Fig. 2. Graph of region areas versus contact time for Cedar Creek humic acid (HA), obtained using (A) cross polarization magic angle spinning (CPMAS) and (B) ramp CPMAS. See Table 1 for region assignments.
Fig. 2. Graph of region areas versus contact time for Cedar Creek humic acid (HA), obtained using (A) cross polarization magic angle spinning (CPMAS) and (B) ramp CPMAS. See Table 1 for region assignments.