1.1 本试验方法涵盖硫化氢（H）的自动连续测定 2. S） 在大气中或气体样品中，范围为十亿分之一体积（1 ppb/v）到3000 ppb/v。获得的信息可用于空气污染研究、栅栏线监测和其他源排放监测。 1.2 可通过适当的稀释技术或设备改造来扩大范围。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.4 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。 （参见第节 9 具体的安全预防说明。） 1.5 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 硫化氢是一种气味物质，即使在大气中浓度较低时也令人厌恶，在较高浓度时有毒。它可能是缺氧条件下生物过程的产物，如在城市垃圾填埋场中可能发生的情况。它是从地热源排放的，存在于石油和天然气中，可能是从工业过程中排放的。空气污染研究、污染控制、基于环境正义的监测和羽流表征都需要测量。本试验方法适用于硫化氢含量高达3000 ppbv的情况。测试方法中描述了气体燃料、二氧化碳或其他气体基质中高于该浓度的硫化氢的测量 D4084 .所述设备适用于固定现场或移动监测。

1.1 This test method covers the automatic continuous determination of hydrogen sulfide (H 2 S) in the atmosphere or in gaseous samples in the range from one part per billion by volume (1 ppb/v) to 3000 ppb/v. Information obtained may be used for air-pollution studies, fence-line monitoring, and other source emission monitoring. 1.2 The range may be extended by appropriate dilution techniques or by equipment modification. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.4 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. (See Section 9 for specific safety precautionary statements.) 1.5 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 Hydrogen sulfide is an odorous substance which is offensive even at low concentrations in the atmosphere and toxic at higher levels. It may be a product of biological processes in the absence of oxygen, as may occur in municipal landfills. It is emitted from geothermal sources, occurs in oil and gas, and may be emitted from industrial processes. Measurement is required for air pollution studies, for pollution control, environmental justice based monitoring, and for plume characterization. This test method is intended for hydrogen sulfide content up to 3000 ppbv. Measurement of hydrogen sulfide above this concentration in gaseous fuels, carbon dioxide or other gaseous matrices is described in Test Method D4084 . Equipment described is suitable for fixed site or for mobile monitoring.