1.1 本试验方法涵盖芳香烃、其衍生物和相关化学品中总氮的测定。 1.2 本试验方法适用于氮浓度高达1.2 mg/kg的样品。检测限（LOD）为0.04 mg/kg N，定量限（LOQ）为0.13 mg/kg N。对于较高的氮浓度，请参阅测试方法 D4629 通过仔细的分析技术，该方法可用于成功分析低于当前范围的浓度（见 附录X1 ). 附注1: 使用ASTM研究报告编号RR:D16-1044中的数据计算LOD和LOQ。 2 附注2: 见 附录X2 有关LOD计算的其他信息。 1.3 使用该方法确定试验结果是否符合适用的质量标准；结果应按照四舍五入-off练习方法 E29 . 1.4 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 有关具体危害陈述，请参见章节 9 . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。======意义和用途====== 5.1 该测试方法可用于检测和定量生产工艺中使用或生产的轻质芳烃中浓度为0.1 mg N/kg至1.2 mg N/kg的含氮化合物。这些含氮化合物在芳香族成品中是不期望的，并且可以用于设定用于测定芳香烃中的总氮含量的规格。 5.2 该测试方法需要在检测器处使用减压。真空损失或压力波动会影响检测器的灵敏度和测定小于1mg N/kg的氮浓度的能力。

1.1 This test method covers the determination of total nitrogen in aromatic hydrocarbons, their derivatives, and related chemicals. 1.2 This test method is applicable to samples with nitrogen concentrations up to 1.2 mg/kg. The Limit of Detection (LOD) is 0.04 mg/kg N and the Limit of Quantitation (LOQ) is 0.13 mg/kg N. For higher nitrogen concentrations refer to Test Method D4629 . With careful analytical technique, this method can be used to successfully analyze concentrations below the current scope (see Appendix X1 ). Note 1: LOD and LOQ were calculated using data in ASTM Research Report No. RR:D16-1044. 2 Note 2: See Appendix X2 for additional information on calculation of LOD. 1.3 In determining the conformance of the test results using this method to applicable specifications; results shall be rounded off in accordance with the rounding-off method of Practice E29 . 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is useful to detect and quantify nitrogen-containing compounds at a concentration of 0.1 mg N/kg to 1.2 mg N/kg in light aromatic hydrocarbons used or produced in manufacturing process. These nitrogen-containing compounds are undesirable in finished aromatic products and may be used in setting specification for determining the total nitrogen content in aromatic hydrocarbons. 5.2 This test method requires the use of reduced pressure at the detector. Loss of vacuum or pressure fluctuations impact the sensitivity of the detector and the ability to determine nitrogen concentrations less than 1 mg N/kg.