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Fig. 2. The isotopic composition of methane plotted versus the ln of the fraction of methane remaining at a number of time points in closed-system incubations of methane in air over landfill soil. M represents the concentration of methane at time t and Mo represents the concentration at the initial time. Using the slopes of the lines fit to the data from different incubations (represented by the different symbols), the fractionation factor (
) was calculated using Eq. [3], where 1000(1/ - 1) is the slope of the line fit to the data. Solid symbols represent incubations of soil from the Hökhuvud landfill while open symbols represent soil from the Falköping landfill
