Norton, Steve wrote:
Thanks Marshall,
That helps. The info online relative to colorimeters does mention
digesting substances but I was unclear on how that might apply to silver
measurement. There are old manual, analog meter, Hach colorimeters
available for a low cost on eBay. Any reason they would not work? One
could replace the analog meter with a precision resistor and a digital
multimeter and probably gain some accuracy for a very low additional
cost.
They should work, if you have the proper reagents. Mine is digital and
computer controlled, so it does all the work itself as far as
calibration, picking the right frequency, and figuring out the
concentration of silver.
The spectrophotometers allow you to vary the wavelength of the light
used. Does varying the light wavelengths and measuring the light
absorbtion at each wavelength provide particle size distribution
information? At least a rough estimation? Again, there are old manual,
analog meter, spectrophotometers available for a low cost on eBay and
one could make the DMM modification.
Yes, it is quit good for assisting in particle size distribution. The
unit I have prints out the curve of amplitude of absorption vs
wavelength from the infrared through the uv range.
Marshall
Thanks for your help,
Steve N
-----Original Message-----
From: Marshall Dudley [mailto:[email protected]]
Sent: Thursday, December 18, 2008 7:01 AM
To: [email protected]
Subject: Re: CS>Measuring CS with a spectrophotometer or colorimeter -
need help
Norton, Steve wrote:
>From what I can gather, to measure ppm with a spectrophotometer you
must measure a solution with a known ppm first. You then measure the
unknown solution and then using a formula you can calculate the ppm of
the unknown solution. If you have multiple known solutions of CS of
different ppms, you can plot a conversion chart that gives more
accuracy than the formula. Is that correct?
Does the colorimeter use the same methodology?
That Hach unit I have is calibrated, so you do not use a solution with a
known ppm. You put in a control, which is the same distilled water that
the CS was made from, and let it run the baseline, then put in the one
with CS in it, and it displays the ppm directly. However all the silver
must be digested first, using nitric acid.
Marshall
Thanks,
Steve N
-----Original Message-----
From: Ode Coyote [mailto:[email protected]]
Sent: Monday, December 15, 2008 4:28 AM
To: [email protected]
Subject: Re: CS>testimony of nutronix silver ceo
Find a lab that has a flame spectrophotometer and knows how to use
it.
The Hach Colorometer [like Ole Bob had] works pretty well
Titration processes normally used in water analysis are wildly
inaccurate at 10 PPM.
Ode
At 10:15 PM 12/14/2008 +0005, you wrote:
Hi Mike , What ppm did your samples come back at thanks Ted
Lordy, Ted, that was years ago and the process I used then bears no
resemblance to what we do today. I think they were in the mid 20's,
but
the brew was made with heated water and was the color of ale! Nor do
I remember what process they used to do the test, though I think I
knew at the time.
The point of me mentioning it was that it's a way to get your product
tested locally. Environmental testing is available most places there
are industrial activities generating effluent, and the local labs
that do it can probably be found in the phone book if you look for
them.
Tell them you've got a few to a few tens of ppm of silver in clean
water and wanted to know its concentration. Ask them what testing
processes they might have available for that, how much they cost, and
whether they'll detect both dissolved (ionic) silver and neutral,
insoluble, or particulate forms.
It's not something I'd do very often, and who knows what kind of
prices
you'll find when you look -- I'm sure they'll vary widely depending
on the lab -- but if you want to "know" what you're getting it's an
option.
Be well,
Mike D.
[Mike Devour, Citizen, Patriot, Libertarian]
[[email protected] ]
[Speaking only for myself... ]
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