Figure 4
From: Characterization of humic acids from original coal and its oxidization production
13C NMR spectraof HAs. HA1–HA5, the HAs extracted from original coal; OHA1–OHA5, the HAs extracted from oxidized coal.
Figure 4 | Scientific Reports
From: Characterization of humic acids from original coal and its oxidization production
13C NMR spectraof HAs. HA1–HA5, the HAs extracted from original coal; OHA1–OHA5, the HAs extracted from oxidized coal.
