Accurate measurements for the determination of hydrogen sulfide (H₂S) are critical for the compliance with legislation in various industries, including natural gas and environmental sectors such as air pollution monitoring. H₂S measurements at ambient level are challenging because H₂S tends to adsorb on the internal surfaces of the sample collection devices such as gas cylinders and transfer lines. Prolonged exposure to H₂S has known health implications to humans, such as irritation to the nose, throat and airways that results in coughing or inflammation, wheezing and shortness of breath around the chest. H₂S is mainly monitored for occupational health and safety and indoor air quality monitoring. It is a highly reactive gas that can easily react with oxygen to form sulfur dioxide (SO₂) and with water to form sulfuric acid (H₂SO₄). The traceability of H₂S measurements is achieved through the preparation of reference gas mixtures. These gas mixtures are gravimetrically prepared in accordance with International Organization for Standardization (ISO 6142–1:2015). The H₂S reference gas mixtures were produced with the highest metrological capability; thus, the molar mass, purity assessment, and the weighing gave an overall gravimetric relative uncertainty which is less than 0.10% (k = 1). One of the biggest challenges in producing a H₂S reference gas mixture is the handling of a gas cylinder from the gravimetric preparation process until the verification stage. This work will detail the improved techniques and measurements used to produce the H₂S reference gas mixtures. The internal consistency between the mixtures was verified using a non-dispersive ultraviolet (NDUV) spectroscopy analyzer, an ultraviolet fluorescence spectroscopy (UVFS) analyzer and gas chromatography coupled with a pulsed discharged helium ionization detector (GC-PDHID). Our measurement uncertainty results show that the gravimetric value, internal consistency, adsorption, homogeneity, and stability were within a relative uncertainty of 1.2% as compared to our previous uncertainty of 4.4%. This is a significant improvement for the measurements of H₂S reference gas mixtures.

准确测定硫化氢（H ₂ S）的含量对于遵守各种行业的法规至关重要，这些行业包括天然气和环境部门，例如空气污染监测。在环境水平下进行H ₂ S测量具有挑战性，因为H ₂ S倾向于吸附在样品收集装置（例如气瓶和传输线）的内表面上。长期接触H ₂ S已对人类健康产生影响，例如对鼻子，喉咙和气道的刺激会导致咳嗽或发炎，喘鸣和胸口气短。高₂S主要用于职业健康和安全以及室内空气质量监测。它是一种高反应性气体，很容易与氧气反应形成二氧化硫（SO ₂），与水反应形成硫酸（H ₂ SO ₄）。H ₂ S测量的可追溯性是通过制备参考气体混合物来实现的。这些气体混合物是根据国际标准化组织（ISO 6142-1：2015）重量分析制备的。生产的H ₂ S参考气体混合物具有最高的计量能力；因此，摩尔质量，纯度评估和称量得出的总重量相对不确定度小于0.10％（k = 1）。生产H ₂ S参考气体混合物的最大挑战之一是从重量法制备过程到验证阶段的气瓶处理。这项工作将详细介绍用于生产H ₂的改进技术和测量方法S参考气体混合物。使用非分散紫外（NDUV）光谱分析仪，紫外荧光光谱（UVFS）分析仪和气相色谱仪结合脉冲放电氦离子化检测器（GC-PDHID）验证了混合物之间的内部一致性。我们的测量不确定度结果表明，重量值，内部稠度，吸附，均质性和稳定性均在1.2％的相对不确定度内，而之前的不确定度为4.4％。对于H ₂ S参考气体混合物的测量而言，这是一个重大的改进。