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Today, a major issue is the presence of impurities such as hydrogen sulfide (H\n                    <jats:sub>2<\/jats:sub>\n                    S) in CO\n                    <jats:sub>2<\/jats:sub>\n                    containing gases, as they are known to inhibit acetogenesis in CO\n                    <jats:sub>2<\/jats:sub>\n                    \u2010based fermentations. However, exact values of toxicity and inhibition are not well\u2010defined. To tackle this uncertainty, a series of toxicity experiments were conducted, with a mixed homoacetogenic culture, total dissolved sulfide concentrations ([TDS]) varied between 0 and 5\u00a0mM and pH between 5 and 7. The extent of inhibition was evaluated based on acetate production rates and microbial growth. Maximum acetate production rates of 0.12, 0.09 and 0.04\u00a0mM\u00a0h\n                    <jats:sup>\u20101<\/jats:sup>\n                    were achieved in the controls without sulfide at pH 7, pH 6 and pH 5. The half\u2010maximal inhibitory concentration (IC\n                    <jats:sub>50<\/jats:sub>\n                    <jats:sup>qAc<\/jats:sup>\n                    ) was 0.86, 1.16 and 1.36\u00a0mM [TDS] for pH 7, pH 6 and pH 5. At [TDS] above 3.33\u00a0mM, acetate production and microbial growth were completely inhibited at all pHs. 16S rRNA gene amplicon sequencing revealed major community composition transitions that could be attributed to both pH and [TDS]. Based on the observed toxicity levels, treatment approaches for incoming industrial CO\n                    <jats:sub>2<\/jats:sub>\n                    streams can be determined.\n                  <\/jats:p>","DOI":"10.1111\/1751-7915.13546","type":"journal-article","created":{"date-parts":[[2020,3,3]],"date-time":"2020-03-03T15:40:15Z","timestamp":1583250015000},"page":"1026-1038","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Homoacetogenesis and microbial community composition are shaped by pH and total sulfide concentration"],"prefix":"10.1111","volume":"13","author":[{"given":"Eleftheria","family":"Ntagia","sequence":"first","affiliation":[{"name":"Center for Microbial Ecology and Technology (CMET) Ghent University Coupure Links 653 Ghent 9000 Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ioanna","family":"Chatzigiannidou","sequence":"additional","affiliation":[{"name":"Center for Microbial Ecology and Technology (CMET) Ghent University Coupure Links 653 Ghent 9000 Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam J.","family":"Williamson","sequence":"additional","affiliation":[{"name":"Center for Microbial Ecology and Technology (CMET) Ghent University Coupure Links 653 Ghent 9000 Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan B. 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