1.1 本试验方法描述了一种定性方法，用于评估液体消泡剂，用于控制稀释的表面活性剂水溶液中的不良泡沫。本实验室试验方法可适用于含有其他成分（如农用化学品）的水系统。该方法使用国际单位制描述 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 本标准方法并不旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 本试验旨在确定材料减少或消除在稀释水混合物中混合和施用农用化学品期间可能产生的不良泡沫的能力。 5.2 该方法适用于测试液体消泡剂，如“硅乳液”或“有机”型消泡剂。原则上，它也可以用于测试干消泡剂，只需对程序稍作修改。 5.3 该方法可用于确定一种消泡剂与另一种消泡剂的相对有效性。由该方法的用户根据测试消泡剂的实际现场使用来解释结果。 5.4 该方法假设所测试的消泡剂具有足够的耐久性，以在测试期间保持其活性。 5.5 作为发泡剂的十二烷基醚硫酸钠在第 7. ，试剂。如果需要，本试验方法的用户可以选择替代合适的发泡剂。

1.1 This test method describes a qualitative method for the evaluation of liquid defoaming agents used to control undesirable foam in dilute, aqueous surfactant solutions. This laboratory test method may be applied to aqueous systems containing additional components, such as agricultural chemicals. This method is described using SI units 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 This standard method does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 This test is designed to determine the ability of a material to reduce or eliminate undesirable foam that can be generated during the mixing and application of agricultural chemicals in dilute aqueous mixtures. 5.2 This method is useful for testing liquid defoaming agents, such as “silicone emulsion” or “organic” type defoaming agents. In principle, it might also be used to test dry antifoam agents with minor modifications to the procedure. 5.3 This method could be employed to determine the relative effectiveness of one defoaming agent versus another. It is left to the user of this method to interpret the results with respect to the actual field use of the defoaming agents tested. 5.4 This method assumes that the defoaming agent being tested has sufficient durability to maintain its activity for the duration of the test. 5.5 Sodium lauryl ether sulfate as the foaming agent is described in Section 7 , Reagents. If desired the user of this test method may select an alternative suitable foaming agent.