url: http://escribe.com/health/thesilverlist/m63046.html
CS>Measuring very high ppms
From: Dan Nave
Date: Sun, 5 Oct 2003 09:16:03
> Reid,
> All things considered, since you are in Nepal and you are making
> large quantities of very high ppm CS, I think the easiest and
> cheapest way of determining the ppm of the solution would be the
> method recently suggested by Mike Monett to actually weigh the
> silver anode at the beginning and at the end of production and
> then calculate the ppm based on the weight of silver lost and the
> volume of water of the resultant CS.
> You should be able to make a large quantity of CS (several runs
> over a period of time) and combine the resultant brews and come up
> with enough silver weight loss on the anode to get a faily
> accurate calculation. Any reasonably sized town in Nepal will have
> chemists, pharmasists, or labs who would have a tripple beam
> balance which would probably give enough resolution for this. Just
> be sure to use the same balance to weigh the before and after
> weights.
> I'm sure that Mike or someone on the list would be able to give
> you formulas with which to make this calculation.
> Dan
> PS You lucky guy! I love Nepal...
Brilliant Idea, Dan. The formula is simple. ppm = mg / litre
The conversion program you posted recently would be excellent for
converting between the different units.
The newer electronic balances can measure 1 milligram in several
hundred. A good pharma distributor should have one and might let you
use it.
I'd strongly recommend using a constant current source to control
the current. Running with constant voltage will give highly variable
results due to the variations in cell conductance with changing ion
concentration.
The high current density you are using produces a high cell
resistance. With the current you are running, the voltage across the
cell probably exceeds the 37 Volt limit of LM117's.
I recently posted a high compliance current source for cell voltages
up to 160VDC that might help get the repeatability you need. Please
see
http://escribe.com/health/thesilverlist/m61896.html
http://escribe.com/health/thesilverlist/m61938.html
You will need a good heat sink to run above about 12mA.
Good thinking, Dan. You have an excellent analytical mind.
Best Regards,
Mike Monett
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