1.1 本试验方法用于硫化氢（H 2. S） 在天然气中使用可调谐二极管激光吸收光谱（TDLAS）分析仪，也称为“TDL分析仪” 2. S测量值因制造商而异，通常在1000到10之间 000nm，单个激光器的可调谐范围小于10 纳米。H 2. S浓度范围可以是0-5  ppm（v）至0-90 % 按体积计算。 1.2 单位- 以国际单位制表示的数值应视为标准。本标准不包括其他测量单位。TDLAS分析仪固有地以无单位摩尔比（例如ppm（v））输出浓度。 注1: 每体积单位的重量，如H的毫克或颗粒 2. S每立方英尺或立方米可以从“标准条件”或标准温度和压力下的ppm（v）导出。 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 H 2. 对天然气中的S进行测量，以确保浓度满足天然气采购合同标准，并防止管道和相关部件腐蚀。 5.2 使用TDLAS测量H 2. 天然气中的S能够在天然气流中的常见成分干扰最小的情况下实现高选择性。与其他方法相比，TDLAS分析仪可以以相对快速的响应检测浓度变化，因此操作员可以在指定H 2. 超过S浓度。 5.3 本测试方法中涵盖的主要应用程序列于 5.3.1 和 5.3.2 每个应用可能具有不同的气体取样要求和方法。此外，不同的天然气应用可能需要独特的光谱考虑。 5.3.1 未经处理的天然气存在于生产、集气站和天然气处理厂的入口，其特点是可能存在高水位（H 2. O） ，二氧化碳（CO 2. )，小时 2. S、 以及重质烃。气体调节装置和撬通常用于去除H 2. O、 CO公司 2. H 2. S、 以及其他污染物。 5.3.2 在运输管道、天然气配送（公用事业）和天然气发电厂入口中发现了高质量的“销售气体”。这种气体的特点是甲烷含量非常高（90至100 %) 含有少量其他碳氢化合物和微量污染物。

1.1 This test method is for the online determination of hydrogen sulfide (H 2 S) in natural gas using tunable diode laser absorption spectroscopy (TDLAS) analyzers also known as a “TDL analyzers.” The particular wavelength for H 2 S measurement varies by manufacturer, typically between 1000 and 10 000 nm with an individual laser having a tunable range of less than 10 nm. The H 2 S concentration ranges can be anywhere from 0-5  ppm(v) to 0-90 % by volume. 1.2 Units— The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. TDLAS analyzers inherently output concentrations in unitless molar ratios such as ppm(v). Note 1: Weight-per-volume units such as milligrams or grains of H 2 S per cubic foot or cubic meter can be derived from ppm(v) at “standard conditions” or standard temperature and pressure. 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 H 2 S measurements in natural gas are performed to ensure concentrations satisfy gas purchase contract criteria and to prevent pipeline and associated component corrosion. 5.2 Using TDLAS for the measurement of H 2 S in natural gas enables a high degree of selectivity with minimal interference from common constituents in natural gas streams. The TDLAS analyzer can detect changes in concentration with a relatively rapid response compared to other methods so that operators may take swift action when designated H 2 S concentrations are exceeded. 5.3 Primary applications covered in this test method are listed in 5.3.1 and 5.3.2 . Each application may have differing requirements and methods for gas sampling. Additionally, different natural gas applications may require unique spectroscopic considerations. 5.3.1 Raw natural gas is found in production, gathering sites, and inlets to gas-processing plants characterized by potentially high levels of water (H 2 O), carbon dioxide (CO 2 ), H 2 S, and heavy hydrocarbons. Gas-conditioning plants and skids are normally used to remove H 2 O, CO 2 , H 2 S, and other contaminants. 5.3.2 High-quality “sales gas” is found in transportation pipelines, natural gas distribution (utilities), and natural gas power plant inlets. The gas is characterized by a very high percentage of methane (90 to 100 %) with small quantities of other hydrocarbons and trace levels of contaminants.