[pure-silver] Re: Measuring low levels of silver in fixer
- From: Howard Efner <hfefner@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 31 Jan 2010 09:00:24 -0700
On Jan 31, 2010, at 12:35 AM, Peter Badcock wrote:
Can folks please list me a few different inexpensive and relatively
easy methods to measure/test when the silver in my (yet to be
processed/recovered) fixing solution is below 50ppm ?
rgds
Peter
Peter, see if your library has or can get Scott's _Standard Methods
of Analysis_. It is the Bible of classical analytical techniques.
Two possibilities would be a Volhard titration ( standardized ammonium
thiocyanate and a iron indicator - silver thiocyanate precipitates
until the end point then the red iron thiocyanate complex is formed to
indicate the end point.) I do not know if it is sensitive enough for
50 ppm. Ion chromatography is a possibility but the equipment is not
cheap.
Looks like this is another application of the impossible triad:
GOOD
FAST
CHEAP
Pick any two.
Howard
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