1.1 本测试方法涵盖了通过单色波长色散X射线荧光(MWDXRF)光谱法测定单相汽油、柴油、用于混合汽油和柴油的炼油厂工艺流、喷气燃料、煤油、生物柴油、生物柴油混合物和汽油-乙醇混合物中的总硫。 附注1: 挥发性样品，如高蒸汽压汽油或轻质碳氢化合物，由于分析过程中轻质成分的蒸发，可能不符合规定的精度。 1.2 该检测方法的范围在合并定量限(PLOQ)值之间（通过与实践一致的程序计算 D6259 ）的3.2毫克/千克总硫和循环赛中最高水平的样品，2822毫克/千克总硫。 1.3 如果校准标准品的基质与样品基质或第节中描述的基质校正相匹配，则可以使用该测试方法分析含含氧化合物的样品 6 or 附件A1 应用于结果。矩阵匹配和矩阵校正的条件在干扰部分（部分 6 ). 1.4 硫含量高于2822毫克/千克的样品可用适当溶剂稀释后进行分析（见 6.4 ).稀释样品中硫测定的精密度和偏差尚未确定，可能与纯样品的精密度和偏差不同（章节 16 ). 1.5 当样品的元素组成与用于制备校准曲线的校准标准品有显著差异时，第节中的注意事项和建议 6 应仔细观察。 1.6 以SI单位表示的值应被视为标准。括号中给出的值仅供参考。 1.7 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）。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。 有关具体危害信息，请参见 4.1 . 1.8 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 本试验方法提供了本试验方法范围内样品总硫含量的精确测量，只需最少的样品制备和分析人员参与。每次分析的典型时间为五分钟。5.2 了解柴油燃料、汽油和用于混合汽油的炼油厂工艺流的硫含量对于过程控制以及预测和控制操作问题（例如单元腐蚀和催化剂中毒）以及将产品混合到商品规格中是重要的。 5.3 各种联邦、州和地方机构管理一些石油产品的硫含量，包括汽油和柴油。公正、精确地测定这些产品中的硫对于符合监管标准至关重要。

1.1 This test method covers the determination of total sulfur by monochromatic wavelength-dispersive X-ray fluorescence (MWDXRF) spectrometry in single-phase gasoline, diesel fuel, refinery process streams used to blend gasoline and diesel, jet fuel, kerosine, biodiesel, biodiesel blends, and gasoline-ethanol blends. Note 1: Volatile samples such as high-vapor-pressure gasolines or light hydrocarbons might not meet the stated precision because of the evaporation of light components during the analysis. 1.2 The range of this test method is between the pooled limit of quantitation (PLOQ) value (calculated by procedures consistent with Practice D6259 ) of 3.2 mg/kg total sulfur and the highest level sample in the round robin, 2822 mg/kg total sulfur. 1.3 Samples containing oxygenates can be analyzed with this test method provided the matrix of the calibration standards is either matched to the sample matrices or the matrix correction described in Section 6 or Annex A1 is applied to the results. The conditions for matrix matching and matrix correction are provided in the Interferences section (Section 6 ). 1.4 Samples with sulfur content above 2822 mg/kg can be analyzed after dilution with appropriate solvent (see 6.4 ). The precision and bias of sulfur determinations on diluted samples has not been determined and may not be the same as shown for neat samples (Section 16 ). 1.5 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. 1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.7 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 4.1 . 1.8 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 total sulfur content of samples within the scope of this test method with minimal sample preparation and analyst involvement. The typical time for each analysis is five minutes. 5.2 Knowledge of the sulfur content of diesel fuels, gasolines, and refinery process streams used to blend gasolines 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 sulfur content of some petroleum products, including gasoline and diesel fuel. Unbiased and precise determination of sulfur in these products is critical to compliance with regulatory standards.