1.1 本试验方法用于通过气相色谱（GC）和电化学（EC）检测在线测量气体燃料中的气相含硫化合物。本试验方法适用于硫化氢、C1至C4硫醇、硫化物和四氢噻吩（THT）。 1.1.1 羰基硫（COS）未按照本试验方法进行测量。 1.1.2 含硫化合物的检测范围约为0.1至100 ppm（v）（mL/m 3. )或0.1至100 mg/m 3. 在25 摄氏度，101.3 千帕。检测范围将根据样品注入量、色谱峰分离和特定EC检测器的灵敏度而变化。 1.2 本试验方法描述了一种使用毛细管气相色谱柱和特定检测器的气相色谱-电子色谱法，用于天然气和其他主要由轻质（C4及更小）碳氢化合物组成的气体燃料。 可以使用替代GC柱，包括填充柱、检测器设计和仪器参数，前提是实现了满足用户或监管机构需求所需的色谱分离、质量控制和测量目标，或两者兼有。 1.3 本试验方法不打算识别和测量所有单个硫物种，主要用于监测天然气和燃料气中常见的天然存在的还原硫化合物，或用作这些气体中的加臭剂。 1.4 该测试方法通常用于使用单一硫校准标准对天然气和燃料气中的硫成分进行重复或连续在线监测。可在《测试方法》中找到针对特定分析物或增强质量控制程序生成校准曲线的指南 第5504天 , D5623型 , 第6228页 , 第6968页 、ISO 19739或GPA 2199。 1.5 该测试方法可用于测量中列出的含硫化合物 表1 在空气或其他气体基质中，条件是不存在可能干扰GC分离和电化学检测的化合物。 1.6 此测试方法是作为实践的配套编写的 天5287 , 第7165页 和 第7166页 . 1.7 单位- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.8 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 天然气、石油气和生物气体等气体燃料含有天然存在的含硫化合物，或出于安全目的作为加臭剂添加的含硫化合物。这些含硫化合物有气味、有毒、对设备有腐蚀性，并可抑制或破坏气体处理和其他最终用途中使用的催化剂。它们的精确连续测量对气体处理、操作和使用很重要，并且经常引起监管部门的关注。 5.2 少量（通常为4至6 ppm（v））的硫加臭剂添加到天然气和其他燃料气体中以达到安全目的。一些硫加臭剂是反应性的，可以被氧化以形成更稳定的含硫化合物，其具有更高的气味阈值，这对气体输送系统和气体用户的潜在安全产生不利影响。 分析气体燃料的含硫化合物和气味水平，以协助管道完整性监测，并确保适当的气味水平，确保公共安全。 5.3 该方法提供了一种在线方法，通过自动校准和验证，连续识别和量化气体燃料中的单个目标硫物种。

1.1 This test method is for on-line measurement of gas phase sulfur-containing compounds in gaseous fuels by gas chromatography (GC) and electrochemical (EC) detection. This test method is applicable to hydrogen sulfide, C1 to C4 mercaptans, sulfides, and tetrahydrothiophene (THT). 1.1.1 Carbonyl sulfide (COS) is not measured according to this test method. 1.1.2 The detection range for sulfur compounds is approximately from 0.1 to 100 ppm(v) (mL/m 3 ) or 0.1 to 100 mg/m 3 at 25 °C, 101.3 kPa. The detection range will vary depending on the sample injection volume, chromatographic peak separation, and the sensitivity of the specific EC detector. 1.2 This test method describes a GC-EC method using capillary GC columns and a specific detector for natural gas and other gaseous fuels composed of mainly light (C4 and smaller) hydrocarbons. Alternative GC columns including packed columns, detector designs, and instrument parameters may be used, provided that chromatographic separation, quality control, and measurement objectives needed to comply with user or regulator needs, or both, are achieved. 1.3 This test method does not intend to identify and measure all individual sulfur species and is mainly employed for monitoring naturally occurring reduced sulfur compounds commonly found in natural gas and fuel gases or employed as an odorant in these gases. 1.4 This test method is typically employed in repetitive or continuous on-line monitoring of sulfur components in natural gas and fuel gases using a single sulfur calibration standard. Guidance for producing calibration curves specific to particular analytes or enhanced quality control procedures can be found in Test Methods D5504 , D5623 , D6228 , D6968 , ISO 19739, or GPA 2199. 1.5 The test method can be used for measuring sulfur compounds listed in Table 1 in air or other gaseous matrices, provided that compounds that can interfere with the GC separation and electrochemical detection are not present. 1.6 This test method is written as a companion to Practices D5287 , D7165 and D7166 . 1.7 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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. 1.9 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 Gaseous fuels, such as natural gas, petroleum gases and bio-gases, contain sulfur compounds that are naturally occurring or that are added as odorants for safety purposes. These sulfur compounds are odorous, toxic, corrosive to equipment, and can inhibit or destroy catalysts employed in gas processing and other end uses. Their accurate continuous measurement is important to gas processing, operation and use, and is frequently of regulatory interest. 5.2 Small amounts (typically, total of 4 to 6 ppm(v)) of sulfur odorants are added to natural gas and other fuel gases for safety purposes. Some sulfur odorants are reactive and may be oxidized to form more stable sulfur compounds having higher odor thresholds which adversely impact the potential safety of the gas delivery systems and gas users. Gaseous fuels are analyzed for sulfur compounds and odorant levels to assist in pipeline integrity surveillance and to ensure appropriate odorant levels for public safety. 5.3 This method offers an on-line method to continuously identify and quantify individual target sulfur species in gaseous fuel with automatic calibration and validation.