Determination method of nitrogen in coal and coke.

概要

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Semi-micro gasification method was developed for the determination of nitrogen in coal and coke. The recommended procedure is as follows. The mixture of sample and soda lime in porcelain boat is covered with aluminium oxide and silica wool. Then, the boat is inserted to preheat-zone of silica tube and the sample is pyrolized by flash heating from 200 to 800°C under stream of steam and helium gas, and then the boat is inserted to heated zone of 1000°C for completion of pyrolysis. The gas generated is introduced to steam distillation flask containing the caustic soda solution and the steam-distilled ammonia is recovered by boric solution. Finally, the ammonia in the distillate is titrated with 0.01 N sulufuric acid solution. By the above two stage heating system, the volatile matter could be decomposed completely and the scattering of alkali, which causes a rapid breakage of silica tube, could be prevented. The precision of analytical value was good and the coefficient of variation was 2%. The time required for each analysis by this dual heating system is 15 minutes
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