thanks much Marshall --- On Wed, 9/8/10, Marshall Dudley <mdud...@king-cart.com> wrote:
From: Marshall Dudley <mdud...@king-cart.com> Subject: Re: CS>U/S to Silver Strength Reading To: silver-list@eskimo.com Date: Wednesday, September 8, 2010, 2:27 PM http://www.bghydro.com/mmbgh/Others/How%20do%20I%20calibrate%20my%20TDS%20meter.pdf shows that the Hanna TDS meter is calibrated 2:1 between uS and TDS. This is my understanding of the physics and why you have to double the reading for ppm of ionic silver solution:. 1. TDS meters are set for sodium chloride. Sodium has an atomic weight of 23 and chlorine has an atomic weight of 35.5. They both contribute to the conductivity. Now ionic silver is Ag2O with an ion weight of 215 and 16. The silver thus has a mobility that is 23/215 or about 1/10 of that of sodium, and the oxygen has a mobility that is about 2.2 times that of the Chlorine. If you compute the total mobilities of the two you would get 1/23 + 1/35.5 = 0.07 and 1/215 + 1/16 = 0.067. So at first look it would appear that the calibrations are almost identical, but you will note that the Silver ion carries a charge of 2, but the Sodium only a charge of one. Thus the silver will have a mobility of the electrons of twice that of the ions, and thus must be multiplied by 2 which give .134. When that is ratioed with the mobility of sodium chloride you get a ratio of 1.91. If you add 5% colloidal component you get 2.01 to one, which is very close to the 2:1 ratio given. If my analysis is correct, then EIS with a colloidal component more than 5% will actually be slightly higher ppm than using a TDS meter and multiply by two or using the result of the conductivity meter. This is easily seen by the drop off of the conductivity as the solution ages and some of the ionic converts to colloid. Marshall j petras wrote: > Trem: > > So you're differentiating the microsiemen meter (1:1) from the TDS meter, > which you say should be converted at half the value...do I understand that > correctly? They are functionally different? > The distinction in meters, if I am correct, is that the microsiemen meter > reads solution conductivity; and the tds reads just that - dissolved solids. > > Can you (or someone else) please send a link for reference, because in my > cursory research thus far, I have heard different things - thanks. > John > > > --- On *Wed, 9/8/10, Trem /<t...@silvergen.com>/* wrote: > > > From: Trem <t...@silvergen.com> > Subject: Re: CS>U/S to Silver Strength Reading > To: silver-list@eskimo.com > Date: Wednesday, September 8, 2010, 12:56 PM > > It's 1 to 1 TDS readings are 1/2 the PPM > > Trem > > > ----- Original Message ----- > From: "nessie" <nes...@shaw.ca </mc/compose?to=nes...@shaw.ca>> > To: <silver-list@eskimo.com </mc/compose?to=silver-l...@eskimo.com>> > Sent: Wednesday, September 08, 2010 9:33 AM > Subject: CS>U/S to Silver Strength Reading > > > > Hi Group: > > I think this has been discussed before. But I forget the > > outcome. > > Basically, what is the mathematical adjustment when going > > from U/S (Microsemens) measurement > > to PPM for measuring silver strength/concentration . > Seems > > to me the silver strength/concentration in PPm was half of the > > microsemens reading? > > Is that correct or was it 2/3 the microsemen reading? > > >thanks...nessie > > > > > > -- > > The Silver List is a moderated forum for discussing Colloidal > Silver. > > Rules and Instructions: http://www.silverlist.org > > > > Unsubscribe: > > <mailto:silver-list-requ...@eskimo.com > </mc/compose?to=silver-list-requ...@eskimo.com>?subject=unsubscribe> > > Archives: > > http://www.mail-archive.com/silver-list@eskimo.com/maillist.html > > > > Off-Topic discussions: <mailto:silver-off-topic-l...@eskimo.com > </mc/compose?to=silver-off-topic-l...@eskimo.com>> > > List Owner: Mike Devour <mailto:mdev...@eskimo.com > </mc/compose?to=mdev...@eskimo.com>> > > > > > >-------------------------------------------------------------------------------- > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.851 / Virus Database: 271.1.1/3121 - Release Date: > 09/07/10 > 23:07:00 > >
