Fred, No, I have been consistent as far as I know. 0.57 uS / ppm is the conductance of discrete silver ions. The relationship changes from this point, depending upon the physical description of the colloid. As the colloid particles become larger, so does the conductivity reading. Where your or someone else's CS fits along this line (0.5 to >2.0 uS per ppm) is guess work unless the actual ppm is independently tested. However, if you have a clear solution with little Tyndal then it is likely to be ~ 1 to 1 relationship. If coloured with a strong Tyndal then closer to 2uS per ppm.
As I said at the outset of this discussion, conductivity measurements are only reliable within certain perimeters, but are certainly useful for batch to batch measurement and water quality testing. All I can give you is the benefit of my experience and study, but I make no claims other than to note that what I say is what I believe. I have been wrong and plain stupid in the past. Good health Ivan. ----- Original Message ----- From: "Fred" <[email protected]> To: <[email protected]> Sent: Tuesday, 18 April 2000 05:12 Subject: Re: CS>Hanna meter > Ivan, you are flipping back and forth on the uS/PPM issue - can you > define a little more your numbers vs. material tested. Below you agree > with K Watson that 1.8uS/PPM may be correct (if heavy Tyndall) or as > low as 1uS/PPM (if not heavy?) yet in a post minutes earlier you revert > to the 0.59uS/PPM based on silver nitrate in solution. > > A lot of us rely on your technical expertise, and those not following all > your posts will get off to different "correct" values! I realize you consider > TDS to be particle size dependent but what would help is your opinion > on the conversion for "typical" Cs. It is nice being an agreeable chap, > but now we can't argue "But Ivan said...." > > Thanks, [email protected] > > Ivan said: K. Watson, > > I should think that if you have a heavy Tyndal effect then that could > be the case. Otherwise the concentration could be as high as 10ppm. > If you have a consistent generating regime then perhaps having one or > two samples professionally tested would give you a good benchmark. > > Ivan. > > ----- Original Message ----- > From: "James K. Watson" <[email protected]> > To: <[email protected]> > Sent: Friday, 14 April 2000 11:55 > Subject: Re: CS>Hanna meter > > > > Ivan, > > I have the Hanna PWT. If I have a reading of 10.0 on the meter this > means > > the solution is about 5.5 PPM. Is this correct ? > > K. Watson -- 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] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
