1.1 本试验方法用于测量大气中浓度低于十亿分之一百（ppb（v）=195μg/m）的硫醇（有机硫醇） 3. ). 对于高于100 ppb（v）的浓度，可以在抽吸之前或之后缩短取样周期或增加捕集液体积。（参见实践 D1357 用于采样指导。）甲硫醇的最低检出量为0.04μg/mL ( 1. ) 2. 在25 mL的最终液体体积中。当以2 L/min的最大建议速率对空气进行2 h采样时，最小可检测硫醇浓度为1.0 ppb（v）（1.95μg甲基硫醇/m） 3. 在101.3 kPa（760 mm Hg）和25°C下）。本试验方法测定总硫醇，不区分单个硫醇，尽管它对低分子量烷硫醇最敏感。 1.2 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。 1.3 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。 具体预防说明见 8.7 , 8.8 ，和截面 9 . 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 硫醇是一种低浓度的恶臭物质，在较高浓度下有毒。 它们是从地热源、工业加工和食品加工设施排放的。出于安全目的，通常将低浓度硫醇添加到天然气和液化石油气中。

1.1 This test method is for the measurement of mercaptans (organic thiols) in the atmosphere at concentrations below 100 parts per billion (ppb(v) = 195 μg/m 3 ). For concentrations above 100 ppb(v), the sampling period can be reduced or the trapping liquid volume increased either before or after aspirating. (See Practice D1357 for sampling guidance.) The minimum detectable amount of methyl mercaptan is 0.04 μg/mL ( 1 ) 2 in a final liquid volume of 25 mL. When sampling air at the maximum recommended rate of 2 L/min for 2 h, the minimum detectable mercaptan concentration is 1.0 ppb(v) (1.95 μg methyl mercaptan/m 3 at 101.3 kPa (760 mm Hg) and 25°C). This test method determines total mercaptans and does not differentiate among individual mercaptans, although it is most sensitive to the lower molecular weight alkanethiols. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Specific precautionary statements are given in 8.7 , 8.8 , and Section 9 . 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 Mercaptans are odorous substances offensive at low concentrations and toxic at higher levels. They are emitted from geothermal sources, industrial processes, and food processing facilities. Mercaptans at low concentrations are commonly added to natural gas and LP gases for safety purposes as well.