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 44076
Neutralize silver coated item taken out
from cyanide solution [India]
February 20, 2007
Hello,
Can we dip silver plated item in calcium hypochlorite or sodium
hypochlorite, in order to neutralize them
I will be using KAg(CN)2 solution for plating.
rhank you
Vikrant A. Chaudhari
student - Mumbai, India
February 20, 2007
No! You must carefully rinse the parts in water until there is no
sign of cyanide. Then, when you absolutely are sure there is no
entrapped cyanide, you can dip the part into a very dilute (maybe 1
percent) sulphric acid under good ventilation.
The rinsewater can be treated with sodium hypochlorite to destroy
the cyanide, again with good ventilation. However, cyanide is a
terribly dangerous solution for a student to be using and the fact is
you should not be asking these questions because you should not be
attempting these procedures until you have received hands-on training
from an experienced party. The cyanide solution is poisonous of
itself, but it will also release deadly poisonos hydrogen cyanide gas
if acidified.
 
Ted Mooney, P.E.
finishing.com Inc. - Brick,
NJ
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