Good post Ole Bob, Would this perhaps explain the higher than expected ppm readings than what they would be according to Faraday's laws of electrolysis.
Arnold ----- Original Message ----- From: "Robert Berger" <bober...@swbell.net> To: "silver-list" <silver-list@eskimo.com> Sent: Sunday, August 03, 2003 1:07 PM Subject: CS>PWT & its Limits > Greetings EIS'ers, > > This will be classic Berger and may well be worth printing for history. > > The PWT or Pure Water Tester has probably become the most used tool by > list members to ascertain the concentration of their silver solution. > However when used by it's self it is not adequate for the task assigned. > The addition of a series digital current meter will greatly facilitate > the process, but the combination still is not adequate to complete the > task. > > The reason being for these tools inadequacy is that the DW used is not > always the same. When measuring the DW with the PWT one is measuring > the ability of the DW to carry current. One cannot buy "pure water" as > they all contain some impurities, as it was reported about a week ago, > one supplier said their DW has 0.02+ ppm of nickel and 0.3+ ppm of > copper. Also the DW will contain dissolved nitrogen gas and may well > have some CO2 gas which forms carbonic acid like soda pop. These are > process variables that we cannot control or eliminate. Water's ability > to adsorb these gases is the reason why I do not use bubble stirring as > it will affect the PWT readings. > > The most sensitive measure of the DW quality is the initial current for > your particular setup. It would be most enlightening to measure the > conductance (with the PWT) and the current at regular intervals during > the brew cycle (every 1/2 hr) and plot the data. If the two data plots > are parallel each other then the PWT reading will read the Ag+ ions by > using the appropriate "fudge factor." If they divert (separate) then all > bets are off, as the "fudge factor" will change with length of brew. > > Now for the caveat, the earlier Wal-Mart made at Hazelwood MO, had an > initial conductance of 2.0 to 2.5 uS/cm and for my setup the initial > current would be about 1 mA. (25 uA/sqin) and would rise slowly as would > the conductance curve. > > The new W-M DW from KCKS measures about 4 to 5 uS/cm with an initial > current of about 1 mA., however the current rises very fast and the > conductance curve rose even faster. So time for a given PPM has changed! > > CONCLUSION: > If you would plot the data whenever the new DW has a 10% change in > initial reading you will be able to generate a history that will allow > you to reproduce nearly the same results. > > Remember "No pain no gain" > > "Ole Bob" > > > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > Instructions for unsubscribing may be found at: http://silverlist.org > > To post, address your message to: silver-list@eskimo.com > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > List maintainer: Mike Devour <mdev...@eskimo.com>
