The atomization processes of calcium, aluminum and manganese oxides on a molybdenum filament

• Published in: Analytica chimica acta 1977-03, Vol.89 (1), p.217-219
• Main Authors: Hasegawa, Tsuneo, Yanagisawa, Masaaki, Takeuchi, Tsugio
• Format: Article
• Language: English
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/S0003-2670(01)83089-0

The graphite furnace atomizer is widely used in nonflame atomic absorption spectrometry; also, the reductive ability of C is known to be important in atom formation processes. An atomization device described has a Mo filament 50 mm long, 2 mm wide, 0.05 mm thick; the light beam is 1 mm diam. The form of the filament is important (a diagram is given). An Al(NO3)3 standard solution was used. Peaks in atomization curves shown correspond to the metal oxides. The probable reaction is: MmO2n + kMo mM + MokO2n, with atomization peaks controlled by the contact area between oxide and filment. The crystal form, which depends on the temperature used to eliminate the solvent (water), and the amount of sample, contribute. The Al2O3 peaks shown are for 7 mm above the filament at 1840 C in H and 1 mm above at 1870 C in Ar. The model described applies.--EPAA/AF.