Abstract：The method of determining nitrogen in steel by spark source atomic emission spectrometry was used， and the sample preparation, the argon flushing time and the presparking time were discussed. It was found two sample preparation methods: the sand paper grinding sample and the mill milling sample
does hot affect the precision. It was not easy to control the milling machine milled the column sample, so the experiment adopted sand paper ground sample. At the same time the argon flushing time and the presparking time was set at 5 second. To eliminate interference of coexisting elements, silicon of coexisting element was used as interference correction,and the corrected calibration curves linear were satisfactory, the determination range of nitrogen was 0000 5%0023 0%, the detection limit of nitrogen was 0000 5%, this method was applied in determining the production sample and standard sample that the precisions were investigated, the relative standard deviations (n=11) were all less than 5%; it was adopted that this method and the inert gas fusion thermal conductivity of t test method determined sample at the same time, the results obtained consistent basically, The results proved that no significant difference were observed. The method has been applied to the actual production.
