Fig. 5. Changes of H/C and O/C atomic ratios as a function of the peak area of the small-size humic acid (HA) subunit for the eight HA fractions. Symbols represent data points and lines are the best fits using linear regressions.
Fig. 5. Changes of H/C and O/C atomic ratios as a function of the peak area of the small-size humic acid (HA) subunit for the eight HA fractions. Symbols represent data points and lines are the best fits using linear regressions.