For current limited processes, wouldn't it be correct to assume that, taking
the point where current limit occurs as a reference point, the amount of silver
generated up to the current limit reference point in any case would be equal
regardless of the water used? Also, for any particular amount of time after
the current limit reference point, the electrolysis would occur at the same
rate in all cases regardless of water used, and the total ppm increase per hour
would be the same?
(Assuming distilled water within a normal range of variation)
Dan
>>> Dan Nave 08/06/03 10:08AM >>>
CS>PWT & its Limits
From: Robert Berger
Date: Sun, 3 Aug 2003 13:10:12
Greetings EIS'ers,
This will be classic Berger and may well be worth printing for history.
The PWT or Pure Water Tester has probably become the most used tool by
list members to ascertain the concentration of their silver solution.
However when used by it's self it is not adequate for the task assigned.
The addition of a series digital current meter will greatly facilitate
the process, but the combination still is not adequate to complete the
task.
The reason being for these tools inadequacy is that the DW used is not
always the same. When measuring the DW with the PWT one is measuring
the ability of the DW to carry current. One cannot buy "pure water" as
they all contain some impurities, as it was reported about a week ago,
one supplier said their DW has 0.02+ ppm of nickel and 0.3+ ppm of
copper. Also the DW will contain dissolved nitrogen gas and may well
have some CO2 gas which forms carbonic acid like soda pop. These are
process variables that we cannot control or eliminate. Water's ability
to adsorb these gases is the reason why I do not use bubble stirring as
it will affect the PWT readings.
The most sensitive measure of the DW quality is the initial current for
your particular setup. It would be most enlightening to measure the
conductance (with the PWT) and the current at regular intervals during
the brew cycle (every 1/2 hr) and plot the data. If the two data plots
are parallel each other then the PWT reading will read the Ag+ ions by
using the appropriate "fudge factor." If they divert (separate) then all
bets are off, as the "fudge factor" will change with length of brew.
Now for the caveat, the earlier Wal-Mart made at Hazelwood MO, had an
initial conductance of 2.0 to 2.5 uS/cm and for my setup the initial
current would be about 1 mA. (25 uA/sqin) and would rise slowly as would
the conductance curve.
The new W-M DW from KCKS measures about 4 to 5 uS/cm with an initial
current of about 1 mA., however the current rises very fast and the
conductance curve rose even faster. So time for a given PPM has changed!
CONCLUSION:
If you would plot the data whenever the new DW has a 10% change in
initial reading you will be able to generate a history that will allow
you to reproduce nearly the same results.
Remember "No pain no gain"
"Ole Bob"
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