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(A,B) SEM images of a CaCO3/SOM mix deposited on a silica substrate with SOM from S. pistillata or O. patagonica, respectively. In the inset, the EDX spectra recorded from the square regions drawn on the SEM images are reported. (C,D) GID images from CaCO3/SOM mix deposited on silica substrate with SOM from S. pistillata or O. patagonica, respectively.
