1.1 这些测试方法用于测定术语中定义的松木化学产品的酸值 D804 包括妥尔油产品、木材和松香以及其他相关材料。这些测试方法可能不适用于所有改性松香产品。涵盖以下两种测试方法: 1.1.1 电位法（裁判），以及 1.1.2 内部指示器法（替代）。 1.2 电位法适用于浅色和深色产品。应该算是裁判法。内指示剂法仅适用于加德纳色小于12的浅色和中色产品。它应该被认为是替代方法。 1.3 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 1.5 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 3.1 这些试验方法旨在扩大早期版本试验方法的范围，将妥尔油和妥尔油衍生产品纳入试验材料，并将在试验方法中引用 D803 . 3.2 酸值是松木化工产品如妥尔油以及妥尔油分馏得到的产品的重要性质。它是广泛用于测定这些产品的总游离酸含量的测试方法。 3.3 当需要重复性最高的结果时，应使用电位测试方法。

1.1 These test methods are intended for determining the acid number of pine chemical products as defined in Terminology D804 including tall oil products, wood and gum rosin, and other related materials. These test methods may not be applicable to all modified rosin products. Two test methods are covered, as follows: 1.1.1 Potentiometric method (referee), and 1.1.2 Internal indicator method (alternate). 1.2 The potentiometric method is suitable for use with both light- and dark-colored products. It should be considered the referee method. The internal indicator method is suitable for use only with light- and medium-colored products with a Gardner color of less than 12. It should be considered the alternate method. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 ====== 3.1 These test methods are designed to broaden the scope of the earlier editions of the test method by the inclusion of tall oil and tall oil derived products as test materials and will be referenced in Test Methods D803 . 3.2 The acid number is an important property of pine chemical products, such as tall oil, and the products obtained by the fractionation of tall oil. It is the test method widely used to determine the total free acid content of these products. 3.3 The potentiometric test method should be used when the most reproducible results are required.