Research Article
Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO4)x(AsO4)y(OH)z·nH2O] at 25–45°C and pH 2–10
Table 1
Preparation and component of the synthetical basic ferric sulfate-arsenates.
| | Sample | Precursor solution (100 mL) | Solid composition [Fe(SO4)x(AsO4)y(OH)z·nH2O] | | Fe(III) + SO4 solution | H3AsO4 solution | Mole ratio | | Fe2(SO4)3·9H2O (g) | H2O (mL) | 1 M H3AsO4 (mL) | H2O (mL) | Fe/AsO4 | SO4/AsO4 |
| | FeSAsOH-1 | 5.6201 | 50 | 10 | 40 | 2.00 | 3.00 | Fe(SO4)0.27(AsO4)0.73(OH)0.27·0.26H2O | | FeSAsOH-2 | 8.4302 | 50 | 10 | 40 | 3.00 | 4.50 | Fe(SO4)0.37(AsO4)0.59(OH)0.49·0.28H2O | | FeSAsOH-3 | 8.4302 | 50 | 15 | 35 | 2.00 | 3.00 | Fe(SO4)0.27(AsO4)0.72(OH)0.30·0.21H2O | | FeSAsOH-4 | 8.4302 | 50 | 20 | 30 | 1.50 | 2.25 | Fe(SO4)0.28(AsO4)0.74(OH)0.22·0.28H2O + FeAsO4·0.75H2O mixture | | FeSAsOH-5 | 11.2402 | 50 | 20 | 30 | 2.00 | 3.00 | Fe(SO4)0.24(AsO4)0.70(OH)0.42·0.16H2O |
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