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Procedure used for 5-step Tessier sediment extractions. |
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| Targeted Fraction |
Method |
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| 1. Exchangeables |
8 mL 1.0 M MgCl2 adjusted to pH = 5–7 1 hr at room temperature |
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| 2. Carbonates |
8 mL 1.0 M sodium acetate adjusted to pH = 5 with acetic acid 5 hrs at room temperature |
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| 3. Fe and Mn oxides |
10 mL 0.04 M Hydroxylamine HCl in 25% (v/v) acetic acid 6 hrs at 96°C |
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| 4. Organics/Sulfides |
3 mL 30% H2O2 adjusted to pH 2 with HNO3 2 hrs at 85°C 3 mL 30% H2O2 adjusted to pH 2 with HNO3 2 hrs at 85°C Cool. At room temperature add 5 mL of 3.2 N ammonium acetate in 20% (v/v) HNO3, dilute to 20 mL and agitate an additional 30 minutes |
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| 5. Residual |
Microwave digestion [99] |
Koretsky et al. Geochemical Transactions 2006 7:11 doi:10.1186/1467-4866-7-11 |
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