Abstract
An analytical method has been established for the direct determination of trace amounts of each analyte in iron and steels solution by graphite furnace atomic absorption spectrometry (GF-AAS). The iron and steel were dissolved in nitric acid. After the solution (20 mm3) was pipetted into a L’vov platform or pyrolytically coated graphite tube furnace, it was ashed (773 K-60 s, hydrogen 5 cm3/s) and then atomized by using argon as a purge gas, and atomic absorption of each analyte was measured. The effect of diverse elements was suppressed by the use of peak area measurement. Synthetic calibration solutions were prepared by addtion of standard solution of each analyte to iron matrix solution (2 kg/m3). For cadmium, zinc, magnesium, thallium, bismuth, lead, manganese, copper, nickel, vanadium, cobalt, palladium and molybdenum, the limits of detection (3σ of blank values) were 0.003, 0.002, 0.004, 0.030, 0.042, 0.035, 0.021, 0.038, 0.045, 0.21, 0.040, 0.044 and 0.12 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.
