As always, Frank Key is a priceless resource for those of us with
limited scientific experience.
NB that the methods below would conceivably enable even a layman to
decant nearly pure ionic/colloidal solutions. Seems to me that in the
freezing method, for example, one could confirm the dense concentration
of particles at the bottom of the container using a laser, and gently
decant to keep those particles in the bottom. Those who believe that
the particles are superior, or wish to mix particles with other
substances -- bloodroot would be an interesting experimental substance
-- could readily do the separation without high-tech tools.
Thanks, Frank! Very generous. Please correct me if I have
misunderstood anything here.
JBB
On Sunday, May 30, 2004, at 09:56 Asia/Tokyo, Frank Key wrote:
JOH wrote:
That gives total Ag in any sample; how do you separate them?
To separate the ions from particles in a colloid by the following
methods:
1. Ultra-centrifugation - 350,000 G-forces for 15 minutes will separate
particles down to two atomic diameters leaving only the ions. Decant
off the
ionic solution and measure by atomic absorption/emission spectroscopy
to
read the ppm of the ionic content.
2. Freezing - freeze the colloid to a solid block of ice, then thaw.
The
particles will fall to the bottom leaving only the ions. Decant off the
ionic solution and measure by atomic absorption/emission spectroscopy
to
read the ppm of the ionic content.
3A. Precipitation - the ions can be precipitated into silver chloride
by
adding a drop of diluted hydrochloric acid. Let sit for a day so the
silver
chloride settles out leaving only the particles, or separate the
precipitate
using a centrifuge. Decant off the silver colloid and measure by atomic
absorption/emission spectroscopy to read the ppm of the silver
particles.
3B. Precipitation - same as 3A but using sodium hydroxide to
precipitate the
ions out as silver hydroxide.
Frank Key
Colloidal Science Lab
http://www.ColloidalScienceLab.com
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