1.1 本试验方法涵盖了天然气管道中硫醇的快速简单现场测定。可用的检测管提供了硫醇体积为0.5至160 ppm的总测量范围，尽管大多数应用将处于该范围的低端（即低于20 ppm）。除总硫醇外，还可使用检测管检测甲基硫醇（0.5至100 ppm）、乙基硫醇（0.5至120 ppm）和丁硫醇（0.5至30 mg/M） 3. 或0.1至8 ppm）。 注1: 某些检测管以毫克每立方米（mg/M）为单位进行校准 3. )而不是百万分之一的体积。25的转换如下 摄氏度（77 °F）和760毫米汞柱。 1.2 探测器管通常会受到目标物质以外的气体和蒸汽的干扰。由于使用不同的检测原理，这些干扰可能因品牌而异。许多检测管将有一个预清洁层，用于将干扰消除到某个最大水平。有关具体干扰信息，请参阅制造商的说明。硫化氢和其他硫醇通常会干扰硫醇检测管。 参见第节 6. 各种检测方法的干扰。 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。 有关具体的危险说明，请参阅 8.3 . 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 天然气中硫醇的测量很重要，因为硫醇通常作为加臭剂添加到天然气中，以提供警告特性。硫醇提供的气味用于警告消费者（例如，住宅使用）天然气泄漏水平远低于空气中易燃或令人窒息的天然气浓度水平。天然气中硫醇的现场测定很重要，因为硫醇浓度随时间呈下降趋势。 5.2 该试验方法提供了廉价的硫醇现场筛选。系统设计为非技术人员可以使用，只需最少的培训。

1.1 This test method covers a rapid and simple field determination of mercaptans in natural gas pipelines. Available detector tubes provide a total measuring range of 0.5 to 160 ppm by volume of mercaptans, although the majority of applications will be on the lower end of this range (that is, under 20 ppm). Besides total mercaptans, detector tubes are also available for methyl mercaptan (0.5 to 100 ppm), ethyl mercaptan (0.5 to 120 ppm), and butyl mercaptan (0.5 to 30 mg/M 3 or 0.1 to 8 ppm). Note 1: Certain detector tubes are calibrated in terms of milligrams per cubic metre (mg/M 3 ) instead of parts per million by volume. The conversion is as follows for 25 °C (77 °F) and 760 mm Hg. 1.2 Detector tubes are usually subject to interferences from gases and vapors other than the target substance. Such interferences may vary among brands because of the use of different detection principles. Many detector tubes will have a precleanse layer designed to remove interferences up to some maximum level. Consult manufacturer's instructions for specific interference information. Hydrogen sulfide and other mercaptans are usually interferences on mercaptan detector tubes. See Section 6 for interferences of various methods of detection. 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. For specific hazard statements, see 8.3 . 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 measurement of mercaptans in natural gas is important, because mercaptans are often added as odorants to natural gas to provide a warning property. The odor provided by the mercaptan serves to warn consumers (for example, residential use) of natural gas leaks at levels that are well below the flammable or suffocating concentration levels of natural gas in air. Field determinations of mercaptans in natural gas are important because of the tendency of the mercaptan concentration to decline over time. 5.2 This test method provides inexpensive field screening of mercaptans. The system design is such that it may be used by nontechnical personnel, with a minimum of training.