1.1 本试验方法包括通过单色波长色散X射线荧光光谱法（MWDXRF）测定芳烃及其衍生物和相关化学品中的氯。 1.2 本试验方法适用于氯浓度为10 mg/kg的样品。通过用合适的溶剂定量稀释样品，可以确定较高的氯浓度。检测限（LOD）为0.2 mg/kg，定量限为0.7 mg/kg。通过仔细的分析技术或重复测量，或两者兼有，该方法可用于成功分析LOD以下的浓度。 注1: 最大值是来自实验室间研究（ILS）的最高浓度，LOD和LOQ是根据性能测试程序（PTP）数据计算的。见表3。 1.3 在使用该方法确定测试结果是否符合适用规范时，应根据四舍五入对结果进行四舍五入- 非实践方法 E29年 . 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。有关具体的危险信息，请参阅第节 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法提供了在最少样品制备和分析员参与的情况下精确测量芳烃中氯含量的方法。 每次分析的典型时间为五到十分钟。 5.2 了解芳烃的氯含量对于过程控制、预测和控制操作问题（如装置腐蚀和催化剂中毒）以及将产品混合到商品规范中非常重要。 5.3 各种联邦、州和地方机构对一些石油产品（包括芳烃）的氯含量进行监管。芳烃中氯的无偏准确测定对于遵守监管标准至关重要。 5.4 当样品的元素组成与用于制备校准曲线的校准标准显著不同时，第节中的注意事项和建议 6. 应仔细观察。

1.1 This test method covers the determination of chlorine by monochromatic wavelength-dispersive X-ray fluorescence (MWDXRF) spectrometry in aromatic hydrocarbons, their derivatives, and related chemicals. 1.2 This test method is applicable to samples with chlorine concentrations to 10 mg/kg. Higher chlorine concentrations can be determined by quantitatively diluting the sample with a suitable solvent. The limit of detection (LOD) is 0.2 mg/kg and the limit of quantitation is 0.7 mg/kg. With careful analytical technique or the measurement of replicates, or both, this method can be used to successfully analyze concentrations below the LOD. Note 1: The maximum is the highest concentration from the interlaboratory study (ILS) and the LOD and LOQ were calculated from Performance Testing Program (PTP) data. See Table 3. 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 information, 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 provides for the precise measurement of the chlorine content of aromatics with minimal sample preparation and analyst involvement. The typical time for each analysis is five or ten minutes. 5.2 Knowledge of the chlorine content of aromatics is important for process control as well as the prediction and control of operational problems such as unit corrosion and catalyst poisoning, and in the blending of products to commodity specifications. 5.3 Various federal, state, and local agencies regulate the chlorine content of some petroleum products, including aromatics. Unbiased and precise determination of chlorine in aromatics is critical to compliance with regulatory standards. 5.4 When the elemental composition of the samples differ significantly from the calibration standards used to prepare the calibration curve, the cautions and recommendation in Section 6 should be carefully observed.