Mike Monett wrote: > url: http://escribe.com/health/thesilverlist/m60056.html > Re: CS>Re: $$$ perpectives > > Hi Bob, > > I found the Hach web site and looked at their current > spectrophotometers: > > http://www.hach.com/Spec/S4000tbl.htm > > I have some questions. > > A. The procedure for silver is shown in > > > http://ecommerce.hach.com/stores/hach/pdfs/dr4000cd/eng_pdf/Silver_PP_Other_CLR_Eng_4000.pdf > > They make no distinction between silver atoms and silver particles. > > How does the calibration change as the silver content changes from > individual atoms to particles?
ions or atoms are 100% and particles are 0%. To test for particles requires digestion, which Hach send me a procedure for some years ago. Basically you mix the CS with nitric acid and boil dry under a fume hood. Then you add nitric acid again and heat and reflux the sides. Then you neutralize with sodium hydroxide. > > > B. The procedure is calibrated for neutral silver. > > What happens when the silver is ionized, as in colloidal silver? How > do you get a calibration for colloidal silver? > > C. The procedures seem fairly complicated, with plenty of room for > error. Do you have a standard solution you use for verification? > > D. The range for silver on both models is 0 to 0.700 mg/L > > http://www.hach.com/Spec/S4000tbl.htm > > Does this mean it can measure from 0 to 0.7 ppm? If so, then 12 ppm > or more is outside the range. > You have to dilute the sample to put it within the range. > > How do you know the readings are reliable at these concentrations? Those are the specifications. Marshall > > > Best Regards, > > Mike Monett > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > Instructions for unsubscribing may be found at: http://silverlist.org > > To post, address your message to: [email protected] > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > List maintainer: Mike Devour <[email protected]>
