Hi Marshall, Is there any chance that one batch was contaminated with soap or something like that? Tony
On 29 Dec 2005 at 19:44, Marshall Dudley wrote about : Subject : CS>EIS and H2O2 > OK, I am totally buffaloed now. I have made two 5 gallon batches and > added H2O2 to them. Everything is as close to identical between them as I > can get, but the reactions were totally different. > > Batches were produced as follows: > > Initial pH of water = 6.8 > electrode area = 48 square inches each .999 silver plates > current = 38 mA > voltage ran typically 15-16 volts during making it > continuous stirring, and polarity reversal at one minute per half cycle. > Silver content estimate from conductivity measurements 20 ppm > both were crystal clear, and measured 16.5 uS. > both batches made at about 62 degrees F. > tyndall was faint > did not measure pH before adding H2O2 > > Added .5 teaspoon H2O2 per gallon, IE 2.5 teaspoons of 3% to 5 gallons to > give 17 ppm > First batch tyndall stayed faint, maybe even became fainter - > conductivity measured 16 uS essentially unchanged > Second batch tyndall became strong, EIS has a slightly cloudy look, but > no color, conductivity 9.5 uS approximately halved. > Both batches measure a pH of about 7.6 after adding H2O2. Adding H2O2 to > distilled water gives a pH of 6.8 unchanged from plain DW. > > Taking samples of the second batch I did the following: > > Heated it, cloudiness and tyndall stayed the same, indicating that it was > no silver chloride or silver oxide precipitant since the solution limit > goes up when you heat it. > Diluted it by 50%, tyndall approximately halved, indicating once again > that the cloudiness is NOT a silver compound with limited solubility > Added another 50 or so ppm of H2O2, no change. Added 500 or more ppm of > H2O2 and it cleared up. I have no idea what that means. > Added ammonia (ammonium hydroxide), tyndall did not change, proving that > the cloudyness is from colloidal particles not from any molecular > compounds of silver precipitated. > Checked for color, none noted, meaning that the particle size is either > very small, so the absorption is in the uv range, or very big so the > absorption is in the infrared range. Strong tyndall implies large > particles though. Will let sit for 24 hours and see if anything > precipitates out, if we have large particles I expect to see it clear > upon sitting. > > I am making another batch now. Before adding the H2O2 to the entire > batch, I plan on adding it to a few ounce a drop at a time and try to > figure out some more if the 3rd batch clouds up. > > Marshall > > > > > -- > The Silver List is a moderated forum for discussing Colloidal Silver. > > Instructions for unsubscribing are posted at: http://silverlist.org > > To post, address your message to: silver-list@eskimo.com > > Address Off-Topic messages to: silver-off-topic-l...@eskimo.com > > The Silver List and Off Topic List archives are currently down... > > List maintainer: Mike Devour <mdev...@eskimo.com> >
