Nickel mobilization in a groundwater well field: release by pyrite oxidation and desorption from manganese oxides
Article Abstract:
Nickel with concentrations of up to 4000 nM is released to the unsaturated zone of an abstracted groundwater during pyrite oxidation. The distribution of nickel in the groundwater may be affected by other factors such as the production of the iron compound Fe(OH)3, which can adsorb part of the released nickel, during pyrite oxidation. Nickel's affinity to manganese oxides is also demonstrated during pyrite oxidation. The large amount of nickel released to the groundwater may be due to the desorption of manganese oxides caused by the incomplete oxidation of Fe.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Potential role of bicarbonate during pyrite oxidation
Article Abstract:
Fourier transform infrared spectroscopy has proved that the exposure of pyrite to humidified CO2 plus O2 formed pyrite surface-CO2 complexes. The mechanisms that may account for the complexes could involve the formation of a weak pyrite surface-Fe(II)-HCO3 complex and the formation of a pyrite surface-carboxylic acid group complex [-Fe(II)SSCOOFe2+]. The mechanisms could enhance abiotic pyrite oxidation by accelerating regeneration of Fe3+. Results revealed that HCO3- increased abiotic pyrite oxidation.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Biogeochemical cycles of manganese and iron at the oxic-anoxic transition of a stratified marine basin (Orca Basin, Gulf of Mexico)
Article Abstract:
The microbial reduction of manganese (Mn) oxide in the Orca Basin, Gulf of Mexico, coupled with high organic matter oxidation, contributed much to the increase of dissolved Mn(II) in the area. Researchers further noted a significant increase in the salinity level of the basin, registering a 35% to 260% increase during the redox transition period. Oxidative degradation of organic matter in the area was also attributed to the increased residence time of organic-rich particles.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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