> why not shop the net for a used > spectrophotometer? I have seen several which will do the trick for > about 400. You can get excellent really high-end but obsolete stuff > for a bit more.
Just curious: what kind of capability does this kind of spec have? What range of wavelengths, UV, visible? Is wavelength fixed, manually selected, scanned? Computer interface? What other parameters are important in evaluating the quality of such an instrument? Sensitivity? Resolution? If I understand correctly, you use the hach reagents to digest and mark the silver, then read the absorption on the spec. This is at a fixed set of wavelengths, one wavelength, ... or what? Essentially colorimitry? I'm looking for an overview, just so I understand how the pieces fit a little better. If an investment of a grand would give me the ability to do what I want to do, it'd be just worth thinking about. > I have just begun recording mS of my batches to plot against > analyzed mg/L, more out of curiosity than anything else. Bruce Marx > told me a couple of years ago that he had very poor correlation. Yeah, who knows with the hvac product? You could have such dependency on water quality or other seemingly minor variables that it might not work *because of the nature of the product*. But for a narrow range of process conditions, Ivan is showing us a decent correlation between ppm and conductivity in at least his lvdc process. . > And, knowing PPM, even with precision, is not very helpful in terms > of effectiveness it you don't know anything about particle size. Which is one thing Marshall, I think, told us: there is a correlation between absorption vs. wavelength vs. particle size. Which is why it would be useful to have a scanning, or scannable, spectrophotometer sensitive enough to directly detect the absoption characteristics of samples of CS. > We are also into the realm of how many Angels can dance on the head > of a pin: how many silver bits does it take to destroy [Can't kill > 'em; my microbiology text says they aren't alive] one herpes > simplex viron? Will a huge clump with a big charge do it, or is a > single atom best? Well, if we can at least know the physical characteristics of what we're making, we can then attempt to evaluate performance on the basis of effectiveness, absorption, excretion, etc. One step at a time. Be well, Mike D. [Mike Devour, Citizen, Patriot, Libertarian] [[email protected] ] [Speaking only for myself... ] -- 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]>
