Well, how kind! But much as I would love to have managed to create such a useful program, alas I did not. Credit must go to our new friend 'herx', who has done a marvellous job in its creation and presentation.
(Yes, we will see how accurate it is shortly, some adjustment will need to be made for the silver which plates out on the cathode.) To the conductivity measurement vs actual ppm... theory would have the ppm (as ions) multiplied by 0.74 (or thereabouts) to give corresponding conductivity in uS. In other words conductivity times 1.35 should give ppm (as ions). In reality the a factor of 1.0 works in my case, and others report a factor of 0.85 - 1.05 times conductivity to be a true representation of ionic concentration. There has been to date, no satisfactory explanation as to why the theory does not fit the facts, other than my own tentative idea that the ions form aggregations of some number, that is multi-ion particles, at particular concentrations. There is some support for this in the literature, but it is all a bit academic, and sure to rouse the Philistines among us to ban the messages that contain such technical drivel ;-) <this could be considered humour given enough leeway> Yours (tongue in cheek etc.) Ivan. > -----Original Message----- > From: S & J Young [mailto:[email protected]] > Sent: Saturday, 10 November 2001 5:42 p.m. > To: [email protected] > Subject: CS>Ivan's CS calculator > > > Ivan, > > Thanks for the equation & spread sheet. Now for the > practicalities: It is > obvious by the crud that forms on the electrodes and falls to > the bottom > that not all the silver being electrolytically removed from > the electrode > ends up as colloids. And some of the silver ends up as ions. > So what is a > practical factor to apply to the result of your PPM calculation? I am > guessing one would multiply the result of the Faraday > equation by a third to > a half. > > By the way, do you still believe the Hanna PWT readings > should be multiplied > by 0.59 (going by memory here) that you stated in this forum > two years or so > ago? > > --Steve > > ----- Original Message ----- > From: "herx" <[email protected]> > To: <[email protected]> > Sent: Friday, November 09, 2001 10:53 AM > Subject: CS>Answer how to calculate ppm of CS at home > > > Hello list, long time listener, first time caller. > > I've read many posts here regarding calculating ppm of CS. I can help > you figure out the ppm of the CS you're brewing at home, or help you > determine how long you need to brew in order to get any desired ppm. > > There are several ways of knowing the PPM of your homemade > CS. One way > that doesn't require an expensive PWT meter is to use > Faraday's equation > for electrolytic deposition. If you know how much current is flowing > through your electrodes, you can calculate the PPM being produced. If > you're not up on electrochemistry, I've written a spreadsheet > that will > calculate it for you. > > <snip> > > > > -- > 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]>
