On 9/16/2011 12:52 AM, David AuBuchon wrote:
This need a new thread.
1. When EIS gets concentrated through evaporation, why does it turn brown?
As it concentrates the Ag2O level exceeds its solubility limit, and
deposits on the particles. Once a particle is covered with Ag2O, it
loses some of it repulsive charge, and can aggregate with other
particles forming a kind of popcorn ball, where the popcorn is the
original silver particles, and the silver oxide is the corn syrup.
2. The color being reversible when you add distilled water, what can
we say that tells us about the risk of argyria when consuming a set
mass of silver in a highly concentrated form as compared to normally?
I am not sure that says anything. Once water is added, the silver oxide
redissolves, and the particles fall apart, ending up with what you
started with. Argria is caused by the photographic process where in an
alkaline environment and a developer, such as caffeine, silver atoms
plate out from a silver compound causing a particle to grow until it
becomes caught in the tissues. There is no Ag2O in that particle.
3. If you added peroxide to EIS first, and then tried to concentrate
it, what would happen? Would the metallic particles still remain
stable?
I don't think it would behave any differently, but would be an
interesting experiment to try.
Marshall
~David
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