1.1 本规程涵盖了在测试纺织品的标准大气中进行调节后，在水分平衡条件下测定原棉和皮棉中的总水量（游离和结合）。 注1: 对于其他测定皮棉中水分的方法，如果没有规定调节水分平衡，请参阅测试方法 D2495 和 D1348 . 1.2 本规程要求使用烘箱蒸发去除纤维基质中的所有水分，卡尔·费歇尔（KF）容量滴定法测定含水量和回潮率，控制电流电位法检测终点。 1.3 本规程不适用于电位（零电流）和库仑卡尔费休滴定仪（见试验方法 D1533 , D4377 和 E1064 )本规程也不适用于棉花的甲醇提取物（见试验方法 D1348 ). 1.4 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。 1.5 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。 有关具体的预防警告，请参阅 9.1 . 1.6 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 根据本规程测定的原棉或皮棉的含水量（根据所需试剂体积计算）可能大于、等于或小于通过标准烘箱干燥方法测量的含水量。 这些差异在商业交易中可能具有重要意义( 1- 3. ) 4. （另请参见 附录X2 ). 该方法得出的含水量不应视为与含水量相同的属性。 5.2 使用容量和库仑卡尔费休试剂的标准试验方法是测定水的两种最广泛使用的程序。 5.3 容量法通常用于在浓度的质量百分比范围内对水进行常规测定。如果样品含水量非常低，则应考虑库仑法（见试验方法 D1533 , E1064 ). 5.4 本测试棉花含水量的实施规程可用于商业运输皮棉的验收测试、制造控制和快速间接传感器的校准，以测量水分。 5.5 由于棉花的物理特性受其含水量的显著影响，因此需要有关棉花含水量的信息。 水含量或其回收率的变化会影响许多材料的质量，从而影响其市场价值。 5.6 本规程中用于分析样本的卡尔·费瑟试剂的观察体积表示在供应空气的烘箱中没有副反应的情况下的水( 3. ). 注2: 在两个实验室烘箱和一个供应空气的热重分析烘箱中，已经证明了棉花中的副反应混淆了水引起的实际重量损失( 3. ). 这导致了基于干燥质量损失的棉花实际含水量的近似值。如果烘箱干燥的含水量与卡尔·费歇尔滴定法测得的含水量一致，则由于含水量值中存在正负偏差，一对一的对应关系可能是一致的。

1.1 This practice covers the determination of the total amount of water (free and bound) in raw and lint cotton at moisture equilibrium from conditioning in the standard atmosphere for testing textiles. Note 1: For other methods of determination of moisture in lint cotton that do not specify conditioning to moisture equilibrium, refer to Test Methods D2495 and D1348 . 1.2 This practice requires the use of oven evaporation to remove all of the water in the fiber matrix, volumetric Karl Fischer (KF) titration to determine water content and water regain, and control current potentiometry to detect the end point. 1.3 This practice is not intended for use with potentiometric (zero current) and coulometric Karl Fischer titrators (see Test Methods D1533 , D4377 and E1064 ), nor is this practice intended to be used with methanol extracts of cotton (See Test Methods D1348 ). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. For specific precautionary warnings see 9.1 . 1.6 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 The water content of raw or lint cotton determined by this practice, calculated from the required volume of reagent, may be greater, equal to or less than the moisture content measured by standard oven drying methods. These differences may be of significance in commercial transactions ( 1- 3 ) 4 (see also Appendix X2 ). Water content by this method is not to be considered the same attribute as moisture content. 5.2 Standard test methods using volumetric and coulometric Karl Fischer reagent are two of the most widely used procedures for the determination of water. 5.3 The volumetric method is typically used for the routine determination of water in the mass percent range of concentrations. If samples contain very low levels of water, the coulometric technique should be considered (see Test Methods D1533 , E1064 ). 5.4 This practice for testing the water content of cotton can be used for acceptance testing of commercial shipments of lint cotton, manufacturing control and calibration of fast, indirect sensors to measure water. 5.5 Information on the water content of cotton is desirable since the physical properties of cotton are significantly affected by its water content. Variations in the amount of water present, or its regain, affect the mass and hence the market value of a lot of material. 5.6 The observed volume of Karl Fischer reagent used in this practice to analyze a specimen represents the water in the absence of side reactions in an oven supplied with air ( 3 ). Note 2: Side reactions in cotton that confound the actual weight loss due to water have been demonstrated in two laboratory ovens and a thermogravimetric analysis oven supplied with air ( 3 ). This results in an approximation regarding the actual amount of water in cotton based on mass loss by drying. If the moisture content by oven drying agrees with the water content measured by Karl Fischer titration, the one-to-one correspondence may be coincidental due to the presence of both negative and positive biases in moisture content values.