James wrote:

> What you are describing is the way it is done.  You react the silver
>  with reagents which produce a color whose intensity varies with the
> concentration available silver. 
...
> All it would take is a high-accuracy  set of printed color patches 
> to get you in the ballpark with the Hach reagents.  I think you
> could judge it certainly to within 2 PPM and possibly within 1 PPM.

Well, I guess I shoulda asked this question more often. You guys have 
been around for months now and I didn't know you knew! <grin>

Do you have any contact info for Hach? I should investigate.

Be well,

Mike D.

[Mike Devour, Citizen, Patriot, Libertarian]
[[email protected]                       ]
[Speaking only for myself...              ]


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