Research Article
Ranges of B, Cd, Cr, Cu, Fe, Pb, Sr, Tl, and Zn Concentrations and Isotope Ratios in Environmental Matrices from an Urban Area
Table 1
Sequential extraction scheme.
| Code | Extracted phase | Solution | Volume (mL) |
| F1 | Exchangeable | Distilled water | 40 | F2 | Carbonates | 0.11 M·CH3COOH (acetic acid) | 40 | F3 | Reducible | 0.1 M·NH2OH·HCl (hydroxylamine hydrochloride) | 40 | F4 | Oxidizable | 8.8 M·H2O2 (hydrogen peroxide) | 10 + 10 | | | 1 M·CH3COONH4 (ammonium acetate) pH 2 | 50 | F5 | Residual I | Aqua regia | 20 | F6 | Residual II | HF | 10 |
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