> Date: Fri, 25 Apr 2003 16:58:33 -0500
> From: Robert Berger <[email protected]>
> To: silver-list <[email protected]>
> Subject: CS>It's location and ??
> Hi there EIS'ers,
> I put together a 2 gallon system for Rich Adams and ran the first
> batch here; 7 hrs. yields 35.2 PPM with current pegging the 12.6
> ma limit of the constant current regulator.
> Rich took the unit home and ran 4 batches from 6.5 to 8.5 hours
> and never had a current greater than 6.5 ma !!!!!!!!
> I brought the unit home and ran 6.25 hrs.. and had 12.5 ma !!!!
> An other interesting difference is that my first run was 35.2 PPM
> and the second run was 10 PPM????
> Location could be #1 but what changed the PPM?? I have seen that a
> number of times before with the same setup???
> "Ole Bob"
Hi Robert,
My guess is Rich's water may be purer than the water you use, or
much colder.
I'd measure the initial current when voltage is first applied and
see if there is a difference between your results and his.
I've measured the current rise, and it is very close to an
exponential:
I = e^(t + const)
The constant is the initial current due to impurities in the water.
This decreases with temperature.
With the low voltage you can apply from a LM117, the initial current
determines how long it takes to get into current limiting.
If the water is very pure, or very cold, the initial current will be
low.
If so, much of the time will be spent on the exponential rise, and
not in full current limiting.
If you integrate the current over time, fewer total electrons are
passed through the solution, and from Faraday's law, fewer silver
atoms are removed from the anode.
This could explain the difference in ppm.
One solution might be to seed the batch with 10% from a previous
batch. This will increase the initial current and get the system
into full current limiting much faster.
Let us know if you find the solution!
Best Regards,
Mike Monett
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