Abstract
Study has been made on the effect of aluminium on ditermination of nitrogen in steel. The results are summarized as follows. In the case of determining nitrogen in steel containing much alminium (>0.3%Al) by applying centrifuge-separation-photmetric method without alkali distillation, lower values have always been found than that obtained by applying alkali distillation method. This is not due to the effect of aluminium ions on ammonia-nessler color reaction, but to aluminium nitride formed from nitrogen and aluminium in steel, because aluminium nitride is easily dissolved in alkali solutions, but not so in acids. All nitrogen in common aluminium-killed steel (containing <0.2%Al), however, has been completely determined by applying centrifuge-separation-photometric method. In the case of applying steam-distlling-photometric or titric method, in spite of short time distillation, nitrogen in steel containing much aluminium has been completely determined.
