is greatly
reduced as ions and anions are forced into close proximity inside that tube.
In my setup, I also add a little heat from a 4 watt light bulb which may
help the reaction along. [7 watts is sometimes too much]
I call it a thermal updraft velocity enhancer, channeler...or chimney.
[or inverted funnel, which is what it is without the fancy names]
I came up with that to get thermal convection stirring to work better in
taller containers and lo and behold...conductivity drop was also reduced to
almost nothing regardless of whether it was a pint or a quart batch size.
The amount of conductivity drop is also related to the size of the batch.
Larger batches drop more.
My guess from your numbers is that you made a quart batch.
I have found and confirmed with AA Spectrophotometer testing that
conductivity numbers only relate to PPM numbers 'AFTER' it has stopped
dropping.
Going over 25 to 30 uS gets you into an iffy energetic anomaly area where
Ohms law doesn't quite add up.
It's probably due to super saturation of both silver hydroxides and
silver oxides where the loss of energy is going into crystal formation.
The solubility limits of each are around 13 PPM which adds up to 26.
BUT, I have been able to go as high as a stable colorless 79 uS, so
something else is going on too.. Perhaps silver peroxides and/or silver
tetroxides?
Further complicating matters is the fact that conductivity isn't PPM.
Under certain conditions in the 5 to 20 PPM range, the numbers are the
same [or at least very close], but they still aren't the same thing.
Using a meter in ranges over 30 uS probably isn't going to work very well
as actual PPM slews off towards the high side compared to conductivity.
So, that 79 uS is probably more like 90 PPM, but AA testing is expensive
and I didn't do it. [And going that high with something you'd use as a
result, is really freekin tricky and unreliable!]
Ode
At 10:42 PM 1/16/2006 +0100, you wrote:
Hi there,
I have some problem which I do not know how to explain.
If I make EIS and I make the PWT test immediately after finishing the
batch, the readout is e.g. 34 microSiemens.
If I repeat the measurement after some hours, I can read about 23
microSiemens. Within 24 hours after the batch finish I can measure 16,5
microSiemens in the same batch.
Can anybody give me the explanation of this?
Thanks Pavel H.
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