At the highest metrological level, biogas standards are commonly prepared gravimetrically as PSMs (primary standard mixtures). This international key comparison addresses the composition of biogas, to support calibration and measurement services for this renewable energy gas. The mixtures contain nitrogen, carbon dioxide, methane, ethane, propane, hydrogen and oxygen and represent the composition of biogas from landfills. The results in this Track C key comparison on the composition of biogas are generally good. Some of the datasets, especially that of oxygen, showed substantial extra dispersion, that could not be explained by the stated uncertainties.Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.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).

中文翻译：

---

国际比较 CCQM-K112 沼气

在最高计量水平上，沼气标准品通常以重量分析法制备为 PSM（主要标准混合物）。这项国际重点比较涉及沼气的成分，以支持这种可再生能源气体的校准和测量服务。这些混合物包含氮气、二氧化碳、甲烷、乙烷、丙烷、氢气和氧气，代表垃圾填埋场沼气的成分。本次Track C重点比较沼气成分的结果总体良好。一些数据集，尤其是氧气数据集，显示出大量额外的分散，无法用所述的不确定性来解释。正文 要访问本文的正文，请单击最终报告。请注意，此文本出现在 BIPM 密钥比较数据库 kcdb.bipm.org/ 的附录 B 中。