1.1 这些试验方法包括通过电感耦合等离子体（ICP）原子发射光谱法测定原油和残余燃料中的镍、钒和铁。提出了两种不同的测试方法。 1.2 试验方法A（章节 7 – 11 和 18 – 22 )— ICP用于分析溶解在有机溶剂中的样品。本试验方法使用油溶性金属进行校准，并不旨在定量测定或检测不溶性颗粒。 1.3 试验方法B（章节 12 – 22 )— ICP用于分析用酸分解的样品。 1.4 这些试验方法所涵盖的浓度范围由仪器的灵敏度、用于分析的样本量和稀释量确定。 具体说明见 15.2 . 通常，低浓度限值为每公斤十分之几毫克。提供了第节中规定的浓度范围的精度数据 21 . 1.5 以国际单位制表示的数值应视为标准值。 1.5.1 例外情况- 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====== 4.1 这些试验方法包括在单个程序中测定原油和渣油中的镍、钒和铁。这些试验方法是对试验方法的补充 D1548 ，仅包括钒的测定。 4.2 当燃料燃烧时，燃料中的钒会形成腐蚀性化合物。原油的价值部分可以通过镍、钒和铁的浓度来确定。石油馏分中痕量的镍和钒会在加工过程中使催化剂失活。这些试验方法提供了一种测定镍、钒和铁浓度的方法。

1.1 These test methods cover the determination of nickel, vanadium, and iron in crude oils and residual fuels by inductively coupled plasma (ICP) atomic emission spectrometry. Two different test methods are presented. 1.2 Test Method A (Sections 7 – 11 and 18 – 22 )— ICP is used to analyze a sample dissolved in an organic solvent. This test method uses oil-soluble metals for calibration and does not purport to quantitatively determine or detect insoluble particulates. 1.3 Test Method B (Sections 12 – 22 )— ICP is used to analyze a sample that is decomposed with acid. 1.4 The concentration ranges covered by these test methods are determined by the sensitivity of the instruments, the amount of sample taken for analysis, and the dilution volume. A specific statement is given in 15.2 . Typically, the low concentration limits are a few tenths of a milligram per kilogram. Precision data are provided for the concentration ranges specified in Section 21 . 1.5 The values stated in SI units are to be regarded as standard. 1.5.1 Exception— 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 ====== 4.1 These test methods cover, in single procedures, the determination of Ni, V, and Fe in crude oils and residual oils. These test methods complement Test Method D1548 , which covers only the determination of vanadium. 4.2 When fuels are combusted, vanadium present in the fuel can form corrosive compounds. The value of crude oils can be determined, in part, by the concentrations of nickel, vanadium, and iron. Nickel and vanadium, present at trace levels in petroleum fractions, can deactivate catalysts during processing. These test methods provide a means of determining the concentrations of nickel, vanadium, and iron.