Fig. 5
From: In situ polymerization of soil organic matter by oxidative biomimetic catalysis
Percent of extraction yields of HA and FA from either 40 or 200 g of soil before and after oxidative treatment catalyzed by Fe-Pha: 1 HA HA extracted from 40 g of soil, 1 FA FA extracted from 40 g of soil, 2 HA HA extracted from 200 g of soil, 2 FA FA extracted from 200 g of soil. Error bars indicate standard error (n = 3), and different letters indicate significant differences at P ≤ 0.05 level