Marshall; I make clear CS all the time in the range of 12 to 20 ppm and I test it with a spectrophotometer. I fact I am ordering my fourth kit from Hach for solver testinf in four months.
If you want to know how go off line and we will talk. Robert Marshall Dudley wrote: > Ivan Anderson wrote: > > > Marshall wrote: > > > > > Longer means higher ppm means bigger particles. Once you get to > > about 5 ppm we > > > find that additional ppm almost all goes into bigger particles, not > > more > > > particles. > > > > Marshall, > > you seem to deal in absolutes a bit to readilly ;-) > > > > I take that you believe that the colour of a silver colloid is a > > 'reflection' of its particle size, and that a water-clear sol > > indicates the smallest size. > > > > This is confirmed by many scientific references. Go to the library and read > the "Colloidal Chemistry" reference book, it is probably one of the easiest > to find, but I have found at least 8 references that state the same thing, > some textbooks, and others in scientific journals. > > > Then how can my small DC units produce clear CS at 20ppm and higher as > > measured by the Ion Selective Electrode method? > > Don't know. What is the Ion Selective Electrode method? Send me some of > your clear 20 ppm and I will do a ppm test on it. In no case have I ever > found it possible to exceed 5 ppm by much wihout getting some color. We use > a $5300 machine purchased specifically to test the ppm of silver, and it is > accurate to about 1 part per thousand. If you have found a way to exceed > this level and maintain small particle size I would sure like to know how > you do it. > > > C'mon mate, the fact that you can not or do not does not necessarily > > apply universally. > > > > Ivan. > > > > True. Please send me a sample. First we need to know if the ppm you are > reporting is accurate. I will also run a spectrograph on it so we know > exactly what color it is as well (even if it is uv). That will allow me to > easily see if it departs from everything we have tested before. > > Marshall. > > -- > 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]> -- 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]>
