Abstract
A polarographic method has been studied as a way to determine 0.05 to 4% aluminum contained in ferrovanadium, ferrozirconium and ferrotitanium. According to this method, such elements as iron, titanium, zirconium, vanadium are extracted wholly in the form of cupferrate using benzene-ether mixture solution. The organic substances in the aqueous layer are decomposed with nitric and perchloric acids. Afterwards, aluminum is determined by the polarographic method in accordance with the measurement of the cathodic current of the pontachrome violet-aluminum complex compound as reported by Willard and Dean. It is to be noted that, in the case of a sample like B.S.S. No. 61 ferrovanadium, however, we have to eliminate nickel and chromium previously by means of mercury cathode electrolysis, as the sample contains a large amount of these elements. Aluminum contained in Fe-V, Fe-Zr-Si and Fe-Ti were determined by this method. Aluminum was determined by dividing into two types, i.e., acid soluble form and acid insoluble form, for the purpose of metallurgical investigation of aluminum in ferroalloys.
