1.1 本试验方法涵盖硫化氢（H）的现场测定 2. S） 在残余燃油样品的气相（平衡顶空）中。 1.2 本试验方法适用于粘度范围为5.5 mm的液体 2. /s在40 °C至50 mm 2. /s在100 °C.试验方法适用于符合规范的燃料 D396页 4、5（重型）和6级。 1.3 适用范围为5 μmol/mol至4000 μmol/mol（微摩尔/摩尔）（5 ppm v/v至4000 ppm v/v（百万分之一体积））。 1.4 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.5 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。 1.6 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 残余燃油可能含有H 2. 这可能会导致危险的气相H水平 2. 在储罐顶部空间中。气相水平可根据顶空体积、燃料温度和搅拌而显著变化。H的测量 2. 液相中的S水平提供了一个有用的指示，表明残余燃料油形成高汽相水平的倾向，而残余燃料油中的较低水平将直接降低H的风险 2. S暴露。然而，至关重要的是，参与处理燃油的任何人，如船舶所有人和操作员，应继续保持适当的安全做法，以保护船员、罐区操作员和其他可能接触H 2. S 5.1.1 H的测量 2. 液相S适合于产品质量控制，而H的测量 2. 出于健康和安全目的，气相中的S是合适的。 5.2 该测试方法旨在为炼油厂、燃料码头和独立测试实验室提供一种简单且一致的现场测试方法，用于快速测定H 2. 残留燃油上方的气相中的S。 注1: D5705 是定量测量H的三种测试方法之一 2. 残余燃料中的硫: 1） 试验方法 D6021 是一种测定H的分析测试方法 2. S液相液位。 2） 试验方法 D7621 是一种快速测定H的测试方法 2. S液相液位。 注2: 由于H的反应性、吸收率和挥发性 2. S、 任何测量方法仅提供H 2. S在给定时刻的浓度。 5.3 本试验方法不一定模拟气相H 2. S在燃料储罐中的浓度。然而，它确实提供了一致性水平，因此测试结果仅是残余燃油样本的函数，而不是测试方法、操作员或位置。现场测试与H的实际气相浓度之间无法建立一般相关性 2. 在剩余燃油储存或运输中。然而，在基本恒定的条件下从同一原油来源生产燃料油的设施可能能够为其个别情况建立相关性。

1.1 This test method covers the field determination of hydrogen sulfide (H 2 S) in the vapor phase (equilibrium headspace) of a residual fuel oil sample. 1.2 The test method is applicable to liquids with a viscosity range of 5.5 mm 2 /s at 40 °C to 50 mm 2 /s at 100 °C. The test method is applicable to fuels conforming to Specification D396 Grade Nos. 4, 5 (Heavy), and 6. 1.3 The applicable range is from 5 μmol/mol to 4000 μmol/mol (micromoles per mole) (5 ppm v/v to 4000 ppm v/v (parts per million by volume)). 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 Residual fuel oils can contain H 2 S in the liquid phase and this can result in hazardous vapor phase levels of H 2 S in storage tank headspaces. The vapor phase levels can vary significantly according to the headspace volume, fuel temperature and agitation. Measurement of H 2 S levels in the liquid phase provides a useful indication of the residual fuel oil’s propensity to form high vapor phase levels, and lower levels in the residual fuel oil will directly reduce risk of H 2 S exposure. It is critical, however, that anyone involved in handling fuel oil, such as vessel owners and operators, continue to maintain appropriate safety practices designed to protect the crew, tank farm operators and others who can be exposed to H 2 S. 5.1.1 The measurement of H 2 S in the liquid phase is appropriate for product quality control, while the measurement of H 2 S in the vapor phase is appropriate for health and safety purposes. 5.2 This test method was developed to provide refineries, fuel terminals and independent testing laboratories, which do not have access to analytical instruments such as a gas chromatograph, with a simple and consistent field test method for the rapid determination of H 2 S in the vapor phase above residual fuel oils. Note 1: D5705 is one of three test methods for quantitatively measuring H 2 S in residual fuels: 1) Test Method D6021 is an analytical test method to determine H 2 S levels in the liquid phase. 2) Test Method D7621 is a rapid test method to determine H 2 S levels in the liquid phase. Note 2: Because of the reactivity, absorptivity and volatility of H 2 S, any measurement method only provides an H 2 S concentration at a given moment in time. 5.3 This test method does not necessarily simulate the vapor phase H 2 S concentration in a fuel storage tank. It does, however, provide a level of consistency so that the test result is only a function of the residual fuel oil sample and not the test method, operator, or location. No general correlation can be established between this field test and actual vapor phase concentrations of H 2 S in residual fuel oil storage or transports. However, a facility that produces fuel oil from the same crude source under essentially constant conditions might be able to develop a correlation for its individual case.