1.1 本试验方法包括使用便携式中红外光谱仪测定传统柴油和可再生柴油混合燃料中的脂肪酸甲酯（FAME）生物柴油和甘油三酯（TAG）浓度。 1.2 该方法适用于生物柴油浓度为3%的样品 % 至40 % 按体积计算。此外，它适用于生物柴油浓度为2 % 至27 % 按体积计，其中甘油三酯浓度为1 % 至10 % 按体积计算。来自2的甘油三酯 % 至10 % 体积可在生物柴油浓度为3的柴油样品中测定 % 至27 % 按体积计算。FAME和甘油三酯可以在这些规定的范围外同时测定，但规定的精度估计不适用。 1.3 如果标签浓度低于0，该方法无法区分标签和FAME。 142×测量的FAME浓度。 1.4 本程序不适用于测定脂肪酸乙酯（FAEE）形式的生物柴油浓度，请参阅第节 6. 进一步讨论可能的干扰。 1.5 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。 1.6 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。 1.7 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 生物柴油是一种燃料商品，主要用作与柴油混合的增值成分。 5.2 本试验方法适用于含有FAME的柴油和生物柴油混合物的生产和分销中的质量控制。 5.3 在任何ASTM规范中，燃料中使用甘油三酯都不允许用于运输应用。该试验方法可量化生物柴油混合物中的甘油三酯浓度，从而检测出不合规格的混合物。 5.4 该测试方法快速、简单、价格低廉且无需样品制备。

1.1 This test method covers the determination of fatty acid methyl ester (FAME) biodiesel and triglyceride (TAG) concentrations in traditional diesel and renewable diesel fuel blends using a portable mid-infrared spectrometer. 1.2 The method applies to samples with biodiesel concentrations from 3 % to 40 % by volume. Additionally, it applies to samples with biodiesel concentrations from 2 % to 27 % by volume which contain triglycerides concentrations from 1 % to 10 % by volume. Triglycerides from 2 % to 10 % by volume can be determined in samples of diesel having biodiesel concentrations from 3 % to 27 % by volume. FAME and triglyceride can be simultaneously determined outside these stated ranges, but the stated precision estimates do not apply. 1.3 The method is not able to distinguish TAG and FAME if the TAG concentrations is below 0.142× the measured FAME concentrations. 1.4 This procedure is not appropriate for the determination of the concentration of biodiesel in the form of fatty acid ethyl esters (FAEE), see Section 6 for further discussion of possible interferences. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 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. 1.7 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 Biodiesel is a fuel commodity primarily used as a value-added blending component with diesel fuel. 5.2 This test method is applicable for quality control in the production and distribution of diesel fuel and biodiesel blends containing FAME. 5.3 The use of triglycerides in fuels is not approved for transportation applications within any ASTM specification. This test method allows the quantification of triglyceride concentration in biodiesel blends, thus enabling detection of out-of-specification blending. 5.4 This test method is fast, simple to run, inexpensive and requires no sample preparation.