Table 1.
Characterization of Cd, Pb and Zn concentrations in 3 samples from a contaminated soil by atomic absorption spectroscopy following different extraction protocols. MTE, metallic trace element.
| Soil ID | Soil pH | Extraction Method | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Aqua Regia Total MTEs (mg/kg) |
EDTA + Ammonium Acetate Solution, pH 4.65 Available MTEs (mg/kg) |
CaCl2 Solution Soluble MTEs (mg/kg) |
||||||||
| Cd | Pb | Zn | Cd | Pb | Zn | Cd | Pb | Zn | ||
| S1 | 6.9 | 5 | 131 | 410 | 3 | 73 | 69 | ND * | ND * | 0.547 |
| S2 | 6.8 | 4 | 117 | 318 | 3 | 69 | 91 | ND * | ND * | 0.274 |
| S3 | 6.9 | 2 | 59 | 200 | 1 | 30 | 51 | ND * | ND * | 0.434 |
* Quantity below the limit of detection (LOD) of the system.