Ivan Anderson wrote: > PPM reading was supplied by a silver Ion Selective Electrode. > Water was Purified Water BP and read 1uS before electrolysis.
Prior to purchasing our spectrophotometer and silver kit, I check into using a silver ion selective electrode for measuring ppm. I was told that it measures the number of ions (amount of charge) assuming the normal mobility of silver ions, and that silver colloid would not produce a correct measurement due to there typically being less charge on each particle than the number of atoms in the particle, and due to the mobility being different than for one ion. To use it properly one has to digest the silver so that you have silver nitrate first, then use the probe on the residual silver nitrate. This is exactly the same process I have to go through with the spectrophotometer for ppm measurements. I was wanting to verify that you were indeed digesting the colloidal silver before using the probe. If so this is a very interesting set of curves. Thanks, 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]>
