Processes

Enrichment factors (e)

Reference cites

Acetate fermentation pathway

e = 40‰ - 50‰

[11]

CO₂ reduction pathway

e = 55‰ - 90‰

[11]

CH₄ oxidation

e = 3‰ - 31‰

e = 22‰

[54]

[55]

Diffusion CH₄ across

e = 20‰ (cover soil)

e = 18‰ (cover soil)

e = 2‰ - 3‰ (interface water-air)

[56]

[49]

[57]

Ebullition

No fractionation

[53]