At 11:38 PM 7-27-98 -5, Mike D. wrote: > > We could save some money and get quicker results if some of us > could do our own ppm testing. Here's a couple of ideas I'd > like to discuss and, hopefully, refine enough to make work.
Mike, My understanding is that ppm testing is only meaningful if the particle *size* is in the desired range. If true, CS particle size testing would need to be done first, or in conjunction with, the ppm testing. I think this requires access to electron microscopy, or a similar accurate test. (How much does a surplus electron microscope sell for ?) Of course, the purity issue is a third parameter involved. > ---------- > Another problem is knowing the exact state the silver is in > when you're weighing it. Is it pure silver? Silver oxide? > [....] > > Which brings us to the *other* possibility, which is an > entirely chemical assay that uses pH or some other > characteristic with reagents and an indicator to standardize > and visualize the reaction and allow you to measure the > silver present by quantity required. With regards to 'purity', some types of analytical chemistry testing should be able to determine which types of silver compounds are present. (Some type of spectrography should work, also.) If several silver compounds are present (mixed together), there is also the issue of the need(?) for determining the amounts (ppm) of each. I believe it should be a priority to find a CS production protocol to minimize or entirely eliminate any unwanted compounds, regardless of their characteristics -- while being able to do a simple check of the 'overall' CS purity. Then we'd be able to do our two main tests for CS ppm and (the range of) CS particle sizes. > ---------- > If anyone knows a chemist who could help us with that it > could save us a lot of effort. Maybe Bruce Marx <[email protected]> would be willing to share some insights from his experiences in testing his HVAC colloidal silver. He has some useful info at: http://csprosystems.com/TechNotespg.htm We could collect a concise list of questions for Bruce. --Bill > > So here are some ideas. If I've convinced you an in-house > ppm test would be useful, I hope you'll help me get one of > these ideas working, or suggest another. > > Be well, > > Mike D. -- 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]>
