1.1 本试验方法涵盖了残碳量的测定（参见 注1 )在一定条件下石油材料蒸发和热解后形成，旨在提供此类材料相对结焦趋势的一些指示。 1.2 试验结果等同于康拉德森残炭试验（见试验方法 D189 ). 注1: 该程序是对石油材料残炭原始方法和设备的修改，已证明热重分析是另一种适用技术。 2. 然而，当使用热重分析时，操作员有责任建立操作条件以获得同等结果。 1.3 本试验方法适用于在常压下蒸馏时部分分解的石油产品，并测试了0.10的残碳值 % 至30 % （米/米）。预计样品重量低于0.10 % （m/m）残留物应蒸馏以去除90 % 烧瓶装料的（V/V）（见第节 9 ). 10 % 然后用该测试方法测试剩余的底部是否有残碳。 1.4 根据试验方法定义的成灰成分 D482页 ，或样品中存在的非挥发性添加剂将增加残碳值，并作为报告的总残碳值的一部分。 1.5 同样在柴油中，硝酸烷基酯（如硝酸戊酯、硝酸己基或硝酸辛酯）的存在会导致比未处理燃料中观察到的残碳值更高，这可能会导致关于燃料结焦倾向的错误结论。可通过试验方法检测燃料中是否存在硝酸烷基 D4046 . 1.6 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。 1.6.1 例外情况- 6.4 和 6.5 包括英寸-磅单位。 1.7 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。 1.8 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制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 有关特定警告声明，请参阅 8.2.3 和 8.4 . 1.9 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 各种石油材料的残碳值可近似表示材料在类似于试验方法中使用的降解条件下形成碳质沉积物的趋势，并可用于指导某些原料的制造。 然而，在解释结果时需要小心。 5.2 与测试方法相比，该测试方法具有更好的测试条件控制、更小的样本和更少的操作员注意力等优点 D189 ，与之等效。 5.3 最多可以同时运行12个样品，包括当瓶架如所示时的对照样品 图1 仅用于样品分析。 图1 样品瓶架和小瓶

1.1 This test method covers the determination of the amount of carbon residue (see Note 1 ) formed after evaporation and pyrolysis of petroleum materials under certain conditions and is intended to provide some indication of the relative coke forming tendency of such materials. 1.2 The test results are equivalent to the Conradson Carbon Residue test (see Test Method D189 ). Note 1: This procedure is a modification of the original method and apparatus for carbon residue of petroleum materials, where it has been demonstrated that thermogravimetry is another applicable technique. 2 However, it is the responsibility of the operator to establish operating conditions to obtain equivalent results when using thermogravimetry. 1.3 This test method is applicable to petroleum products that partially decompose on distillation at atmospheric pressure and was tested for carbon residue values of 0.10 % to 30 % (m/m). Samples expected to be below 0.10 weight % (m/m) residue should be distilled to remove 90 % (V/V) of the flask charge (see Section 9 ). The 10 % bottoms remaining is then tested for carbon residue by this test method. 1.4 Ash-forming constituents, as defined by Test Method D482 , or non-volatile additives present in the sample will add to the carbon residue value and be included as part of the total carbon residue value reported. 1.5 Also 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 may lead to erroneous conclusions as to the coke-forming propensity of the fuel. The presence of alkyl nitrate in the fuel may be detected by Test Method D4046 . 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6.1 Exception— 6.4 and 6.5 include inch-pound units. 1.7 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. 1.8 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 to determine the applicability of regulatory limitations prior to use. For specific warning statements, see 8.2.3 and 8.4 . 1.9 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 the various petroleum materials serves as an approximation of the tendency of the material to form carbonaceous type deposits under degradation conditions similar to those used in the test method, and can be useful as a guide in manufacture of certain stocks. However, care needs to be exercised in interpreting the results. 5.2 This test method offers advantages of better control of test conditions, smaller samples, and less operator attention compared to Test Method D189 , to which it is equivalent. 5.3 Up to twelve samples may be run simultaneously, including a control sample when the vial holder shown in Fig. 1 is used exclusively for sample analysis. FIG. 1 Sample Vial Holder and Vial