1.1 这些试验方法包括在空气或氧气环境中加热至规定温度时，测定固体燃烧残留物的质量损失。质量损失可能是由于残渣分解或燃烧产生的水分、碳、硫等的损失。 1.2 单位- 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 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 LOI是指燃烧残留物在空气或氧气环境中加热至高温时的质量损失。 在水泥行业中，LOI一词的使用通常指加热至950℃的样品中的质量损失 °C。对于燃烧工程师来说，LOI一词通常指加热至通常低于950℃的样品中的质量损失 °C。这些试验方法建立了一个程序，用于测定加热到750℃的燃烧残渣的LOI值 °C或950 °C。这些测试方法的LOI值可用于在各种过程和产品中使用燃烧残留物的行业。 5.2 如果加热固体燃烧残渣以估计样品中的可燃碳或未燃烧碳，已证明LOI和未燃烧碳的估计不一定彼此一致，并且LOI不应用作所有燃烧残渣中未燃烧碳的估计。 4. 可以使用试验方法直接测定未燃烧（可燃）碳 D6316 . 5.3 如果将固体燃烧残渣加热以制备灰分，以测定主要和次要元素的质量分数，则使用试验方法中所述的加热程序 D3682 , D4326 和 D6349 ，或750的程序 °C LOI测定在这些试验方法（方法A）中描述。 5.4 如果将固体燃烧残渣加热以制备灰分以测定微量元素的质量分数，则使用试验方法中所述的加热程序 D3683 和 D6357 . 注1: 根据试验方法测定，在熔炉操作或其他燃烧系统中产生的燃烧残留物可能不同于灰分产量 D3174 和 D7582 因为燃烧条件会影响灰分的化学成分和数量。燃烧会导致所有水的排出、碳酸盐中二氧化碳的损失、金属硫化物转化为金属氧化物、金属硫酸盐和硫氧化物以及其他化学反应。同样，点燃燃烧残留物后获得的“灰烬”的成分和数量可能与试验方法不同 D3174 和 D7582 由于不同的加热程序、未燃烧碳的燃烧和残渣中物质的分解，会产生灰分。

1.1 These test methods cover the determination of the mass loss from solid combustion residues upon heating in an air or oxygen atmosphere to a prescribed temperature. The mass loss can be due to the loss of moisture, carbon, sulfur, and so forth, from the decomposition or combustion of the residue. 1.2 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered 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 LOI refers to the mass loss of a combustion residue whenever it is heated in an air or oxygen atmosphere to high temperatures. In the cement industry, use of the term LOI normally refers to a mass loss in a sample heated to 950 °C. To combustion engineers, the term LOI normally refers to mass losses in samples heated to temperatures normally less than 950 °C. These test methods establish a procedure for determining LOI values for combustion residues heated to 750 °C or 950 °C. LOI values from these test methods can be used by industries that utilize combustion residues in various processes and products. 5.2 If the solid combustion residue is heated to estimate the combustible or unburned carbon in the sample, it has been shown that LOI and estimation of unburned carbon do not necessarily agree well with each other and that LOI should not be used as an estimate of unburned carbon in all combustion residues. 4 Direct determination of unburned (combustible) carbon can be carried out using Test Method D6316 . 5.3 If the solid combustion residue is heated to prepare an ash for the determination of the mass fractions of major and minor elements, use the heating procedure described in Test Methods D3682 , D4326 , and D6349 , or the procedures for the 750 °C LOI determination described in these test methods (Method A). 5.4 If the solid combustion residue is heated to prepare an ash for the determination of the mass fractions of trace elements, use the heating procedure described in Test Methods D3683 and D6357 . Note 1: Combustion residues produced in furnace operations or other combustion systems can differ from the ash yield, as determined in Test Methods D3174 and D7582 , because combustion conditions influence the chemistry and amount of ash. Combustion causes an expulsion of all water, the loss of carbon dioxide from carbonates, the conversion of metal sulfides into metal oxides, metal sulfates and sulfur oxides, and other chemical reactions. Likewise, the “ash” obtained after igniting combustion residues can differ in composition and amount from Test Methods D3174 and D7582 ash yields because of different heating procedures, combustion of unburned carbon, and decomposition of materials in the residue.