The FTIR spectra of composited leachate samples did not change
over successive storms for both composts (Fig. S2, supporting information).
The spectra indicate the presence of different functional groups,
mainly\OH containing groups such as water molecules, phenols, alcohols,
and carboxylic acids, alkenes and S\O or alkyne groups. This correlates
well with the groups identified in the compost NMR and FTIR
described above. And, as was the case for the compost characterization,
no difference in chemical structure of the leachate was detected between
the two composts. More details on interpretation of the FTIR
spectra are given in the supporting information.