Figure 2.

A comparison of the methane (CH4) and sulfate (SO42-) concentrations of individual wells in the Mahomet aquifer. The amount of sulfate in HS wells is > 0.2 mM, is between 0.03 and 0.2 mM in LS wells, and is less than 0.03 mM in NS wells.

Flynn et al. BMC Microbiology 2013 13:146   doi:10.1186/1471-2180-13-146
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