I discard fixer when it has 1g/liter, which is 1 ppk and my Tetenal test strip is sufficiently sensitive to read that. This needs to be diluted with 20 liters of water first to get the silver concentration down to 50 ppm. That's too easy. There must be a quantity limit, or maybe they're trying to tell you something...
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P don't print this e-mail unless you really have to On Jan 31, 2010, at 08:35, Peter Badcock wrote:
Sorry for the cross post if any of you also read APUG, but I'll post conclusions to both lists.So I've searched APUG, pure_silver and the 'net but to little avail. 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 ? Then my local government authority will permit it to be discarded down the drain.Some ideas include measuring the conductivity of the sol'n (assuming I am testing for dissolved silver). Also perhaps Colorimetry. No test strips will test such low levels of silver.rgds Peter
