What changes the isotopic ratio?
As we described above, changes in isotopic ratio are caused by the breaking of bonds. Dilution, diffusion and volatilization don’t measurably change the isotopic ratio of VOC’s in ground water. For an isotopic ratio to measurably change, a bond must be broken. For VOC’s in ground water, that means degradation of a compound is the only significant cause of increasing dels for that compound.
