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Effect of ɛac-methyl on quantification of the fraction of CH4 originating from H2-CO2 (fmc). (A) Production of CH4 (⧫) and isotope ratios of the newly formed CH4 (○) and of the CO2 (□) during incubation of Lake Dagow sediment (obtained in 2005). The values are means ± standard errors (n = 3). (B) fmc calculated using different enrichment factors (ɛac-methyl) (an ɛac-methyl of −14.2‰ is the value determined in this study for Lake Dagow sediment).
