1.1 本试验方法规定了一种能量色散X射线荧光（EDXRF）方法，用于测定浓度范围为3 mg/kg至942 毫克/千克。 1.1.1 通过实验室间试验结果的统计分析得出的本试验方法的合并定量限为3 mg/kg硫。 1.1.2 本试验方法适用于汽油、富氧汽油（RFG）、柴油、含有20%（体积）生物柴油的柴油/生物柴油混合物、煤油、喷气燃料、含有5%（体积）的生物柴油和2号家用取暖油的喷气燃料/生物柴油混合物。 1.2 该测试方法的一个基本假设是标准矩阵和样本矩阵匹配良好。基质失配可由样品和标准品之间的C/H比差异或其他杂原子的存在引起。 1.3 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.3.1 优选的浓度单位是mg/kg硫。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。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，并确定监管限制的适用性。 1.5 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 本试验方法提供了汽车中总硫的测量。 2个加热和喷气燃料，最少需要样品制备。典型的分析时间为180 s至360 s每个样本。 5.2 汽车、二号加热和喷气燃料的质量可能与硫的含量有关。硫浓度的知识对于加工来说是必要的。联邦、州和地方机构也颁布了限制某些燃料中硫含量的规定。 5.3 如果本试验方法适用于基质与本试验方法中规定的校准材料明显不同的石油材料，则第节中的注意事项和建议 6. 在解释结果时应遵守。

1.1 This test method specifies an energy-dispersive X-ray fluorescence (EDXRF) method for the determination of total sulfur in automotive, No. 2 heating, and jet fuels with a concentration range of 3 mg/kg to 942 mg/kg. 1.1.1 The pooled limit of quantitation of this test method as obtained by statistical analysis of inter laboratory test results is 3 mg/kg sulfur. 1.1.2 This test method is applicable to gasoline, oxygen enriched gasoline (RFG), diesel, diesel/biodiesel blends containing up to twenty volume percent biodiesel, kerosene, jet fuel, jet fuel/biodiesel blends containing up to five volume percent biodiesel and No. 2 home heating oil. 1.2 A fundamental assumption in this test method is that the standard and sample matrix is well matched. Matrix mismatch can be caused by C/H ratio differences between samples and standards or by the presence of other heteroatoms. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 The preferred concentration units are mg/kg sulfur. 1.4 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. 1.5 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 measurement of total sulfur in automotive, No. 2 heating, and jet fuels with a minimum of sample preparation. A typical analysis time is 180 s to 360 s per sample. 5.2 The quality of automotive, No. 2 heating, and jet fuel can be related to the amount of sulfur present. Knowledge of sulfur concentration is necessary for processing purposes. There are also regulations promulgated in federal, state, and local agencies that restrict the amount of sulfur present in some fuel. 5.3 If this test method is applied to petroleum materials with matrices significantly different from the calibration materials specified in this test method, the cautions and recommendations in Section 6 should be observed when interpreting the results.