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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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What metal won't dissolve in aqua regia
I discovered a metallic plating on a crucible after burning its organic contents at 550 °C. After following US customs guidelines for the analysis of metal coatings, I have discovered this coating is not soluble and remains present in solution in Nitric acid, Hydrochloric acid, and aqua regia (1:3). I certainly don't believe I am testing for any noble metals. Any ideas?
Katherine Heilmangraduate student - Frederick, Maryland, USA
2006
A. To my knowledge Rhodium is the only metal that is not soluble in aqua regia.
Guillermo MarrufoMonterrey, NL, Mexico
2006
A. I found this on the table: "Iridium is not attacked by any of the acids nor by aqua regia, but is attacked by molten salts, such as NaCl and NaCN". I don't know but I was told of two more that won't have a reaction.
Chris Morlock- vernal utah usa
June 27, 2015
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