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Pyrite preparation methodologies used in previous studies. In each method listed, the pyrite was hydrothermal in origin. |
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| Target Size Fraction (μm) |
Methodology |
Reference |
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| 125 – 250 μm |
The pyrite was crushed, soaked overnight in hot hydrofluoric acid, washed in distilled water, dried in air and sieved. Sieved pyrite was ultrasonically cleaned in ethanol, rinsed with 1 M nitric acid for one minute, triply rinsed with distilled water, and then with ethanol. The pyrite was dried with air and stored briefly in beakers. |
[14] McKibben, M.A., and Barnes, H.L. (1986) |
| 40 – 80 μm |
Powders were prepared by grinding in an agate mortar. The oxidation products were eliminated by rinsing with 10-2 MHNO3. |
[15] Bonnisell – Gissinger, P. et al. (1998) |
| 74–177 μm |
Samples were crushed using an agate mortar and pestle. The crushed pyrite was soaked overnight in hot hydrofluoric acid, washed in deoxygenated deionized water, dried in air, and sieved. |
[10] Kamei, G., and Ohmoto, H. (2000) |
| 105 – 150 μm |
Samples were dry ground in two steps: 1) a glass-cleaned ring pulverizer was used to reduce grain size and 2) an agate mortar was used to crush the particles to the desired particle size range. The ground pyrite was dry sieved. Samples were kept in a glass desiccator under vacuum after preparation to avoid surface oxidation. |
[16] Cruz, R., et al. (2001) |
| 150–250 μm |
Pyrite was ground using an agate mortar, sieved with ethanol, and then washed in an ultrasonic bath. Procedure was repeated until the ethanol was clear and free of fine particles after the ultrasonic bath treatment. |
[20] Descostes, M., et al. (2004) |
| 150 – 500 μm |
Crushed minerals were sieved, ultrasonically treated and washed repeatedly to remove fine particles, and then treated with 10% HCl for 2 hours to remove any preexisting oxide layer. The crushed mineral particles were rinsed with ethanol and allowed to dry. |
[17] McGuire, M.M., et al. (2001) |
| -0.30 mm |
Material was classified into various size fractions by wet-dry screening. Prior to leaching experiments, samples of the ground material were soaked in 3 M hydrochloric acid solution for 36 h, filtered, rinsed with double-distilled water, dried with acetone, and kept under vacuum in a desiccator. |
[18] Caldeira, C.L. et al. (2003) |
| 250 – 420 μm |
The pyrite was crushed, sieved, and rinsed with ethyl alcohol three to five times until the supernatant was clear. The samples were then sonicated in ethyl alcohol (repeated at least three times until the supernatant was clear). The grains were dried at 70°C for 12 h. |
[19] Jerz, J.K., and Rimstidt, D. (2004) |
| 37 – 74 μm |
Pyrite was ground in air for different periods. After grinding, samples were sieved under dry conditions and the size fraction between 200 and 400 mesh collected. |
[24] Sasaki, K. (1994) |
Wolfe et al. Geochemical Transactions 2007 8:9 doi:10.1186/1467-4866-8-9 |
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