鋳銑・銑鉄中のマグネシウム比色定量

概要

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In the previous paper of this series, the writer reported on the gravimetric determination of magnesim in cast or pig iron, but this method was found to be rather tedious in field operation so that an oxine colorimetry was devised. After decomposition of the sample with an acid, potassium cyanide solution is added to remove the majority of iron as a complex salt. The remainder of iron and manganese are removed as a hydroxide (Fe) or dioxide (Mn), calcium is removed as an oxalate, and magnesium is precipitated with oxine. This precipitate is collected by filtration, dissolved in hydrochloric acid, and colorimetrically determined with the use of sulfanilic acid and sodium nitrite. This present method is simple in procedures, necessitates only a small amount of reagents as compared to the gravimetric method, and the time of analysis is shortened.
社団法人日本分析化学会の論文