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。 注1: 由于分析过程中轻组分的蒸发，高蒸气压汽油或轻烃等挥发性样品可能不符合规定的精度。 1.2 本试验方法的范围在混合定量限（PLOQ）值之间（通过符合实践的程序计算） D6259 )第3.2节 mg/kg总硫和循环中最高水平的样品，2822 总硫mg/kg。 1.3 如果校准标准的基质与样品基质或第节中所述的基质校正相匹配，则可以使用本试验方法分析含有氧化物的样品 5. 或 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（第节）中提供 5. ). 1.4 硫含量高于2822的样品 在用适当的溶剂稀释后，可以分析mg/kg（见 5.4 ). 稀释样品硫测定的精度和偏差尚未确定，可能与纯样品的精度和偏差不同（第节） 15 ). 1.5 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，应仔细遵守第5节中的注意事项和建议。 1.6 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.7 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 3.1 . 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 本试验方法提供了在本试验方法范围内精确测量样品总硫含量的方法，只需最少的样品制备和分析员参与。每次分析的典型时间为五分钟。 4.2 了解用于混合汽油的柴油、汽油和炼油厂工艺流的硫含量对于过程控制、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。 4.3 各种联邦、州和地方机构对一些石油产品（包括汽油和柴油）的硫含量进行监管。这些产品中硫的无偏准确测定对于遵守监管标准至关重要。

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 5 or Annex A1 is applied to the results. The conditions for matrix matching and matrix correction are provided in the Interferences section (Section 5 ). 1.4 Samples with sulfur content above 2822 mg/kg can be analyzed after dilution with appropriate solvent (see 5.4 ). 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 15 ). 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 5 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 3.1 . 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 ====== 4.1 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. 4.2 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. 4.3 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.