James wrote: > According to folks who have tried, a TDS meter---in reality a very > low range meg-ohmmeter calibrated to read in micro-Siemens or TDS-is > not usable to determine conc. of Ag sol.
The TDS meters from Hannah are indeed *conductance* meters. They *are* usable to achieve consistancy from batch to batch, and as an indirect measure of (approximate) concentration. You simply have to ask: Is conductivity related to concentration of CS particles in any reproduceable way? The answer is yes. It is likely a very *complicated* relationship, however, so you cannot just read the meter directly. But, you can probably create a calibration curve that would work for a limited set of process conditions. The real value is that, once calibrated to a salt or calcium chloride standard, then any two of us can set up the same production environment, process to a certain conductance reading, and be able to expect we're in the same ballpark of useful ppm. (PROBABLY!) If *I've* properly analysed my product, you can now have reason to hope that *your* product is approximately the same. Again, it isn't necessarily an *accurate* tool, but it's reasonably precise and reproduceable, and therefore useful for certain things. Be well, Mike D. [Mike Devour, Citizen, Patriot, Libertarian] [[email protected] ] [Speaking only for myself... ] -- 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]>
