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This study concerns the development of an ion chromatography (IC) method for quantitative trace analysis of ammonium in 0.1\u2009M sulfuric acid electrolyte, which is applied to EAS gas\u2010diffusion electrode (GDE) experiments with commercial chromium nitride as electrocatalyst. The developed IC method is highly sensitive, versatile, and reliable, achieving a limit of quantification (LOQ) of 6\u2005\u03bcg\u2009l<jats:sup>\u22121<\/jats:sup> (6\u2005ppb<jats:sub>mol<\/jats:sub>) ammonium. The impacts of the sample matrix, dilution, and neutralization, as well as contamination, on the quantitative analysis by IC are analyzed. Experimental constraints result in an effective LOQ including dilution of 60\u2005\u03bcg\u2009l<jats:sup>\u22121<\/jats:sup> for the determination of ammonium in 0.1\u2009M sulfuric acid electrolyte, owing to necessary sample dilution. The practical guide presented herein is intended to be very relevant for the field of EAS as a guideline and applicable to a broad range of catalyst systems and ion chromatography devices.<\/jats:p>","DOI":"10.1002\/cssc.202202211","type":"journal-article","created":{"date-parts":[[2023,3,17]],"date-time":"2023-03-17T09:10:08Z","timestamp":1679044208000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Application of Ion Chromatography for the Reliable Quantification of Ammonium in Electrochemical Ammonia Synthesis Experiments: A Practical Guide"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3082-2174","authenticated-orcid":false,"given":"Sebastian C. 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