1.1 碳酸氢钠涂层玻璃管和膜过滤方法提供了一种分离和收集与碳酸氢钠反应的大气气态氟化物和由过滤器收集的氟化物颗粒形式的方法。该试验方法适用于12小时的采样周期，以15升/分钟（0.5英尺）的速度收集1至500μg的气态氟化物 3. /最小）采样率或约0.1至50μg/m 3. . 因此，可以调整采样周期的长度，使收集的氟化物量在该范围内。测试方法的实际下限取决于所用分析方法的灵敏度以及试管制备和分析中使用的试剂的质量。建议检测下限应考虑为月算术平均空白值标准差的两倍。 任何大于空白值小于该值的值应报告为“空白值” 1.2 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 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 碳酸氢钠涂层管式过滤器法提供了一种分离和收集大气气态氟化物和颗粒氟化物样品的方法。 5.2 由于样品是在干管和过滤器上收集的，因此可以用小体积的洗脱剂洗脱氟化物（见第节） 10 有关氟化物洗脱的具体说明）。洗提至小体积，并且所采用的分析方法的灵敏度允许在12小时内对所采集的样品进行每立方米微克的分析。

1.1 The sodium bicarbonate-coated glass tube and membrane filter method provides a means for the separation and collection of gaseous atmospheric forms of fluoride reactive with sodium bicarbonate and particulate forms of fluoride which are collected by a filter. The test method is applicable to 12-h sampling periods, collecting 1 to 500 μg of gaseous fluoride at a 15 L/min (0.5 ft 3 /min) sampling rate or about 0.1 to 50 μg/m 3 . The length of the sampling period can therefore be adjusted so that the amount of fluoride collected will fall within this range. The actual lower limit of the test method will depend upon the sensitivity of the analytical method employed and the quality of reagents used in tube preparation and analysis. It is recommended that the lower limit of detection should be considered as two times the standard deviation of the monthly arithmetic mean blank value. Any values greater than the blank by less than this amount should be reported as “blank value.” 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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 The sodium bicarbonate coated tube filter method provides a means of separating and collecting atmospheric gaseous fluoride and particulate fluoride samples. 5.2 Since the samples are collected on the dry tube and filter, the fluoride may be eluted with a small volume of eluant (see Section 10 for specific instructions on fluoride elution). Elution into a small volume and the sensitivity of the analytical methods employed allow the analysis of the collected fluoride to fractional parts of a microgram per cubic metre on samples taken for a 12-h period.