GEOC 100 |
| The abiotic, oxidative dissolution of pyrite (FeS2) from various geological locations and origins was studied in a batch reactor system. Initial results showed that pyrite preparation methods, especially particle size classification, are very important and can affect the rate of dissolution dramatically. Different rates and extent of dissolution were observed among the pyrite samples at the same experimental conditions. Sedimentary pyrite samples, especially those associated with coal, dissolve faster than hydrothermal pyrite samples. This is explained in part by the specific surface area and morphology of the different types of pyrite. An electrochemical technique was also used to investigate pyrite dissolution. With this technique, the rate of pyrite dissolution can be controlled via fixed applied potential, and the oxidation-reduction half reactions can be studied separately. Effects of pH, dissolved oxygen, temperature, and different electrolytes on pyrite dissolution were studied. |
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Physical Chemistry of Soil and Aquifer Systems: A Symposium in Honor of Garrison Sposito
1:30 PM-4:45 PM, Tuesday, 12 September 2006 Moscone Center -- Room 256, Oral
Sci-Mix
Division of Geochemistry |