Research Article
Dissolution of Metals from Biosolid-Treated Soils by Organic Acid Mixtures
Table 7
Metals release kinetics of biosolid-treated Romona soil (135 Mg ha−1) in different concentrations of organic acid (OA) mixtures.
| Element | OA concentration | Metal concentration (mg kg−1) | 15 min | 30 min | 1 hr | 2 hrs | 4 hrs | 8 hrs | 24 hrs | 48 hrs |
| Cd | 0.001 M | 0.055 | 0.059 | 0.063 | 0.066 | 0.068 | 0.073 | 0.089 | 0.091 | 0.01 M | 0.18 | 0.19 | 0.20 | 0.21 | 0.23 | 0.25 | 0.29 | 0.30 | 0.1 M | 0.79 | 0.83 | 0.88 | 0.92 | 1.01 | 1.10 | 1.26 | 1.29 |
| Cr | 0.001 M | 0.07 | 0.08 | 0.09 | 0.10 | 0.13 | 0.16 | 0.22 | 0.23 | 0.01 M | 0.23 | 0.27 | 0.30 | 0.34 | 0.38 | 0.46 | 0.69 | 0.71 | 0.1 M | 0.91 | 1.07 | 1.13 | 1.23 | 1.47 | 1.80 | 2.63 | 2.68 |
| Cu | 0.001 M | 0.86 | 0.88 | 0.92 | 0.97 | 1.05 | 1.15 | 1.38 | 1.42 | 0.01 M | 2.21 | 2.35 | 2.49 | 2.63 | 2.80 | 2.93 | 3.59 | 3.66 | 0.1 M | 7.6 | 7.8 | 8.3 | 8.9 | 9.4 | 10.1 | 12.6 | 12.7 |
| Ni | 0.001 M | 0.53 | 0.55 | 0.59 | 0.62 | 0.66 | 0.68 | 0.79 | 0.81 | 0.01 M | 1.57 | 1.67 | 1.80 | 1.93 | 2.01 | 2.13 | 2.52 | 2.57 | 0.1 M | 6.8 | 7.3 | 7.8 | 8.4 | 8.9 | 9.5 | 11.0 | 11.3 |
| Pb | 0.001 M | 0.021 | 0.023 | 0.025 | 0.030 | 0.035 | 0.044 | 0.063 | 0.065 | 0.01 M | 0.06 | 0.07 | 0.08 | 0.09 | 0.11 | 0.13 | 0.19 | 0.20 | 0.1 M | 0.32 | 0.34 | 0.38 | 0.45 | 0.53 | 0.62 | 0.90 | 0.94 |
| Zn | 0.001 M | 3.96 | 4.19 | 4.35 | 4.48 | 4.69 | 4.91 | 5.60 | 5.66 | 0.01 M | 21.4 | 22.6 | 23.3 | 24.8 | 25.7 | 27.1 | 30.7 | 31.0 | 0.1 M | 100 | 103 | 108 | 114 | 117 | 121 | 134 | 137 |
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