Abstract：During the simultaneous determination of oxygen, nitrogen and hydrogen in steel, the found results of hydrogen was abnormally higher than those obtained by low temperature hydrogen measurement method. The cause was analyzed and the solution was proposed. The steel sample with very low content of hydrogen was determined by these two methods. The results indicated that the hydrogen impurity in graphite crucible was the main reason to cause the problem above during the simultaneous determination of oxygen, nitrogen and hydrogen. In order to reduce the hydrogen impurity in graphite crucible, the crucible was thermally treated at 450-480 ℃ for 48 h before routine analysis. The blank value of hydrogen in analysis system was reduced from 0.69 μg/g to 0.12 μg/g. Meanwhile, the precision of method was also improved. The standard deviation of blank value (n=11) was 0.06 μg/g. The hydrogen blank was controlled using the experimental method, and the analysis results of hydrogen during simultaneous determination of oxygen, nitrogen and hydrogen in steel were consistent with those obtained by low temperature hydrogen measurement method. When the hydrogen content in steel was in range of 1.2-6.8 μg/g, the relative standard deviations (RSD, n=5) were between 1.0% and 12.2%, which could meet the requirements of ladle analysis.
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