I tried posting this once but if it posted it did not echo back to me.
Jim,
Actually I got interested in this after two posters here expressed an interest
in lab testing of their CS. At least one using HVAC. Curious of what lab
testing costs, I looked around for labs. Frank Keys appears the best, Sovereign
Silver's lab appears questionable and costs may be lower at a university lab
but I wondered if they would do a good test. So I started looking to see if one
could do it cheaply at home including particle size distribution. It appears
that you can with only an old spectrophotometer.
Having learned more about measuring CS from Marshall and others, I think one
could measure ppm accurately with a homemade colorimeter using an LED and a
photodetector and making your own cibration solutions.
I do make EIS but I also make silver citrate (SC) at a relatively high ppm. The
SC uses a fairly high current due to the low resistance of the citric acid
solution and there is no ionic silver since any silver ions bond to citrate.
Currently I uss the Herx Farady Calculator for estimating the ppm of the SC.
Much of what I am doing is more educational than necessary although I thought
that if I found inexpensive ways to measure ppm accurately and possibly
particle size distribution some few others might be interested in the results.
Nothing I am doing is new but it is low cost that I am looking for. Certainly I
won't duplicate Frank Keys capability but it should be quite sufficient in my
opinion.
Thanks,
Steve N
Posted by Jim Meissner:
Dear Steve:
I am wondering what the purpose of your questions are?
If you are looking for a way to measure the colloidal silver you are making,
then I have a suggestion. Very likely you would be making ionic silver with
a very small percentage of particles. In that case the $60 Hanna PWT, pure
water tester, works extremely well for testing ionic silver. In the case of
my nano silver generator the calibration of the PWT in uS is exactly the
same as PPM, 15 uS is 15 PPM. I think it is a fortuitous accident that the
readings agree.
So far as I know there is no easy way to test particles. Very few people
are able to make particles so there is no need to test that for the average
home made colloidal silver.
Frank Key tested my silver with his fancy $300,000 machine. You had asked
about calibration. I watched the testing and asked a few questions. It
seems that you feed (1) pure distilled water, then (2) a certified
calibration solution and then (3) the silver solution to be tested. The
system automatically does this sequence three times and averages the
results. It looked like a plasma source burned the solution and then the
spectrometer measured the peak amplitude vs. frequency.
See the test reports done by Frank Key on my generator
http://meissnerresearch.com/products/silver-generator .
Jim Meissner
