HI w8, The Hach chemicals are set up for light of 560 nm. The Hanna uses an LED at 550. It is a dedicated single test colorimeter or spectrophotometer.
The Hanna chemicals do not work for CS, or have not been reported to do so. With the color being the same, that makes me suspect that the color generated by the reagents is probably the same and therefore, the chemistry is the same. Does anyone have some of the Hanna reagents who will report their composition and the times for each step? The Hach chemicals do work for CS. I have proposed that the Hach reagent set may work with the Hanna instrument. To find out if this is true, It will cost someone with the Hanna instrument about 60 FRNs for the Hach reagent set; some time obtaining the Hach lab handbook and some more time adapting the Hach procedure to the Hanna instrument. Most of the time will be spent generating a graph plotting known concentrations of silver---I use precision dilutions of ASC grade silver nitrate---against the amount of light absorbed by the sample. If someone will send me a meter for the trial, I will do it, and return the meter. Alternatively, I will sell at cost + shipping enough Hach sets to anyone who will do the basic setup. The tests cost about 0.60 FRNs each, and I suspect it will take about 10 or 15 of them to make the tests. The main advantage I see for the Hach instrument is that it is probably impossible to get out of calibration. A standard spec. has delicate optical and mechanical components which are easily bumped out of alignment. The overall cost to set up an Ag lab will only be 250 less than buying a used spec. with the needed specifications because of the cost of the precision glassware required for the procedure. There are several other methods of measuring Ag concentration; AA specs and visible light specs are just the most convenient, practical and low-cost ways to do it. James Osbourne Holmes [email protected] FTNWO -----Original Message----- From: w8w8 [SMTP:[email protected]] Sent: Saturday, June 24, 2000 12:19 PM To: [email protected] Subject: Re: CS>HI 93737 Silver Meter Seems like there are spectrophotometer that use reagents that work and there are spectrophotometer that use reagents that did not work. It has been said that James Holmes and Robert L. Berger each have spectrophotometers, and that is one of only two methods of correctly measuring ppm (ug/ml). (The other is with an I.S.E.(ion specific electrode) which Ivan has). Why would James and Roberts spectrophotometers, work and the Hanna HI 93737 Silver Meter not work? Erwin (In quest of a meter to measaure my silver) Trem wrote: > Hi, > Trem wrote: > Hi, > > We tried one and it did not work with colloidal silver. Was told it > was for use with dissolved silver such as in waste treatment plants > etc. The sample measured the same as the blank or as much as 25% of > the readings done on our CS by Kimball Labs as I recall. Would have > been a good way to test if it had worked. All readings were not > repeatable and were way off the mark. > > We even tried digesting the silver in nitric acid to see if that would > help. It didn't. -- 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] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
