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Manganese and trace-metal mobility under reducing conditions following in situ oxidation of TCE by KMnO4: a laboratory column experiment

, : Manganese and trace-metal mobility under reducing conditions following in situ oxidation of TCE by KMnO4: a laboratory column experiment. Journal of Contaminant Hydrology 119(1-4): 13-24

The stability of Mn oxides, and the potential for mobilization of associated trace metals, were assessed by simulating the onset of microbially-mediated reducing conditions in a continuous-flow column experiment. The column had previously been used for an in situ chemical oxidation (ISCO) experiment in which trichloroethylene was reacted with permanganate in the presence of aqueous trace metals, which produced Mn oxyhydroxides (MnO(x)) that sequestered the trace metals and coated the column sand. The column influent solution represented the incursion of ambient groundwater containing dissolved organic carbon (DOC) into an ISCO treatment zone. The influx of DOC-containing groundwater initiated a series of cation-exchange, surface-complexation and reductive-dissolution reactions that controlled the release of aqueous metals from the system. Peak concentrations in the effluent occurred in the order Na, Mo, Cr, Zn, K, Mn, Fe, Pb, Mg, Ni, Cu and Ca. Manganese release from the column was controlled by a combination of cation exchange, reductive dissolution and precipitation of rhodochrosite. The trend in Fe concentrations was similar to that of Mn, and also resulted from a combination of reductive dissolution and cation exchange. Cation exchange and/or surface-complexation were the primary mechanisms controlling Cu, Ni, Mo and Pb release to solution, while Zn and Cr concentrations did not display coherent trends. Although metal release from the treatment zone was evident in the data, concentrations of trace metals remained below 0.05 mg L(-1) with the exception of Mo which reached concentrations on the order of 1 mg L(-1). The establishment of anaerobic conditions in ISCO-treated aquifers may result in a prolonged flux of aqueous Mn(II), but with the exception of MoO(4)(2-), it is unlikely that trace metals sequestered with MnO(x) during ISCO will be released to the groundwater in elevated concentrations.


PMID: 20889229

DOI: 10.1016/j.jconhyd.2010.08.005

Other references

Stoll W.C., 1961: A short review of Perus mineral resources. Outlines the principal occurrences and evaluates the economic significance of petroleum, coal, phosphate and other nonmetallic resources, and gold (vein and placer deposits), vanadium, molybdenum, porphyry copper, iron, and polymetallic ores in Pe...

Ethridge; Erwin; Pickett, 1995: Metastability of NbN in the ordered vacancy NbO phase. Physical Review. B, Condensed Matter 52(12): R8589-R8592

Power, J.; Greenfield, P.F.; Nielsen, L.; Reid, S., 1992: Modelling the growth and protein production by insect cells following infection by a recombinant baculovirus in suspension culture. A mathematical model has been developed to describe the growth and infection of insect cells by recombinant baculoviruses. The model parameters were determined from a series of independent experiments involving batch suspension culture. The profil...

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Braun, U.; Gansohr, B.; Fluckiger, M., 2003: Radiographic findings before and after oral administration of a magnet in cows with traumatic reticuloperitonitis. Objective: To evaluate by use of radiography the efficacy of oral administration of magnets in the treatment of traumatic reticuloperitonitis in cows. Animals: 90 cows referred because of indigestion. Procedure: Radiography of the reticulum was pe...

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Li, J.H.iningen, A.-Van, 1991: Sulfur emission during slow pyrolysis of kraft black liquor. Tappi journal 74(83): 237-239