Fig. 7. Changes of aromaticity 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 solid lines are the best fits using linear regressions.
Fig. 7. Changes of aromaticity 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 solid lines are the best fits using linear regressions.