Ferrous sulfide sludge
Internal Solution-ID: S2526
This solution is used in 4 media and was first defined in medium 1267.
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| Compound | Amount | Unit | Conc. [g/L] | Conc. [mM] | |
|---|---|---|---|---|---|
| FeSO4 x 7 H2O | 15.4 | g | 154 | 553.927 | |
| Na2S x 9 H2O | 12.3 | g | 123 | 512.112 | |
| Distilled water | 100.0 | ml | - | - | |
| 1 Heat distilled water to 50°C in a 250 ml beaker with a stir bar present. While rapidly stirring the water, add the ferrous sulfate followed immediately by the sodium sulfide. The formed black FeS sludge is decanted into a glass bottle that can be stoppered. The FeS is allowed to settle for several hours and then the overlying water is decanted and replaced. This procedure is repeated at least five times to wash the FeS. After washing, the pH of the FeS solution should be close to neutrality. The FeS suspension can be kept in closed bottles or tubes under a nitrogen atmosphere for at least three months. | |||||