Fig. 6: Number of co-molecular characteristics of derived DOM from Fenton degradation of different DOM species in the gradient mixed monomer reactions versus individual monomer reactions.

a The co-molecular characteristics of Fenton-derived DOM in the gradient mixed monomer reactions versus individual monomer reactions. b The co-molecular characteristics of stable isotope-containing Fenton-derived DOM (δ13C and δD) in the gradient mixed monomer reactions versus individual monomer reactions. In order to visualize the differences, nonequally-spaced time points in the horizontal coordinate were presented in equal proportions. The vertical axis in all panels represents absolute number.