1.1 本规程涵盖了液体提取物溶液的制备，该溶液将用于该提取物的鞣质分析。 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====== 4.1 提取物中的单宁浓度必须降低到分析强度（每升4克单宁）以进行分析。 4.2 植物鞣质提取物是具有不同溶解度的成分的非均质混合物。 4.3 此类提取物的溶解度受温度和浓度的影响，而温度和浓度会影响组分颗粒的分散程度和大小。 4.4 虽然在热水中的溶解度优于在冷水中的溶解度，但适合将提取物溶解并分散在热水中，然后让溶液缓慢冷却至标准室温。

1.1 This practice covers the preparation of a solution of liquid extract that is to be used in the tannin analysis of that extract. 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 ====== 4.1 The concentration of tannin in extracts must be reduced to analytical strength (4 g tannin per L) for analysis. 4.2 Vegetable tannin extracts are heterogeneous mixtures of components with varying solubility. 4.3 The solubility of such extracts is influenced by temperature and concentration, which affect the degree of dispersion and size of the component particles. 4.4 While the solubility is better in hot water than in cold water, it is appropriate to dissolve and disperse an extract in hot water and then let the solution cool slowly to standard room temperature.