1.1 本试验方法描述了一种使用染色管长度现场测量低压气体系统气相中乙硫醇的快速简便方法。尽管染色管的长度可用于检测每百万体积0.5至120份的乙硫醇浓度，但该测试方法特别适用于LP气体蒸气中含有5 ppm或更多体积乙硫醇的系统。 注1: 色谱技术可用于更精确、定量地测定液化石油气中的乙硫醇。 1.2 以国际单位制表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.3 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建立适当的安全、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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 液化石油气无色无味，正常人类感官无法检测到。为了在发生泄漏时提供嗅觉警告，有意对家用或商用燃料的低压气体进行加臭处理，以便在空气中的低压气体易燃或令人窒息的浓度水平以下时容易检测到。（参见 附录X1 对于重要的解释。）液化石油气最常见的加臭剂是乙硫醇。该测试方法的现场使用将快速确定低压气体中乙硫醇的存在和浓度 水蒸气 而不需要复杂的实验室设备。

1.1 This test method describes a rapid and simple procedure using length-of-stain tubes for field measurement of ethyl mercaptan in the vapor phase of LP-gas systems. Although length-of-stain tubes are available to detect ethyl mercaptan concentrations in the range of 0.5 to 120 parts per million by volume, this test method is specifically applicable to systems containing 5 ppm by volume or more of ethyl mercaptan in LP-gas vapors. Note 1: A chromatographic technique can be used for more precise, quantitative determination of ethyl mercaptan in LP-gas. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units 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 LP-gas is colorless and odorless, and not detectable by normal human senses. To provide an olfactory warning in the event of a leak, LP-gas intended for domestic or commercial fuel use is intentionally odorized so as to be readily detectable well below flammable or suffocating concentration levels of LP-gas in air. (See Appendix X1 for important explanations.) The most common odorant for LP-gas is ethyl mercaptan. The field use of this test method will rapidly determine the presence and concentration of ethyl mercaptan in LP-gas vapor without the necessity for complex laboratory equipment.