光電光度計による鉄鋼の迅速分析法（第2報）珪素，窒素，ニッケル，燐及びモリブデンの定量

Abstract

Silicon, Nitrogen, Niekel, Phosphorus and Molybdenum in Iron and Steel were determined rapidly by the use of photo-electric photometer.\ oindent(1) Silicon: In the weak acid solution, silicon was colorized as “Molybdenum blue” by reducing silico-molybdate with ferrous salts and oxalic acid, and 0.04∼0.21% of silicon in steel was determined in about 10 minutes, by refering to the calibration curve prepared with known amounts of silicon.\ oindent(2) Nitrogen: Sample was dissolved in an acid and nitrogen was converted to ammonium salts. After the separation of iron, it was colorizid with phenol and chloramin and 0.0094∼0.0594% of nitrogen in iron was determined.\ oindent(3) Nickel: In the alkaline solution, nickel gives very intensive red coloured complex salts with dimethylglyoxime in the presence of oxydizing reagent. Applying this reaction, after the removal of iron, about 0.008∼0.06% of nickel in iron was determined in about 10 minutes.\ oindent(4) Phosphorus: Applying the “Molybdenum blue” reaction with hydrazine, 0.022∼0.079% of phosphorus in iron was determined after the reduction of iron with sodiumsulfite.\ oindent(5) Molybdenum: 0.20∼1.15% of molybdenum in iron and steel was determined without separation of iron by the use of the reaction in which molybdenum forms the coloured complex salt with stanous chlorid and potassium thiocyanate.