1.1 本试验方法包括通过气相色谱法定量测定B-100甲酯中的总单甘酯、总甘油二酯、总甘油三酯以及游离甘油和总甘油。单甘酯的定量范围为0.009 % 至0.77860 % 按质量计，甘油二酯为0.092353%至0.54475% % 按质量计算，甘油三酯为0.00092857 % 至1.3881 % 按质量计算。游离甘油的定量范围为0.0005714 % 至0.019533 % 以质量计，总甘油为0.0090714 % 至0.42767 % 按质量计算。本程序不适用于从月桂油（如椰子油和棕榈仁油）中获得的植物油甲酯。 1.2 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。 1.3 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。 1.4 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 游离甘油和结合甘油的含量反映了生物柴油的质量。由于甘油的分离，游离甘油含量过高可能会导致存储期间或燃油系统中出现问题。总甘油含量高可能导致喷油器结垢，也可能导致喷油嘴、活塞和阀门处形成沉积物。

1.1 This test method covers the quantitative determination of total monoglyceride, total diglyceride, total triglyceride, and free and total glycerin in B-100 methyl esters by gas chromatography. The range of quantitation for monoglyceride is 0.009 % to 0.77860 % by mass, for diglyceride is 0.092353 % to 0.54475 % by mass, and for triglyceride is 0.00092857 % to 1.3881 % by mass. The range of quantitation for free glycerin is 0.0005714 % to 0.019533 % by mass and for total glycerin from 0.0090714 % to 0.42767 % by mass. This procedure is not applicable to vegetable oil methyl esters obtained from lauric oils, such as coconut oil and palm kernel oil. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 Free and bonded glycerin content reflects the quality of biodiesel. A high content of free glycerin may cause problems during storage, or in the fuel system, due to separation of the glycerin. A high total glycerin content can lead to injector fouling and may also contribute to the formation of deposits at injection nozzles, pistons, and valves.