Direct-reading AES Determination of C, Ni, Cr, Cu, Mo in Stainless Steel (CD4MCu)

Five elements (i.e., C, Ni, Cr, Cu and Mo) in stainless steel (CD4MCu) were determined by photoelectric direct-reading atomic emission spectrometry. Accuracy and precision of the method were improved by correction of interferences of co-existing elements, increasing number of standard samples used in preparation of standard working curves for the 5 elements (13 standard samples were taken in this method), and selecting proper sites on the sample cubes for excitation. Ranges of determination (w%) for the 5 elements were as follows: carbon: 0.02%-0.35%; nickel: 3.50%-28.0%; chromium: 6.50%-32.0%; copper: 0.05%-5.0%; molybdenum: 0.05%-4.0%. Precision was tested and values of RSD′s (n=11) found were 4.8% (for C), 0.4% (for Ni, Cr and Mo) and 2.3% (for Cu). Five samples of stainless steel (CD4MCu) were analyzed by the present method, giving results in consistency with those obtained by the chemical method given in GB standards.