Impact of Redox Condition on Fractionation and Bioaccessibility of Arsenic in Arsenic-Contaminated Soils Remediated by Iron Amendments: A Long-Term Experiment

Table 1

Physicochemical properties of the experimental soil.

pH	7.67
Organic matter (g/kg)	28.7
Total Fe (g/kg)	43.1
Free iron oxides (g/kg)	17.0
Amorphous iron oxides (g/kg)	6.7
Total Al (g/kg)	93.7
Total Mn (g/kg)	0.627
CEC (cmol/kg)	12.7
Particle size (%)
Sand (>0.05 mm)	31.8
Silt (0.002–0.05 mm)	55.6
Clay (<0.002 mm)	12.6
As fractions (mg/kg)
F1	0.045
F2	0.082
F3	0.199
F4	2.59
F5	1.77
F6	16.5