Hi Ivan and All; I think it is finally time to answer a few questions. In a previous post I alluded to making CS at 24 ppm in 4 1/2 hours. Ivan countered by saying that his 9 vdc to 27 vdc constant current gen would make 20 ppm in 2 1/2 hours. I don't think that he stated the brewing parameters.
So I finally got out an HP Precision Constant Current Source model #6181C, and set the voltage limit to 27 volts and the current limit to 1.0 ma. Using my best DW with 1.8 microSeimens, and the following cell conditions; 16 0z Dw, #14 gauge round electrodes, spaced 1" with 3 12/" in the DW, and running for 2 1/2 hours. It took 45 minutes for the current to come up to 1 ma. and remained constant for the rest of the time. The cell voltage dropped to 11.1 volts at the end of the run. The Rb0 (bulk resistance) of the CS t the end of the run was 58 kohms, and the ppm was 6.5. There was heavy treeing and sludge on the cell bottom.. The T.E. was heavy with sparkles. When compared to the EZCS gen product, the 24 to 27 ppm Cs has a much narrower T.E. and no sparklies. During brewing there is no treeing, sludge, and no electrode wiping. So I made another run using DW with 6.6 microSeimens and the cell current hit one ma. in about 3 seconds. The final voltage was 6.7 volts. The Rb0 for this batch was 33 kohms, and the ppm was 11.0. It is interesting that there was no treeing and almost no sludge. Also this batch had a narrower T.E. beam with less sparklies than the so called better water. Since the ISE probe and the spectrophotometer measure silver ions, the question was raised by Ivan as to how much of my CS is ionic and how much is metal? He didn't say his ratio or how he measured it. For me it would require a rather hazardous nitric acid digestion, which I don't think anyone except Marshal Dudley uses. Next week I should have the TEM results for my 10 ppm and 35 ppm made with out stirring. I have observed that stirring makes a CS with a narrow T.E. beam and almost no sparklies. So off goes another sample made by stirring along with the requisite $100.00 just to get an answer. Ian has extolled the virtues of his machine and no price. I have mentioned that the basic EZCS is $60.00 plus shipping. When stirring is added there will another $20.00 for all of the machine required. The reason that I have not pushed sales or advertised is that I an retired and don't need the hassle. However one of my customers wants to have his son make them, and I will supply all of the drawing and data for no charge, as I will anyone else that has the machine tools to build it. Ian, if you want me to rerun this with different cell parameters, I will. Either I am doing something different or the measuring techniques are wacky. "Ole Bob" -- 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]>
