Hello there Youngsters, Since "the Blue Lady" isn't around to stir up some excitement I felt the need.
Since I am retired and not doing a lot of consulting I have taken up the cudgel for CS. I have just acquired a spectrophotometer $225.00 new army surplus and a Leeds Northrop conductivity cell. I have several dozen samples in 16 oz clear "SOLO" plastic drinking cups "aging" in my basement work shop. They have been made with all combinations of 36, 145,180,280 Vdc. with spacings of .8", 1", and 2". There is a magnificent color display from clear to "Coor's beer" yellow. Some would turn slightly yellow after shutdown of the cell or over night some remained clear, and some turned yellow during the process. I am just starting to sort this all out. I wouldn't work at 10Kv because of the inordinate amount of time (4hrs) while with 280 V it's done in 7 minutes. By the way if you are going to use 280 Vdc at .8" or 1" spacing then you need my simple mechanical agitator. It is a $0.99 electric motor from Radio Shack with about a 2" length of insulation from a #14 solid copper wire. It will stir my 7 pint tank which is 4 1/2" dia by 11" tall. Works like gangbusters. If you are going to experiment then I would suggest a digital meter in the negative line to record the ma. with time at a given voltage. Then plot the data note Tyndale and color. By the way after one or two 14 oz runs cut the time by about 25% stop the process look at the Tyndale. Restart the process and run about another 10% of time. Repeat this until you get yellow in the cell Then you will have a good idea of timing for the color you want. I have s.e.m. samples at two universities and three ppm samples with CS Pro. I am trying to learn to use the spectrophotometer, but have not yet received my standards. As was pointed out your meters for ppm are useless until you convert the metallic silver into an ionized solution. As for my "L&N" ( you can't find a better one) conductivity cell both distilled and deionized-demineralized water check better that .5 micro seimens. (I don't believe it) but when I place the cell into the "beer" colored sample the conductivity was 988,000 ohms or 1.01 ms.The reason I am skeptical at one time I wanted to measure moisture in the ground using "Beckman blocks" (1/4" slab of plaster with copper screen on both sides encased in about 1/4" of plaster.). DC causes a space charge and the readings drift all over the place. When I ran a variable frequency ohmmeter( made it) the results stabilized about 900 hz so I used 1 khz. I must investigate this with CS. If there is an electronic "techie" out there that would like to tackle the measuring of Tyndale in the cell during formation of CS so that we can consistently hit our desired end point, talk to me of the net. I am up to my ears with what I have going now. I have more to say but not now, i.e. temperature, color, Tyndale, etc. Robert -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
