url: http://escribe.com/health/thesilverlist/m62980.html
Re: CS>RE: sick from cs
From: Stuff
Date: Fri, 3 Oct 2003 14:04:57
> Does anyone know what the other 97% consists of?
Mostly water and stabilizers that depend on the application. Here's
some info:
4. What are H2O2 stabilizers and will they affect my application?
Most commercial grades of H2O2 contain chelants and sequestrants
which minimize its decomposition under normal storage and handling
conditions. In some applications (e.g., copper etching or cosmetic
formulations) a high degree of stabilization is needed; whereas,
in others (e.g., drinking water treatment or semiconductor
manufacture) product purity is more important. For most
environmental applications, H2O2 stabilization does not affect
product performance.
The types of stabilizers used in H2O2 vary between producers and
product grades. Colloidal stannate and sodium pyrophosphate
(present at 25 - 250 mg/L) are the traditional mainstays, although
organophosphonates (e.g., Monsanto's Dequest products) are
increasingly common. Other additives may include nitrate (for pH
adjustment and corrosion inhibition) and phosphoric acid (for pH
adjustment). Certain end-uses - which depend on the bleaching
ability of H2O2 in alkali - utilize colloidal silicate to
sequester metals and thereby minimize H2O2 decomposition.
http://www.h2o2.com/intro/faq.html#4
Incidentally, Ken posted some good information earlier on using H2O2
to clean electrodes:
It's not neccesary to clean off the darkness..only remove the
loose stuff. The electrode just gets darkened again very soon so
scrubbing it off is pointless and you remove a lot of silver along
with it that you could otherwise use.
Also, scrubbing with the green thingie smooths the surface of the
electrode [by removing silver]
A rough pitted electrode has more surface area and lowers current
density somewhat and provides a surface for any deposits to stick
to better so they don't wind up in the water.
It actually works better if it's not smooth.
One way to remove the darkness without scrubbing is to place the
electrodes in hydrogen peroxide but only for a few minutes. H2O2
cleans them pretty fast but if you leave them in it, they'll turn
black again.
Be sure to rinse the H2O2 off with distilled water before using
the electrodes again. Allowing them to dry completely probably
does the trick too.
If you get some peroxide into your batch while making CS, all
sorts of weird things can happen.
If you have a batch that's gone yellow, as little as 4 drops of
peroxide per liter will clear it up in a few days. But don't ever
use that to start another batch.
Ode
http://escribe.com/health/thesilverlist/m60130.html
Best Regards,
Mike Monett
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