pyrite oxidation by ferric iron

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Ferric iron enhanced chloramphenicol oxidation in pyrite

Surface reactions and homogeneous Fenton mechanism have been included in the kinetic model to elucidate the CAP oxidation by the combination of ferric iron and FeS 2 /H 2 O 2 system. However further detailed researches on the evolution and speciation of sulfur and its role as an electron donor in the redox reactions should be carried out.

Aqueous pyrite oxidation by dissolved oxygen and by ferric iron

McKiBBEN M. A. 1984 Kinetics of aqueous oxidation of pyrite by ferric iron oxygen and hydrogen peroxide from pH 14 and 2040. Ph.D. thesis Pennsylvania State Univ. MCKIBBEN M. A. and BARNES H. L. 1986 Oxidation of pyrite in low temperature acidic solutions: Rate laws and surface textures.

The kinetics of the oxidation of pyrite by ferric ions and

The rate equations that have been presented by other researchers for the oxidation of pyrite by ferric ions are presented in Table 1. Garrels and Thompson 1960 proposed that the rate of oxidation of pyrite is inversely proportional to the total iron concentration. This rate equation means that in the absence of ferrous ions the rate of the

Aqueous pyrite oxidation by dissolved oxygen and by ferric iron

Rates of aqueous abiotic pyrite oxidation were measured in oxygensaturated and anaerobic Fe III saturated solutions with initial pH from 2 to 9. These studies included analyses of sulfite thiosulfate polythionates and sulfate and procedures for cleaning oxidation products from pyrite surfaces were evaluated.

AMD: Basic chemistry Lehigh University

The fourth reaction is the oxidation of additional pyrite by ferric iron. The ferric iron is generated in the reactions described above. This is the cyclic and self propagating part of the overall reaction and takes place very rapidly and continues until either ferric iron or pyrite is depleted.

Soluble microbial products decrease pyrite oxidation by

The rate of pyrite oxidation by ferric iron in sterile suspensions at pH 1.8 was reduced by 87 in the presence of SMP produced from autoclaved cells at a ratio of 0.3 mg DOC per mg total soluble ferric iron. Inhibition of pyrite oxidation by SMP was shown to be comparable to but weaker than the effect of a chelating synthetic siderophore DFAM.

Mechanism of bacterial pyrite oxidation

The oxidation by Ferrobacillus ferrooxidans of untreated pyrite FeS 2 as well as HClpretreated pyrite from which most of the acidsoluble iron species were removed was studied manometrically. Oxygen uptake was linear during bacterial oxidation of untreated pyrite whereas with HClpretreated pyrite both a decrease in oxygen uptake at 2 hr

Experimental Study of Pyrite Oxidation at pH 69 and 30 C By

first be noted that the solubility of a major pyrite oxidant ferric ironquot drops dramatically as pH is increased above 4 whereas studies of modern groundwater systems containing a redox oxygensulfide boundary do not

Ferric citrate Ferric citrate SigmaAldrich

Iron III citrate Iron III citrate hydrate. suitable for cell culturequot MSDS Search Analytical/Chromatography Standards Search Stockroom Reagents Cell Culture Chemical Synthesis

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