1.1 本试验方法用于测定鞣质提取物、植物鞣制材料水提取物或鞣制液溶液中可溶性固体和不溶物的数量。本试验方法适用于分析液体、固体、糊状和粉末单宁提取物，以及原材料或废材料的水提取物。 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 本试验方法用于测定可溶固体和不溶固体在鞣质提取物溶液或为鞣质分析制备的原材料或废材料水提取物中的比例。 5.2 样品是由鞣质提取物制备的分析溶液或由原材料或废材料制备的水提取物溶液的等分试样。 5.3 可溶性固体是指溶解在水中并通过将一层高岭土膏沉积在标准滤纸上制备的过滤器的总固体部分。 5.4 不溶物是指总固体中不通过由高岭土膏层制备的标准滤纸的部分。 5.5 该测试方法的结果取决于许多变量，但尤其取决于: 5.5.1 溶液制备和储存的温度条件以及进行电流分析的温度； 5.5.2 沉积在滤纸上的高岭土膏层的均匀性和稠度； 5.5.3 溶液从移液管流出的速率；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重复的结果。

1.1 This test method is intended for use in determining the quantity of soluble solids and insolubles in solutions of tannin extracts, water extracts of vegetable tanning materials, or tanning liquors. This test method is applicable to the analysis of liquid, solid, pasty, and powdered tannin extracts and to the water extracts of raw or spent materials. 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 proportion of the total solids which are soluble solids and that proportion which are insoluble solids in a solution of tannin extract or in the water extract from raw or spent materials prepared for tannin analysis. 5.2 The specimens are aliquots from the analytical solutions prepared from tannin extracts or the water extract solutions prepared from raw or spent materials. 5.3 The soluble solids are defined as the portion of the total solids which are dissolved in the water and pass through a filter prepared by depositing a layer of Kaolin paste onto a standard filter paper. 5.4 The insolubles are defined as the portion of the total solids which do not pass through the standard filter paper prepared with the layer of Kaolin paste. 5.5 The results of this test method are dependent on a great many variables but particularly upon: 5.5.1 The temperature conditions under which the solutions were prepared and stored and the temperature at which the current analysis is performed; 5.5.2 The uniformity and consistency of the Kaolin paste layer deposited onto the filter paper; 5.5.3 The rate of solution run-out from the pipette; etc. It is, therefore, essential that the method be followed exactly in order to obtain reproducible results both among specimens within a laboratory and for analyses between laboratories.