A Simplified Determination of Microquantity of Carbon in Iron, Steel and Ferro-Alloy

In order to determine rapidly and accurately microquantity (below 0.1 per cent) of carbon in iron, steel and ferro-alloys, 0.5～1g of the sample was taken, carbon dioxide gas generated by its combustion was solidified by passing through a trap chilled in liquid air, and the solid carbon dioxide was vaporized and allowed to permeate a definite vacuum, the volume being read on the manometer. The analytical results by this method agreed well with those by gravimetric method within a mean standard deviation of 0.0005 per cent in low-carbon steel, and well agreeing results were also obtained with chromium metal and manganese metal. The time required for the analysis by this method was 24～26 minutes.