Hydrogen sulfide (H₂S) is a poisonous gas which can paralyze the respiratory system, quickly leading to death. It is also a flammable gas, which will ignite explosively when exposed to heat, open flames or oxidizers. For these reasons, hydrogen sulfide is classified as a hazardous material. This comparison is a repeat of the key comparison of the "CCQM-K41 (2005)" and it is intended to compare the capabilities of the preparation and value assignment of gas standard of hydrogen sulfide in nitrogen. The range of the nominal amount-of-substance fractions of the comparison standard is 10 mol/mol. A set of hydrogen sulfide in nitrogen gas mixtures were prepared by gravimetry and verified with gas chromatography-atomic emission detector (GC-AED) against a KRISS reference cylinder. The gravimetric values of the amount of substance fractions were adopted as key comparison reference values (KCRVs). The results of 9 participants are consistent with their KCRV. Therefore, it is possible for this key comparison to offer a good traceability and a harmonization among the global distribution data of H₂S.

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The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

硫化氢（H ₂S) 是一种有毒气体，可以麻痹呼吸系统，迅速导致死亡。它也是一种易燃气体，遇热、明火或氧化剂会发生爆炸性燃烧。由于这些原因，硫化氢被归类为危险材料。本次比较是对《CCQM-K41（2005）》重点比较的重复，旨在比较氮气中硫化氢气体标准品的制备和赋值能力。比较标准品的标称物质含量范围为 10 mol/mol。通过重量法制备了一组氮气混合物中的硫化氢，并使用气相色谱-原子发射检测器 (GC-AED) 对 KRISS 参考钢瓶进行了验证。采用物质馏分量的重量值作为关键比较参考值（KCRVs）。9 名参与者的结果与他们的 KCRV 一致。因此，这一关键比较有可能在 H 的全球分布数据之间提供良好的可追溯性和协调性。₂秒。

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根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCQM 批准发布。