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.

Administration of Air and Water Resource and Solid Waste Management Programs, Nickel, Groundwater & Lakes Pollution, Manganese Compounds, Sweden, Water pollution control, Groundwater

---

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.

Analytical Laboratory Instrument Manufacturing, Analytical instruments, Infrared Spectrophotometers, Usage, Oxidation-reduction reaction, Oxidation-reduction reactions, Fourier transform infrared spectroscopy, Bicarbonates

---

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.

Manganese, Iron Compounds NEC, Iron compounds, Biogeochemical cycles

Similar abstracts:

• Abstracts: Determination of Cu and Cd content of groundwater colloids by solid sampling graphite furnace atomic absorption spectrometry
• Abstracts: Kinetics of the reduction of hexachloroethane by juglone in solutions containing hydrogen sulfide. Iron porphyrin and mercaptojuglone mediated reduction of polyhalogenated methanes and ethanes in homogeneous aqueous solution
• Abstracts: Genetic analysis of complex diseases. The future of genetic studies of complex human diseases. Genetic complexity and Parkinson's disease
• Abstracts: New tumor suppressor found - twice. Gene linked to commonest cancer. Monkey virus DNA found in rare human cancers
• Abstracts: Mass transfer limitation of biotransformation: quantifying bioavailability. Biotransformation of alpha-, beta, gamma-, and delta-hexachlorocyclohexane under methanogenic conditions

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.