化学发光法测定原油及渣油中的氮含量

利用ANTEK7000化学发光分析仪，采用直接进样的方式测定原油、常压渣油和减压渣油中的氮含量。阐述方法原理，考察方法的重复性在允许重复性误差范围内；标准样品的回收率在95％-105％；与ASTMD5762．95的稀释法比较，结果一致性较好，两种结果的差值小于84个单位。计算分析过程中由于分析重复性、称量等因素所带来的不确定度分量，考察不确定度分量对合成标准不确定度的贡献，确定合成标准不确定度为3．86mg／kg。合成标准不确定度较小，样品单次分析时间为3-5min。测定范围从0．5mg／kg到质量分数17％。

The Detemination of Nitrogen Content in Crude Oil or Residue by Chemiluminescene Method

The nitrogen content in crude oil, atomaspheric residue , and vacuum residue is determined by using ANTEK 7000 chemiluminescence analyzer in means of direct sampling. The principle is expatiated. The result shows that the repeatability of the method is within the range of the allowable repeatability error. The yield of recovery of slandard sample is 95 % ~ 105 %, and the consistency of results is better and the different of two results is less than 84 in comparison with ASTM D 5762 - 95 dillutiun method. Owning to the standard uncertainty weight brought from repeatability of analysis, weighting and so on during the calculation and analysis. The attribution of uncertainty weight to combined standard uncertainty is considered to determine that combined standard uncertainty is 3.86 mg/kg. The analytic time of a single sample is in the range 3 min to 5 min.Ther nitrogen content of sample determined is in the range 0.5 mg/kg to 17 %.