The effect of adsorbed lipid on pyrite oxidation under biotic

The subsequent oxidation of the mineral by the aqueous Fe 3+ is referred to as the "indirect" mechanism of pyrite oxidation . This mechanism is in contrast to the "direct" mechanism, that involves the oxidation of the pyrite by surface colonized bacteria (either by enzymatic or non-enzymatic means) [ 8 , 20 ].

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Deep abiotic weathering of pyrite | Science

Pyrite, also called fool's gold, is an iron sulfide mineral that is very commonly found in rock but is almost nonexistent in sediments today. Pyrite oxidizes quickly and is a major source of sulfur to the ocean, but it is also a proxy for the oxygen content historically in Earth's atmosphere. Gu et al. conducted a set of detailed observations of the pyrite oxidation process in a shale unit.

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Pyrite oxidation under simulated acid rain weathering conditions

Minerals; Oxidation-Reduction; Sulfides/chemistry* Substances. Acid Rain; Minerals; Sulfides; pyrite; Iron; Grant support. 135/135 Program of the Institute of Geochemistry, CAS/ 2010AA09Z207/863 High Technology Research and Development Program of China/

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Pyrite disease - Palaeo-Electronica

Further oxidation of iron in the efflorescent minerals provides an additional Fe 3+ oxidizer for the pyrite (Rimstidt and Vaughan, 2003). Oxidation is further sustained by movement of electrons from the bulk of the pyrite crystal (Rimstidt and Vaughan, 2003) and from the nearby surface (Becker et al., 2001; Rosso and Becker, 2003).

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Experimental Study of Pyrite Oxidation at pH 6-9 and 30°C By

Pyrite oxidation was carried out under conditions of constant pH, pt^ and temperature in a thermostadted glass reaction vessel, with a magnetic stirrer suspended from the cap and with two side ports.

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Triple oxygen isotope insight into terrestrial pyrite oxidation

Pyrite oxidation proceeds via one-electron transfer steps occurring at anode sites on the mineral surface and thus involves oxygen-bearing sulfur intermediate species (S 2 O 2 2 −, S 3 O 6 2 −, and SO 3 2 −) .

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PDF) Pyrite Decay: cause and effect, prevention and cure

Pyrite (FeS2) is a common mineral found in igneous, sedimentary and metamorphic rocks; it may be present in petrology, mineral and palaeontological collections. Pyrite decay, or pyrite oxidation, has been recorded since the 19th century and various

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The causes behind pyrite oxidation - and acid mine

Pyrite oxidation, which can lead to acid mine drainage, is a concern for miners all across the globe. However, little is known about the processes that cause this phenomenon. To investigate the

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Surface Oxidation of Pyrite as a Function of pH | Environmental

2019. 5. 25. · Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen.

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About kinetic pyrite oxidation - The Geochemist's Workbench

2014. 12. 5. · Then, I made new equation (eq.1) for representing pyrite oxidation instead of eq.1 in thermodynamic database (not attached). When I set the mineral volume in Initial pane like Pyrite_oxidation_1, the calculation didn’t converged. On the other hand, only in the case like Pyrite_oxidation_2, the calculation converged.

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geochemistry - Difference between pyrite oxidation and

Oxidation and dissolution are not the same processes, but they are related when discussing the breakdown of pyrite in near surface environments. Dissolution is a process(*1) in which the chemical components of a solid become part of a liquid, in the liquid state.

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