Hello Marshall, In theory you are correct. IF all of the silver oxide has been converted to silver metal, the ORP should read 0.
However, I have found that ORP measurement can be less than exact under certain conditions. I use it as a general indicator and to monitor change. For example, if you have a pond with some fish in it and the ORP of the pond water drops below around 250 algae will begin to form. However, if you raise the ORP of the water to above around 550, you will kill the fish. You can use the same numbers for the water for cut flowers or for a cut Christmas tree. When the ORP of the water drops below 250, stemic rot will form and a biofilm will form in the container. This will block the plants ability to absorb water and the flower or tree will quickly dry out. If you use water that has an ORP much above 550, you will poison the flowers or tree, and they will quickly dry out. If you use water in the "sweet" range, you will double the life of the flowers or tree. H2O2 starts out with an ORP of around 450. This level drops as the H2O2 ages. When purifying water with chlorine or chlorine dioxide you want the ORP to be above 650. I seem to remember that there may be a loose relationship between ORP and PH. I may be above 0 because the PH of the solution is below neutral. I'll add some baking soda to the solution to bring the PH to 7 and measure the ORP again. Tom ----- Original Message ----- From: "Marshall Dudley" <mdud...@king-cart.com> To: <silver-list@eskimo.com> Sent: Thursday, March 18, 2010 6:19 AM Subject: Re: CS>Making 100% colloidal EIS > So, if I am understanding this correctly, the more positive the ORP is, > the more oxidative it is. Thus the drop in the ORP would indicate that > something that was oxidative (silver oxide) has been reduced (now silver > metal). Unless I am misinterpreting, that is what I would expect. > However if all the silver was reduced though, the question for me is, > what is still there that is oxidizing, that is why is the ORP not 0? > > Marshall > > poast wrote: > > Hello Marshall, > > > > Oxygen reduction potential (ORP) is measured using equipment similar to that > > used to measure PH. The probe is constructed differently from the PH probe, > > but the measurement process is similar. > > > > Here is an introductory article on ORP. > > > > http://www.rhtubs.com/ORP.htm > > > > My interest in ORP comes from exploring the concept of using EIS to > > disinfect raw water for drinking, and to explore its use to disinfect waste > > water for emergency sanitation in the event of a natural (or unnatural) > > disaster. > > > > Tom -- 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?subject=unsubscribe> Archives: http://www.mail-archive.com/silver-list@eskimo.com/maillist.html Off-Topic discussions: <mailto:silver-off-topic-l...@eskimo.com> List Owner: Mike Devour <mailto:mdev...@eskimo.com>
