Atomic-absorption determination of bismuth in complex nickel-base alloys by generation of its covalent hydride

Abstract

A requirement has arisen in the aero-engine industry for a method that is capable of determining trace amounts of bismuth in complex nickel-base alloys. This paper deals with the determination of bismuth at the 0–1 p.p.m. level in nickel-base alloys after dissolution of the alloy followed by generation of bismuth hydride and its subsequent measurement by atomic-absorption spectrophotometry. Interference effects, due to the complex matrix, have been overcome and a procedure has been developed that is rapid and sensitive at these very low levels. The method is applicable to a wide range of nickel-base alloys commonly used in the aero-engine industry.