1.1 本试验方法用于测定提取用于单宁分析的原材料和废材料中的水分含量。样品的含水量在操作上定义为等于因干燥箱中发生的蒸发而经历的重量损失。 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。 1.4 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 本试验方法用于确定拟提取用于单宁分析的材料（原材料或废材料）的含水量。通过本试验方法获得的含水量值用于计算该材料在无水分基础上的其他分析结果。 5.2 样本取自实际提取准备的材料 D6405 . 5.3 鞣制材料含有不同数量的水分，这取决于材料的性质和气候条件，因此必须尽快进行采样，以确保彻底性，以避免水分含量的变化。 5.4 水分测定中可能会出现负误差，因为在本方法的条件下，原料或废材料的某些成分（例如水合盐或与有机结构结合的水）可能会保留水分，或者因为原料或废材料的其他成分（例如单宁）氧化。 5.5 水分测定可能出现正误差，因为在本试验方法的条件下，除水外，原材料或废材料的某些成分可能会挥发。 5.6 众所周知，其他因素也会影响样本释放的挥发性物质（水分）的数量。这些因素包括但不限于:试样的粒径、试样数量、烘箱温度、烘箱中的暴露时间、试样容器的形状和所用烘箱的类型（例如重力或机械对流）。 5.7 由于该试验方法中可能存在未知误差，因此必须严格遵循该方法，以便在实验室内的样本之间和实验室之间的分析中获得可再现的结果。

1.1 This test method is intended for use in determining the moisture content in raw and spent materials that are extracted for tannin analysis. The moisture content of the sample is operationally defined to be equal to the weight loss experienced as a result of the evaporation which occurs in the drying oven. 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 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. 1.4 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 This test method is used to determine the moisture content of materials (raw or spent) that are to be extracted for tannin analysis. The value obtained for moisture content by this test method is used to calculate the results of the other analyses on this material to a moisture-free basis. 5.2 The specimens are obtained from the material prepared for extraction in Practice D6405 . 5.3 Tanning materials contain moisture in varying amounts, depending both on the nature of the material and on the climatic conditions, therefore sampling must be carried out as quickly as is consistent with thoroughness in order to avoid changes in moisture content. 5.4 Negative errors may occur in the moisture determination because under the conditions of this method there may be retention of moisture by certain components (for example, hydrated salts or water bound to organic structures) of the raw or spent material or because of oxidation of other components (for example, tannins) of the raw or spent material. 5.5 Positive errors may occur in the moisture determination because under the conditions of this test method there may be volatilization of certain components of the raw or spent material other than water. 5.6 It is known that other factors can also affect the quantity of volatile matter (moisture) released by the specimen. These factors include but are not limited to: particle size of the test specimen, quantity of test specimen, oven temperature, exposure time in the oven, shape of the specimen container, and type of oven (for example, gravity or mechanical convection) used. 5.7 Because of the possibility of unknown errors in this test method it is essential that the method be followed exactly in order to obtain reproducible results both among specimens within a laboratory and for analyses between laboratories.