That is an interesting experiment Bob.
You didn't say how long it took to do the two brews.
It appears that it took 35% more energy to complete the first brew with
the plate cathode. If the electrolysis of the silver is consistent, as
implied by the Faraday equation, then the plate cathode cell took 35%
more silver to make about the same amount of ionic silver. That means
that an extra 35% silver is either plated out or agglomerated somehow so
that it is not measurable as silver ions...
Dan
Robert Berger wrote:
Greetings listers,
On April 28 John McLean posted about making 5 gallons of EIS in 8 hrs.
using a modification of my book's layout on pages 29-30, by using a
large flat cathode instead of the rod. He obtained a reading of 25 uS/cm
with a TDS meter. What is missing is the TDS reading after 15- 20 hours
as the conductive always drops.
This work inspired me to verify his protocol, so I made a brew using a
flat cathode of the same size as the anode and spaced at 3". Then I
repeated the experiment by making a run using the book protocol of 1/4"
rod cathode. I used 45 volts to shorten the time.
EXPERIMENTAL DATA:
Flat cathode:
Initial DW conductance = 1.1 uS/CM; Cfinal = 20.2 uS; C18 hrs = 18.0 uS/cm
Initial current = 9.8 mA; final current = 61.2 mA.
Silver Ag+ = 11.66 ppm as measured with my spectrophotometer.
Energy input in watt-hrs = 3.798
1/4" rod cathode:
Initial DW conductance - 1.1 uS/cm; Cfinal = 20.1 uS; C17 hrs. = 17.0 uS/cm
Initial current =3.6 mA; final current = 36.2 mA.
Silver Ag+ = 13.2 PPM (Spect.)
Energy input in watt-hrs = 2.796
Based on these two brews the flat cathode is unacceptable.
The problem with using a TDS is the loss of sensitivity at the zero end.
I replaced my TDS with a PWT.
"Ole Bob"
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