1.1 这些试验方法包括使用容量法（试验方法a）或自动库仑滴定仪程序（试验方法B）测定新的或未使用的乙二醇基冷却液浓缩液中的水。 1.2 许多羰基化合物与费歇尔试剂反应缓慢，导致终点褪色，结果较高。包括改进的费歇尔试剂程序，以最小化这些不良反应和干扰反应。 1.3 以国际单位表示的数值视为标准值。 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问题（如有）。本标准的使用者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。 具体危险说明见章节 8. 和 16 . 1.5 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 通过卡尔费休滴定法测定的发动机冷却液浓缩液中的总表观水包括以下各项:( 1. )原始乙二醇基中存在的水；( 2. )添加的水（例如抑制剂溶液）；( 3. )抑制剂水合水（例如Na 2. B 4. O型 7. ·5小时 2. O） ；( 4. )硼酸盐与乙二醇化学反应生成水，生成硼二醇冷凝液和水；和( 5. )试剂与四硼酸盐或氢氧化钠等抑制剂反应产生的定量干扰。

1.1 These test methods cover the determination of the water present in new or unused glycol-based coolant concentrates using a volumetric (Test Method A) or an automatic coulometric titrator procedure (Test Method B). 1.2 Many carbonyl compounds react slowly with the Fischer reagent, causing a fading end point and leading to high results. A modified Fischer reagent procedure is included that minimizes these undesirable and interfering reactions. 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 problems, 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 hazards statements see Sections 8 and 16 . 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 ====== 5.1 The total apparent water in engine coolant concentrate as determined by Karl Fischer titrations consists of the following: ( 1 ) water present in the original glycol base; ( 2 ) water added (for example, inhibitor solutions); ( 3 ) water of hydration of inhibitors (for example, Na 2 B 4 O 7 ·5H 2 O); ( 4 ) water formed in the chemical reaction between borate and ethylene glycol, producing boratediol condensate and water; and ( 5 ) quantitative interference by the reaction of the reagent with inhibitors such as tetraborate or sodium hydroxide.