Synopsis: We have studied the method for determination of SiO2, TiO2, Al2O3, Fe, Mn, CaO, MgO, Na2O, and K2O in coating of mild steel arc welding electrodes by atomic absorption spectrophotometry. In this study the working conditions for the determination of these components, the influences of reagents for fusion, acids, and diverse coexisting components, and the suppression of the interferences were examined systematically. A new method using a polyethylene plate mask to decrease absorbance of

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... the element that has a high sensitivity for measurement and a high content in the sample was also examined, and it was applied to the determination of Mg. The methods were actually applied for the routine analysis of coating of the electrodes. Satisfactory results were obtained; the methods were simple, rapid, reproducible, and accurate enough to be employed to analyses of various components in silicates, TiO2 in ilmenite and iron sand, and Mg in dolomite, which were used as raw materials of the coating. (Received Mar. 2, 1972) the burner tube.