Table 2 Concentrations of Cd fractions in soils amended with and without citric acid (CA) after a 6-week incubation at 25 °C; differing superscript letters in columns indicate significant differences; p = 0.05
Treatment | Cadmium fraction (mg kg−1) | |||||||
|---|---|---|---|---|---|---|---|---|
F1 | F2 | F3 | F4 | F5 | Sum | Total | Recovery rate (%) | |
Control | 4.62b | 11.8a | 2.75a | 0.94a | 0.75b | 20.9 | 20.4 | 102 |
CA | 5.66a | 9.17b | 2.72a | 0.98a | 2.24a | 20.8 | 20.2 | 103 |