Table 1 Overview of the sequential extraction procedure with nominal target phases
From: Metal contamination in a sediment core from Osaka Bay during the last 400 years
Step | Fraction | Nominal target phases | Extractant |
|---|---|---|---|
1 | Acid soluble | Soluble and exchangeable species, carbonates | 0.11 M acetic acid (repeated) |
2 | Reducible | Fe and Mn oxyhydroxides | 0.5 M hydroxylamine hydrochloride, pH = 1.5 |
3 | Oxidizable | Organic matter and sulfides | 8.8 M hydrogen peroxide followed by 1 M ammonium acetate, pH = 2 |
4 | Residual | Silicates and well-crystalline oxides | Nitric acid, hydrofluoric acid, perchloric acid |