1.1 这些试验方法 2. 涵盖水中氟离子的测定。给出了以下两种试验方法: 小节 试验方法A-蒸馏 7. 到 13 试验方法B-离子选择电极 14 到 21 1.2 试验方法A包括通过蒸馏分离氟化物，并随后使用离子选择电极（ISE）方法测量蒸馏液中的氟化物，从而准确测量水中的总氟化物。该程序涵盖0.1至2.6 mg/L的氟化物。 1.3 试验方法B包括通过离子选择电极准确测量水中的简单氟离子。通过该试验方法，消除了蒸馏，因为电极不受比色程序常见干扰的影响。可测量0.1至1000 mg/L的氟化物浓度。 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。 有关具体的预防说明，请参阅 12.1.2 . 1.6 以前的试验方法A，SPADNS光度测定程序，已停止。提到 附录X1 以获取历史信息。 1.7 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 天然水中存在简单和复杂的氟离子。氟化物与硅、铝和硼形成络合离子。 这些络合物可能源于工业使用氟化合物。 4.2 在这个国家，大量社区采用饮用水氟化来预防龋齿。监测氟化物以确保维持最佳处理水平，通常接近1 mg/L。

1.1 These test methods 2 cover the determination of fluoride ion in water. The following two test methods are given: Sections Test Method A—Distillation 7 to 13 Test Method B—Ion Selective Electrode 14 to 21 1.2 Test Method A covers the accurate measurement of total fluoride in water through isolation of the fluoride by distillation and subsequent measurement in the distillate by use of the ion selective electrode (ISE) method. The procedure covers the range from 0.1 to 2.6 mg/L of fluoride. 1.3 Test Method B covers the accurate measurement of simple fluoride ion in water by means of an ion selective electrode. With this test method, distillation is eliminated because the electrode is not affected by the interferences common to colorimetric procedures. Concentrations of fluoride from 0.1 to 1000 mg/L may be measured. 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 a specific precautionary statement, see 12.1.2 . 1.6 Former Test Method A, SPADNS Photometric Procedure, was discontinued. Refer to Appendix X1 for historical information. 1.7 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 Simple and complex fluoride ions are found in natural waters. Fluoride forms complexing ions with silicon, aluminum, and boron. These complexes may originate from the use of fluorine compounds by industry. 4.2 Fluoridation of drinking water to prevent dental caries is practiced by a large number of communities in this country. Fluoride is monitored to assure that an optimum treatment level, usually near 1 mg/L, is maintained.