Analysis of steel by x-ray fluorescence with chemical technique

Determination of several elements in steel by X-ray fluorescence method with chemical analysis technique was studied. Techniques used were (A) chemical separation-glass bead method, (B) precipitation separation-direct method, and (C) gasification separation-direct method. The method of item (A) was applied to the determination of niobium and tantalum, and of zirconium and hafnium. The method of (B) was applied to the determination of race amount of tungsten and (C) was applied to arsenic determination. The method of (A) enables to determine with ease the elements, which are difficult to separate each other by conventional chemical analysis method, such as niobium and tantalum, or zirconium and hafnium. The method of (B) and (C) are suitable to trace analysis. These methods have several merits: (1) procedures are simple and rapid analysis is available, (2) obtained values agreed accurately with the certified values by chemical analysis method, (3) proper separation method is applicable, (4) it is possible to standardize with standard reagent. Coefficient of variation (CV) were 6%, 4%, 2% and 7% for the niobium and the tantalum of 0.04% content, the zirconium and the hafnium of 0.02% content, the arsenic of (0.001 - 0.005)% content, and the tungsten of 0.005% content, respectively. (author)