A Study of Atomic Absorption Spectrometry : Determination of Magnesium and Calcium in Slag and Cast Iron

概要

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Atomic absorption-spectrometric determinations of magnesium and of calcium were carried out and the method was applied to the determination of magnesium and calcium in slag and to the determination of magnesium in cast iron. The absorbance for magnesium was measured at 2852A by using 30 mA of current of hollow cathode lamp, 1.1 kg/cm^2 of air pressure and 0.48 kg/cm^2 of acetylene gas pressure. That for calcium was measured at 4227A by using 50 mA of current of hollow cathode lamp, 1.1 kg/cm^2 of air pressure and 0.5 kg/cm^2 of acetylene gas pressure. Effects of diverse ions and acid concentrations were also examined. Aluminium, silicon and several other ions interfered with the atomic absorption of magnesium and calcium in flame, but those interferences were all eliminated by 1.5 mg/ml of strontium in the sample solution. These fundamental results were applied to the determination of magnesium and calcium in slag. Magnesium in cast iron was also determined by a standard addition method without any preliminary separation. The results were very accurate and highly reproducible.
東北大学の論文