Redox Equilibria of Iron in Acid Mine Waters

Nordstrom, D. Kirk; Jenne, E.A.; Ball, James W.

doi:10.1021/bk-1979-0093.ch003

Cited by 117 publications

(59 citation statements)

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“…NORDSTROM et al (1979) have found an equilibrium of the redox couple Fe 2+ /Fe 3+ and/or Fe 2+ /Fe(OH) 3 (s) in a strong acid environment (pH = 1-2) with pε >4. Despite the input of oxygen, a shift to very high positive values of the redox couple O 2 /H 2 O was not measured.…”

Section: First Oxidation Step Of Pyrite Oxidation (Sulfide Oxidation)mentioning

confidence: 99%

“…Redox reactions of sulfur are very common in groundwater, surface water and in the marine environment (NORDSTROM et al, 1979;LEUCHS, 1988;ALPERS & BLOWES, 1994; VAN BERK & WISOTZKY, 1995;. The input of an oxidant (O 2 , NO 3 -, Fe(III)) into a system which contains sulfide minerals leads to mobilising reactions (increase of mineralisation and decrease of pH).…”

Section: 8introductionmentioning

confidence: 99%

See 1 more Smart Citation

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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Section: First Oxidation Step Of Pyrite Oxidation (Sulfide Oxidation)mentioning

confidence: 99%

Section: 8introductionmentioning

confidence: 99%

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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“…We suggest that the Eh values for the experimental solutions can be determined from the Fe 3+ Fe 2+ redox couple because Eh values in acid mine drainage and groundwater are determined from the Fe 3+ Fe 2+ redox couple (Nordstrom et al, 1979;Macalady et al, 1990;Grenthe et al, 1992). We compared measured Eh values (Eh m ) with Eh values (Eh c ) calculated from speciation analyses by means of the REACT program ( Fig.…”

Section: Reactions Of Fe 3+ During Oxidation Of Pyritementioning

confidence: 99%

Comparison of rate laws for the oxidation of five pyrites by dissolved oxygen in acidic solution

Manaka

2007

Journal of Mineralogical and Petrological Sciences

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Pyrites from five localities were oxidized with dissolved oxygen (DO) in acidic solution at 298 K. The objective of this study was to compare the oxidation rates of pyrite samples with different impurity contents. Initial conditions were a solution pH adjusted to approximately 4 and air saturation. DO, Fe 2+ , Fe(III) (as Fe 3+ and Fe(III) OH complexes), and SO 4 2− concentrations in the experimental solutions were periodically measured along with pH and redox potential (Eh). On the basis of the relationship between DO concentration and reaction duration, the rate laws for the oxidation of the pyrites were obtained. The rate laws differed for the various pyrites and can be expressed as follows:where the unit of oxidation rate is mol m ), t is time (s), k is a rate constant at pH ~ 4, and n is the reaction order (0.5 1). The differences in the rate laws were due to differences in the oxidation rates of Fe 2+ during the oxidation of the pyrites, and the differences in the oxidation rates of Fe 2+ were related to the occurrence of impurities in the pyrites. Oxidation of Fe 2+ was accelerated by increases in the total amount of impurities in the pyrite. Precipitation of the Fe 3+ produced during the reaction was promoted by increased amounts of arsenic in the pyrites.

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“…• An acid mine water, which corresponds to an analysis of Nordstrom et al (1979, their Table II, Column B) in the Hornet effluent. We also are studying two other compositions: • A carbonate aquifer groundwater composition that was part of Example 5 of INTERA (1983), a study comparing EQ3/6 with PHREEQE (Parkhust et al, 1980).…”

Section: Evaluating Common Minerals In the Ca-si-co 2 -H 2 O Systemmentioning

confidence: 99%

State of chemical modeling modules for the degradation of concrete and cements

Llnl¹

1997

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Redox Equilibria of Iron in Acid Mine Waters

Cited by 117 publications

References 0 publications

Redox: fundamentals, processes, and applications

Redox: fundamentals, processes, and applications

Comparison of rate laws for the oxidation of five pyrites by dissolved oxygen in acidic solution

State of chemical modeling modules for the degradation of concrete and cements

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