Abstract

Hydrogen consumption was measured in hot geothermal water from two ponds of the San Federigo solfatara, Tuscany, Italy, where emanation gases contained approx. 4% H2. H2 consumption was completely inhibited by NaOH and partially by HgCl2 indicating microbial utilization. Aerobic and anaerobic H2 consumption activities coexisted in the same water with aerobic activity being higher in one pond and anaerobic activity in the other. The kinetics of H2 consumption were consistent with those of ‘Knallgas’, methanogenic or sulfidogenic bacteria.

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