[Determination of trace bismuth in iron, steel and alloy by hydride generation-atomic fluorimetry]

With the aid of hydride generation-atomic fluorimetry, an analysis method by adding thiosemicarbazide-ascorbic acid and phosphoric acid to eliminate the interference of matrix has been developed for the determination of trace bismuth in iron, steel and alloy. The detection limit is Bi = 0.02 microgram.g-1 (3 sigma, n = 11, sample amount 0.2000 g). The method has been applied to determine trace arsenic in middle and low alloy steel, ferro and nickel-based superalloy, nickel-based superalloy, cobalt-based superalloy, copper alloy with satisfactory results.