Steve, Sharon, I believe that a conductivity meter can indeed reliably test for silver concentration in colloidal silver solutions, within certain parameters. The preliminary testing I have done shows very good correlation with silver tested by other methods, as long as the sol is clear or yellow and contains no large particles as shown as discrete sparkles in the Tyndall beam of a laser pointer. This applies to new CS batches I have tested, and batches over a year old.
More testing to do, but results look encouraging. TDS meters can also be used, but one needs to know the TDS correcting factor of the meter, and will still need to do some mathematical correcting. Meters that read in uS (micro Siemens) are far easier to use. Ivan. ----- Original Message ----- From: Steve King <[email protected]> To: <[email protected]> Sent: Wednesday, 3 November 1999 01:11 Subject: Re: CS>Measuring ppm? > Sharon- > > >The general consensus here on the list is that the TDS meter does not > >measure ppm. Do you feel differently about that? > > Yes I agree. I think its very difficult to correlate silver > ions or very small particles with various charge levels > to PPM. The whole discussion about TDS and PWT > relates mainly to water purity before the process. The > meters also work after the process and show change in > conductivity but what the measurements mean I have > no idea! -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
