What do you think about the guy who says he makes 40 ppm in a minute or two using a microwave oven 3600 volts?
Or something like that. If that really works, then I should be able to make pretty good EIS with the 2000v electrophoresis power supply in a very short time. Maybe I have been over-cooking the stuff trying to get higher ppm...? Dick ----- Original Message ---- From: poast <[email protected]> To: [email protected] Sent: Sat, February 20, 2010 4:17:19 PM Subject: Re: CS>Which layer of skin for silver deposit? Hello Dick, uS is micro siemens, and is a measure of the conductivity of water. Since the electrodes are spaced 1 cm apart the results come out in uS/cm. Some instruments are set up to display PPM. They do this by measuring the conductivity of a salt solution, then multiplying it by a factor number to arrive at PPM. If you are measuring the same salt concentration that the meter was set up for, you will get reasonably accurate PPM results. Unfortunately, none of the standard calibration solutions are set up for EIS. Trem (SilverGen) made several batches of EIS, tested them with a uS meter, then sent them off for laboratory analysis. He uses a Hanna PWT meter. Since EIS is mostly ionic, and since the PWT meter mostly responds to ions rather than particles, the theory is that the uS value should be close to the actual PPM of silver in the solution once correction factors are applied. The process involves measuring the water you are starting with. When your batch is finished, let it sit for a day or so, then measure it and subtract the initial reading you got for your water. This should be an indicator of the ions in the solution. When Trem got the lab sample reports, he discovered that a "typical" batch has about 85% ions and 15% particles. He suggests using a 1.2 correction factor for EIS made with his generators. While fine in theory, there is some controversy over this. Ode has also had lab samples done, and does not find the correction factor valid. On top of that, the lab people say that a conductivity measurement will only provide a "ball park" estimate of the concentration of silver in solution, and the only way to know for sure is to spend the $200/sample and have it analyzed. This is why I gave my results in uS/cm rather than PPM. The main question is to determine what ion contamination can be introduced into the solution when you heat it up. If there is no contamination being introduced, then it is reasonable to believe the concentration is being increased by removing water from it. Tom -- The Silver List is a moderated forum for discussing Colloidal Silver. Rules and Instructions: http://www.silverlist.org Unsubscribe: <mailto:[email protected]?subject=unsubscribe> Archives: http://www.mail-archive.com/[email protected]/maillist.html Off-Topic discussions: <mailto:[email protected]> List Owner: Mike Devour <mailto:[email protected]>
