[pure-silver] Re: Measuring low levels of silver in fixer
- From: Peter Badcock <peter.badcock@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 1 Feb 2010 15:53:17 +1100
Thanks Howard,
This link <http://en.wikipedia.org/wiki/Argentometry> mentions the Volhard
method of Argentometry.
And Ralph, I've emailed the maintainers of Australia's PURE
code<http://www.photoimaging.com.au/PURE2003>(PURE=Photographic
Uniform Regulations for the Environment) to seek
clarification of their limit. Specifically what mass of silver per time is
permitted to be discharged (I'll be way under that anyway).
rgds
Peter
On 1 February 2010 03:00, Howard Efner <hfefner@xxxxxxxxxxxxx> wrote:
>
> 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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