1.1 本试验方法包括两个程序，用于确定航空汽油和航空涡轮燃料中是否存在悬浮自由水、固体颗粒和其他污染物。 1.1.1 这两种程序主要用于燃料在装卸温度下的现场试验。 1.1.2 程序A使用透明样品容器；程序B使用不透明容器。 1.2 这两种程序都是污染检测的快速方法，包括烟雾外观和微粒存在的评级。 1.3 以国际单位制表示的数值应视为标准。 括号中给出的值仅供参考。 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 试验方法中的两个程序提供了现场检测游离水和固体污染物或任何其他视觉上明显污染的快速方法。 这两种方法中任何一种的不确定或边际结果通常会导致以下方法的性能: D2276 , D5452 或 D3240 用于定量测定污染物。 5.1.1 外观试验中的颗粒测定对取样程序很敏感。例如，少量颗粒的存在可能表明未冲洗样品线以提供代表性样品。然而，即使是少量粒子的持续存在也可能是根据情况进行进一步调查的原因。 5.2 经验表明，使用透明瓶子的经验丰富的测试人员可以检测到40 燃油中游离悬浮水的ppm。因此，额定值为 清澈明亮 仍然可能无法通过定量方法设置的下限。评级器也难以分辨小于40μm的颗粒。较小的颗粒必须通过其他目视方法来确定，例如 D2276 , D5452 或手册5中列出的化学现场测试。 5. 5.3 经验表明，白色陶瓷桶中燃油的外观是检测染料污染或其他异常变色的最合适方法。 在美国，白瓷桶用于检测染料。

1.1 This test method covers two procedures for establishing the presence of suspended free water, solid particulate, and other contaminants in aviation gasoline and aviation turbine fuels. 1.1.1 Both procedures are intended primarily for use as field tests with the fuel at handling temperature. 1.1.2 Procedure A uses transparent sample containers; Procedure B uses opaque containers. 1.2 Both procedures are rapid methods for contamination detection and include ratings of haze appearance and particulate presence. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 The two procedures in the test method provide rapid methods for field detection of free water and solid contaminants, or any other visually apparent contamination. Uncertain or marginal results by either of these methods would normally result in the performance of methods such as D2276 , D5452 , or D3240 for quantitative determination of contaminants. 5.1.1 Particulate determination in appearance tests is sensitive to sampling procedures. The presence of a small number of particles may indicate, for example, that the sample line was not flushed to provide a representative sample. The persistent presence of even a small number of particles, however, may be cause for further investigation depending on the situation. 5.2 Experience has shown that an experienced tester using a clear bottle can detect as little as 40 ppm of free, suspended water in the fuel. Thus, a fuel rated as clear and bright can still fail lower limits set by quantitative methods. A rater will also have difficulty resolving particles smaller than 40 μm. Smaller particles must be determined by other than visual methods such as D2276 , D5452 or chemical field tests listed in Manual 5. 5 5.3 Experience has shown the visual appearance of fuel in a white porcelain bucket to be the most suitable method for the detection of dye contamination or other unusual discoloration. In the U.S., the white porcelain bucket is used to detect the dye.