1.1 本试验方法包括伏安法测定浓度为0.0075 % 通过在生成的伏安图中测量特定电压下的电流量，以质量计达到新油中发现的浓度。 1.2 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.3 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 新涡轮机油中受阻酚和芳香胺抗氧化剂的定量测定测量了添加到机油中的这些化合物的量，以防止氧化。除酚类外，涡轮机油还可以与其他抗氧化剂（如胺）配合使用，从而延长机油寿命。 在使用中的油中，该测定测量了氧化降低其初始浓度后剩余的原始（受阻酚和芳香胺）抗氧化剂的量。本试验方法的设计或目的不是检测在油的热应力和氧化应力过程中形成的所有抗氧化剂中间体，这些中间体被认为对在用油的剩余使用寿命有一定贡献。它也不能衡量石油的总体稳定性，而石油的稳定性取决于所有物种的总贡献。在对in的剩余使用寿命作出最终判断之前- 工作油，这可能导致更换储油器，建议执行额外的分析技术（根据测试方法 D6224 和 第4378页 ; 另请参见测试方法 2272美元 )具有测量在用油的剩余氧化寿命的能力。 5.1.1 本试验方法适用于ISO 6743第4部分表中规定的非锌型汽轮机油 1.这些是精炼矿物油，含有防锈剂和氧化抑制剂，但不含抗磨添加剂。 5.2 该测试也适用于制造控制和规范验收。 5.3 当对用受阻酚和芳香胺抗氧化剂的典型协同混合物抑制的透平油进行伏安分析时，产生的伏安图电流在8 s至12 s（或0。 8. V至1.2 V外加电压）（参见 注1 )对于芳香胺，产生的伏安图的电流在13 s和16 s（或1.3 V至1.6 V外加电压）（参见 注1 )中性丙酮测试溶液中受阻酚类( 图1 : x（x） -轴1s＝0.1V）。伏安分析检测到的受阻酚抗氧化剂包括但不限于2,6-di- 第三代 -丁基-4-甲基苯酚；2,6-二- 第三代 -丁基苯酚；和4,4'-亚甲基双（2,6-di- 第三代 -丁基苯酚）。通过伏安分析检测的芳香胺抗氧化剂包括但不限于苯基α-萘胺和烷基化二苯胺。 注1: 相对于参考电极列出的电压。伏安图如 图。1和 2. 用铂参比电极和0.1V/s的电压扫描速率获得。 图2 空白响应为零的碱性试验溶液中受阻酚伏安响应 注1: x（x） -轴=时间（秒）和 y -轴为当前（任意单位），顶部行位于 图2 显示新鲜油。 5.4 对于仅含有芳香胺作为抗氧化剂的透平油，产生的伏安图电流仅在8 s到12 s（或0.8 V至1.2 V施加电压）（参见 注1 )对于芳香胺，使用中性丙酮测试溶液（ 图1 ). 5.5 对于仅含有受阻酚类抗氧化剂的涡轮机油，最好使用碱性酒精测试溶液而不是中性丙酮测试溶液，因为产生的伏安图电流在3 s到6 s（或0.3 V至0.6 V施加电压）（参见 注1 )在碱性酒精测试溶液中( 图2 : x（x） -轴1秒=0.1 V） D6810型 .

1.1 This test method covers the voltammetric determination of hindered phenol and aromatic amine antioxidants in new or in-service type non-zinc turbine oils in concentrations from 0.0075 % by mass up to concentrations found in new oils by measuring the amount of current flow at a specified voltage in the produced voltammogram. 1.2 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. 1.3 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 quantitative determination of hindered phenol and aromatic amine antioxidants in a new turbine oil measures the amount of these compounds that has been added to the oil as protection against oxidation. Beside phenols, turbine oils can be formulated with other antioxidants such as amines which can extend the oil life. In in-service oil, the determination measures the amount of original (hindered phenol and aromatic amine) antioxidants remaining after oxidation has reduced its initial concentration. This test method is not designed or intended to detect all of the antioxidant intermediates formed during the thermal and oxidative stressing of the oils, which are recognized as having some contribution to the remaining useful life of the in-service oil. Nor does it measure the overall stability of an oil, which is determined by the total contribution of all species present. Before making final judgment on the remaining useful life of the in-service oil, which might result in the replacement of the oil reservoir, it is advised to perform additional analytical techniques (as in accordance with Test Methods D6224 and D4378 ; see also Test Method D2272 ), having the capability of measuring remaining oxidative life of the in-service oil. 5.1.1 This test method is applicable to non-zinc type of turbine oils as defined by ISO 6743 Part 4, Table 1. These are refined mineral oils containing rust and oxidation inhibitors, but not antiwear additives. 5.2 The test is also suitable for manufacturing control and specification acceptance. 5.3 When a voltammetric analysis is obtained for a turbine oil inhibited with a typical synergistic mixture of hindered phenol and aromatic amine antioxidants, there is an increase in the current of the produced voltammogram between 8 s to 12 s (or 0.8 V to 1.2 V applied voltage) (see Note 1 ) for the aromatic amines, and an increase in the current of the produced voltammogram between 13 s and 16 s (or 1.3 V to 1.6 V applied voltage) (see Note 1 ) for the hindered phenols in the neutral acetone test solution ( Fig. 1 : x -axis 1 s = 0.1 V). Hindered phenol antioxidants detected by voltammetric analysis include, but are not limited to, 2,6-di- tert -butyl-4-methylphenol; 2,6-di- tert -butylphenol; and 4,4'-Methylenebis (2,6-di- tert -butylphenol). Aromatic amine antioxidants detected by voltammetric analysis include, but are not limited to, phenyl alpha naphthylamines, and alkylated diphenylamines. Note 1: Voltages listed with respect to reference electrode. The voltammograms shown in Figs. 1 and 2 were obtained with a platinum reference electrode and a voltage scan rate of 0.1 V/s. FIG. 2 Hindered Phenol Voltammetric Response in Basic Test Solution with Blank Response Zeroed Note 1: x -axis = time (seconds) and y -axis is current (arbitrary units) with top line in Fig. 2 showing the fresh oil. 5.4 For turbine oil containing only aromatic amines as antioxidants, there will only be an increase in the current of the produced voltammogram between 8 s to 12 s (or 0.8 V to 1.2 V applied voltage) (see Note 1 ) for the aromatic amines, by using the neutral acetone test solution (first peak in Fig. 1 ). 5.5 For turbine oils containing only hindered phenolic antioxidants, it is preferable to use a basic alcohol test solution rather than the neutral acetone test solutions, as there is an increase in the current of the produced voltammogram between 3 s to 6 s (or 0.3 V to 0.6 V applied voltage) (see Note 1 ) in basic alcohol test solution ( Fig. 2 : x -axis 1 second = 0.1 V) in accordance with Test Method D6810 .