HI!
My name is Dennis. I've been lurking for some time now and making CS for
much longer.
Couldn't resist getting in on this one. I use a one litre beaker of boiling
distilled water , two silver medallions of 99.9+% purity measuring about 29
by 50 mm, spaced about 9.5 cm apart, facing each other, with a voltage
source of 29v which is current limited at 2mA. The
electrodes are weighed before and after a two to four hour process and the
strength of the CS calculated as mg/l or ppm,-- usually between 10 and 20
ppm. Depending on the DW used, the final result is either clear with a
faint Tyndall or pale, pale lemon with a stronger Tyndall effect. The
liquid is stored in clear glass flasks in a cupboard and appears to keep
indefinitely.( I have some made in January '99 which still has good
Tyndall)
My balance is a Christian Becker which will discriminate to 100 micrograms
so measuring
10 to 20 milligrams can be done with reasonable accuracy. Water and CS
resistivity is measured with an AC Wheatstone bridge. I'm in the process of
trying to get some correlation between a TDS1 ppm reading, my calculated
values and resistivity (or conductivity) without too much success so far,
though to expect the TDS 1 to be of much use is probably pushing it.
Hope that my input is of some interest to the group.
Dennis
