Standard Su(phuric Acid.-A decinormal solution is used. Of this one cc. = 0.0006 gram carbon. This method is best adapted for low carbon steels, because only small quantities of bariuin carbonate have to be filtered and washed. When analyzing high carboii steels I have used sriialler weights of steel (one or two grams) and have rinsed the barium carbonate and excess of barium hydroxide solution into a liter flask ; after making up to one liter with pure water, I filter off 2 0 0 cc. and titrate

more »

... by standard sulphuric acid. Steel 11920 gave 1-35 per cent. and 1.35. per cent. carbon by this method. T h e work which I have been able to do seeins to me to suffice to call attention to the meritsof the barium hydroxide methods.