On 1/21/2010 8:35:04 AM, Richard Goodwin ([email protected])
wrote:
> Does anyone know a source of info on how to make silver citrate at home?
>
> I'm not finding much useful info on the web in general, but what I am finding
> is that silver citrate, or silver citrate hydrate, seem to be more potent
> than EIS, and still non-toxic.
>
> Dick
From my archives, experimental work on silver citrate.
Names deleted, author may claim authorship if desired.
Chuck
Bacteria: Rear entrance to a cafeteria.
Archive copy follows:
------------------------------------------------------
Subject: CS>Playing With Silver Citrate
About a month ago I became interested in silver citrate (SC), aka
silver
dihydrogen citrate (SDC). There are a number of reasons for the
interest:
* It can be made in high concentrations. This has a number of
advantages
when traveling. With the 3 oz limit on liquids on air travel, 3 oz of
400 ppm silver citrate is equal to 60 oz of 20 ppm EIS. That is more
than enough for use during a trip. It would also be useful for camping
or backpacking where weight/volume is an issue. (e.g., a couple of
drops
in a canteen could purify, as in kill bacteria, questionable drinking
water) Silver citrate is available commercially as a 2400 ppm
concentrate.
* Of great interest to me is its use as an antibacterial spray. See:
http://cr.pennnet.com/display_article/310415/15/ARCHI/none/TOPST/1/MRSA-
infection-eradicated-for-14-months-With-SDC-disinfectant-in-Tulsa-County
-Jail/
The antibacterial spray is silver citrate at 30 ppm. My daughter
practices gymnastics at a gym where several girls had MRSA. The gym is
nonprofit and has treated the mats, etc to prevent transfer of
infections but this would be much safer and easier than the chemicals
they now use. More here:
http://www.silvermedicine.org/silver-citrate.html.
* It is claimed that silver citrate passes through the digestive
system
and into the bloodstream without change and that pathogens actually
consume the silver citrate as food. This could mean that smaller
amounts
of silver may still be effective in vivo.
I just recently made a batch of SC and thought I'd pass on my limited
observances so far. I started with 2 liters of a 10 percent citric
acid
solution (using distilled water). I used a 10 percent solution because
the following patent performed testing with solutions of 1, 5, and 10
percent: http://www.freepatentsonline.com/6197814.html. According to
the
patent, SC made with 5 and 20 percent solutions of citric acid are
stable during storage but with 1 percent it is not. I have plenty of
citric acid powder so I went with 10 percent for the first try.
I used a 38 VDC power supply with no limiting. My silver electrodes
have
about 7 square inches of surface area each. When I turned the
generator
on it was drawing over 1 amp! The current may have been limited by the
power supply which is only rated at one half amp. I never thought I
would need the digital multi-meter's 10 amp range for CS generation! I
moved the electrodes to a 4 inch separation, the widest my setup
allows
and reduced the size of the negative electrode until the current draw
was 650 ma. I felt the power supply could handle that. I ran it at 650
ma for 20 minutes. According to the Herx Silver Faraday Calculator,
that
should give a solution of 436 ppm silver. I figured that after some
loss
of silver to silver oxide generation, I would end up with something
near
400 ppm. The current draw did not change, that I could measure, during
the 20 minutes. I guess that the high conductivity of the citric acid
swamped any conductivity added by the silver.
As it was brewing, I was surprised at how little silver oxide I was
getting on the negative electrode. All told, I ended up with MUCH less
silver oxide than I get when making standard EIS. Aside from the
current
reading, the positive electrode clearly showed "wear" from the
generation and the solution exhibited a clear Tyndall effect. I set
the
SC aside for 48 hours. After the 48 hours there was no silver
precipitated out, it appears to be stable. There was no change to the
silver oxide. When backlit with light it appears to be very slightly
milky white. When viewed without a backlight it has a VERY slight
yellow
tinge. There is no yellow apparent when diluted to 20 ppm. The 20 ppm
also exhibited a clear Tyndall effect and the taste of the 20 ppm
solution reminded me of sour but weak lemonade.
As a 30 ppm antibacterial spray, the 2 liters dilutes to 26 liters. At
20 ppm it dilutes to 40 liters. And only requiring 20 minutes to
generate.
I have more questions now than when I started:
* Is the 650 ma too high a current? I know that some use the high
voltage of a microwave to generate CS. Is this equivalent to that?
* Do I need to balance the pH to something closer to 7.0 after
generation?
* If I add tripotassium citrate will the silver oxide go back into
solution as indicated by this patent:
http://www.silver100.com/USPatent.PDF?
* What percent of citric acid is best? If I add tripotassium citrate
after the generation, can I achieve a stable solution with less citric
acid?
Ideas anyone???
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