1.1 本试验方法包括测定残碳量( 注1 )在油蒸发和热解后留下，旨在提供一些有关焦炭形成倾向的指示。本试验方法通常适用于在大气压下蒸馏时部分分解的相对不挥发性石油产品。本试验方法还包括测定10 % （V/V）蒸馏残渣（见第节 10 ). 用试验方法测定的含有成灰成分的石油产品 D482页 ，将具有错误的高碳残留物，这取决于形成的灰分量( 注释2和 3. ). 注1: 术语 残炭 在本试验方法中使用，以指定石油产品蒸发和热解过程中形成的含碳残渣。 残渣并非全部由碳组成，而是一种焦炭，可通过热解进一步改变。术语 残炭 仅在尊重其广泛通用性的情况下，才在本试验方法中继续使用。 注2: 通过该试验方法获得的数值与通过试验方法获得的数值不同 D189 ，或试验方法 D4530 . 已推导出近似相关性（参见 图X2.1 )但不必适用于所有可以测试的材料，因为残炭测试适用于多种石油产品。拉姆斯伯顿残炭测试方法仅限于90度以下可移动的样品 °C。 注3: 在柴油燃料中，硝酸戊酯、硝酸己基酯或硝酸辛基酯等烷基硝酸酯的存在会导致比未处理燃料中观察到的残碳值更高，这可能导致关于焦炭的错误结论- 燃料的形成倾向。可通过试验方法检测燃料中是否存在硝酸烷基 D4046 . 注4: 第节中的测试程序 10 正在修改以允许使用100 毫升体积自动蒸馏装置。目前没有可用于该程序的精度数据，但正在计划一次循环以开发精度数据。250人 第节中描述的mL体积球蒸馏方法 10 用于测定10 % 蒸馏残渣被视为仲裁试验。 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 警告 -许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。 处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.4 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。 1.5 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《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 燃烧器燃料的残碳值粗略估计了燃料在蒸发罐式和套筒式燃烧器中形成沉积物的趋势。类似地，如果不存在烷基硝酸盐（或如果存在，如果在不含添加剂的基础燃料上进行试验），柴油的残碳大约与燃烧室沉积物相关。 5.2 机油的残碳值一度被视为指示机油在发动机燃烧室中可能形成的含碳沉积物的数量，但由于许多机油中存在添加剂，因此现在认为其重要性值得怀疑。例如，成灰洗涤剂添加剂可以增加油的残碳值，但通常会减少其形成沉积物的趋势。 5.3 瓦斯油的残碳值可用于指导瓦斯油制气，而原油残渣、钢瓶和光亮油的残碳值可用于制造润滑剂。

1.1 This test method covers the determination of the amount of carbon residue ( Note 1 ) left after evaporation and pyrolysis of an oil, and it is intended to provide some indication of relative coke-forming propensity. This test method is generally applicable to relatively nonvolatile petroleum products which partially decompose on distillation at atmospheric pressure. This test method also covers the determination of carbon residue on 10 % (V/V) distillation residues (see Section 10 ). Petroleum products containing ash-forming constituents as determined by Test Method D482 , will have an erroneously high carbon residue, depending upon the amount of ash formed ( Notes 2 and 3 ). Note 1: The term carbon residue is used throughout this test method to designate the carbonaceous residue formed during evaporation and pyrolysis of a petroleum product. The residue is not composed entirely of carbon, but is a coke which can be further changed by pyrolysis. The term carbon residue is continued in this test method only in deference to its wide common usage. Note 2: Values obtained by this test method are not numerically the same as those obtained by Test Method D189 , or Test Method D4530 . Approximate correlations have been derived (see Fig. X2.1 ) but need not apply to all materials which can be tested because the carbon residue test is applicable to a wide variety of petroleum products. The Ramsbottom Carbon Residue test method is limited to those samples that are mobile below 90 °C. Note 3: In diesel fuel, the presence of alkyl nitrates such as amyl nitrate, hexyl nitrate, or octyl nitrate, causes a higher carbon residue value than observed in untreated fuel, which can lead to erroneous conclusions as to the coke-forming propensity of the fuel. The presence of alkyl nitrate in the fuel can be detected by Test Method D4046 . Note 4: The test procedure in Section 10 is being modified to allow the use of a 100 mL volume automated distillation apparatus. No precision data is available for the procedure at this time, but a round robin is being planned to develop precision data. The 250 mL volume bulb distillation method described in Section 10 for determining carbon residue on a 10 % distillation residue is considered the referee test. 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 WARNING —Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use Caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 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 The carbon residue value of burner fuel serves as a rough approximation of the tendency of the fuel to form deposits in vaporizing pot-type and sleeve-type burners. Similarly, provided alkyl nitrates are absent (or if present, provided the test is performed on the base fuel without additive) the carbon residue of diesel fuel correlates approximately with combustion chamber deposits. 5.2 The carbon residue value of motor oil, while at one time regarded as indicative of the amount of carbonaceous deposits a motor oil would form in the combustion chamber of an engine, is now considered to be of doubtful significance due to the presence of additives in many oils. For example, an ash-forming detergent additive can increase the carbon residue value of an oil yet will generally reduce its tendency to form deposits. 5.3 The carbon residue value of gas oil is useful as a guide in the manufacture of gas from gas oil, while carbon residue values of crude oil residuum, cylinder and bright stocks, are useful in the manufacture of lubricants.