2003 Volume 89 Issue 9 Pages 953-957
Trace amount of bismuth was determined by an annular-shaped high power (1.0 kW) nitrogen microwave induced plasma (N2-MIP) atomic emission spectrometry (AES) with hydride generation technique. Under the optimized experimental conditions, bismuth was determined at Bi I 223.061 nm line by use of N2-MIP-AES coupled with hydride generation, and the best attainable detection limit was 102ng/ml with a linear dynamic range of 30 to 30, 000ng/ml. The presence of several diverse elements and ions was found to cause more or less depressing interferences with the proposed technique. This method was applied to the determination of trace amounts of bismuth in steels. When bismuth in steels was determined, a large amount of Fe(III) in the solution caused a severe depressing interference, while the presence of Fe(II) showed little or no significant interference. Of the several interference-releasing agents examined, thiourea was found to be the most preferable to reduce Fe(III) to Fe(II). The present method has been applied to the determination of bismuth in steels. The results obtained by the proposed method agreed satisfactorily with the certified values.