Determination of trace elements in acidic solution of iron and steels by graphite furnace atomic absorption spectrometry

摘要

Graphite furnace atomic absorption spectrometry (GF-AAS) has been applied to the determination of trace amounts of arsenic, bismuth, cadmium, lead, thallium and zinc in the acidic solutions of iron and steels. The iron and steels were dissolved in nitric acid. After the solution (20μl) was pipette into a L'vov platform furnace, it was ashed (600℃~30 s, hydrogen 5 ml/s) and then atomized by using argon as a purge gas and atomic absorption of each analyte was measured. The effect of ironconcentration was suppressed by the use of peak area measurement. Synthetic calibration solutions were prepared by addition of standard solution of each analyte to iron or nickel matrix solution. For arsenic, bismuth, cadmium, lead，thallium and zinc, the limits of detection (3σof blank values) were 0.05,0.025, 0.002,0.017,0.025 and 0.003 ppm, respectively, when one gram of the specimen was used. The proposed method is able to be applied to other analyte in iron and steels.