Some of these municipal health and safety inspectors are out of their
depth. A friend of mine grows high quality wine grapes here in
Australia (the OP is in Oz too, I think). The inspector was at pains to
insist that after hand picking, during the couple of minutes when the
bunches of grapes were carried by hand to the winery 100m from the
vines that the bunches of grapes had to be carefully protected from
atmospheric bacteria. My friend pointed out that they had been in the
open air for six months but that fact seemed irrelevant to the
inspector. A solemn promise was made, the inspector ticked the
appropriate box, and all were content.
John
======================
Ralph W. Lambrecht wrote:
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...
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
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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
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