TABLE 1.
Physical characterization of soils
| Soil property (unit) | Less contaminated soils
|
Heavily contaminated soils
|
||||||
|---|---|---|---|---|---|---|---|---|
| AC | CC | JC | KC | AT | CT | JT | KT | |
| Texture | Silty clay loam | Silty clay | Loam | Loam | Silty clay loam | Silty clay | Loam | Loam |
| Clay (%) | 34 | 48 | 16 | 20 | 32 | 56 | 12 | 20 |
| Organic C (%) | 1.37 | 1.23 | 0.99 | 2.91 | 1.84 | 5.65 | 3.34 | 3.76 |
| pH | 6.5 | 7.8 | 7.3 | 5.5 | 7.7 | 7.6 | 7.7 | 6.8 |
| Cation exchange capacity (meq 100 g−1) | 17.0 | 18.7 | 6.3 | 19.3 | 17.4 | 20.3 | 7.8 | 10.2 |
| Cadmium (μg g−1) | NDa | ND | ND | ND | ND | ND | ND | ND |
| Chromium (μg g−1) | 16.4 | 26.3 | 5.0 | 10.8 | 14.2 | 118.5 | 5.0 | 9.8 |
| Lead (μg g−1) | 11.8 | 31.2 | 7.0 | 7.8 | 154 | 332 | 8.6 | 9.9 |
| Mercury (μg g−1) | ND | ND | ND | ND | ND | 0.455 | ND | ND |
| PAH (mg kg−1) | 0.220 | 15.0 | 37.0 | 0.0720 | 473 | 86.0 | 320 | 3.35 |
| Priority pollutant PAHs (mg kg−1) | 0.105 | 3.06 | 1.46 | 0.0170 | 27.1 | 10.5 | 18.2 | 0.262 |
| Total petroleum hydrocarbons (mg kg−1) | 21 | 54 | 3,050 | 18 | 4,650 | 2,450 | 27,500 | 6,250 |
| Mitrotox assay result | NAb | NA | NA | NA | Toxic | Nontoxic | Toxic | Nontoxic |
a
ND, none detected.
b
NA, not available.