-----Original Message----- From: Tai-Pan <[email protected]> To: M. G. Devour <[email protected]> Cc: [email protected] <[email protected]> Date: Tuesday, 25 May 1999 16:26 Subject: CS>TDS-1 Tester is great, How it works
Interesting discussion chaps, I can't see why a TDS meter would not be very accurate in measuring ionic silver colloid, if properly calibrated. If the meter (TDS) reports concentration as PPM (CaCO3), then the reading would be, in CS: Molecular weight of CaCO3 = 100, Equivalent weight = 50 Molecular weight of Ag = 100, Equivalent weight = 100 PPM of Ag is therefore 50/100 = 0.5 times meter reading.( I think?) To calibrate, one would find the equivalent weight of salt NaCl and divide that into the equivalent weight of CaCO3 to find the factor, to multiply the PPM readings by. Then make a standard test solution by adding, say 10mg of salt to 1L of water for a 10 PPM solution and calibrate rading to that. Anyway here are a few links to increase the understanding of those who need it, and to refresh the minds of those who don't :-) ps. Those with conductivity meters should appreciate the graph referred to below. (hello Mike) http://www.humboldt.edu/~ced2/cond/cond.html Introduction to conductivity measurement, using Calculator Based Lab. http://www.goodwaterco.com/tds.htm Good info on Conductivity, TDS and a PPM(as CaCO3) vs Conductivity and Resistivity Graph. http://www.coleparmer.com/Techinfo/Techstuf/condtec.htm Conductivity definitions and Tips. http://www.culligan.ca/tds.html A definition of the Calcium Carbonate equivalent weight as used in TDS measurement. Regards - Ivan. -- 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]>
