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Determination of Bismuth in Nickel-Base Superalloys by Atomic Absorption Spectrophotometry

Volume 28, Number 2 (April 1974) Page 192-193

White, Jaxon A.; Harper, William L.; Friedman, A. Paul; Banas, Victor E.

It has been known that certain trace elements have a deleterious effect on the physical properties of nickel- and cobalt-based superalloys at elevated temperatures. One of these elements, bismuth, has been known to cause this phenomenon at a level above 1 μg/g. As a result, this laboratory has had to develop a method to analyze accurately for this metal at a level of from 0.1 to 1 μg/g to insure control below 0.5 μg/g. The technique arrived at utilizes a cathodic electrodeposition to preconcentrate the bismuth prior to analysis by atomic absorption spectrophotometry. The electrodeposition process involves preplating a platinum cathode with copper and then coplating the bismuth with additional amounts of copper. The sample resulting from this process is compared to a series of standards containing equal amounts of copper and HNO3 to eliminate any interferences.