Oxidation products of Mn(II) in lake waters

doi:10.1016/0009-2541(84)90149-9

Chemical Geology

Volume 44, Issue 4, June 1984, Pages 359-383

https://doi.org/10.1016/0009-2541(84)90149-9 Get rights and content

Abstract

Oxygenation of Mn(II)-rich water samples taken from two English lakes (Esthwaite Water, Cumbria, and Rostherne Mere, Cheshire) during the summer months caused the precipitation of Mn-oxide, the process being catalysed by particulate matter. The Mnoxide formed resembles vernadite (δ-MnO₂) with regard to: (1) Mn oxidation state (> 3.6 in all but one case); and (2) its fine morphology (crumpled thin sheets) as determined by electron microscopy. The precipitates are, however, rather amorphous to X-rays, giving only very weak reflections which cannot be assigned unequivocally. Electron probe microanalysis shows the presence of a number of other elements in the Mn-containing phase. The most abundant is Ca (Ca/Mn weight ratio $⋍ 0.1$ ), others are Mg, Si, P, S, Cl, K, Ba and Fe. The precipitates contain much organic matter (20–30 wt.%) but little appears to be associated directly with the Mn phase. Only small amounts (∼ 1 wt.%) of humic substances are present. Some but not all of the specimens examined had the gross morphology of Metallogenium, a Mn-depositing bacterium.

Naturally occurring Mn-oxides present in Esthwaite Water during the summer resemble, the products of oxygenation in their fine morphology and contents of other elements. Mn-oxides present during the winter are somewhat different morphologically. In one summer sample of particulate matter from Esthwaite Water no Mn-oxide could be found by electron microscopic examination, but Mn was found concentrated in bacteria. This observation, the rapid rates of oxidation and the high Mn oxidation states, suggest that bacteria might play a rôle in catalysing the oxidation of Mn(II).

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Research paperOxidation products of Mn(II) in lake waters

Abstract

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

J. Colloid Interface Sci.

Geochim. Cosmochim. Acta

J. Colloid Sci.

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Chem. Geol.

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Geochim. Cosmochim. Acta

Some stability relations in the system Mn“O2“H2O at 25° and one atmosphere total pressure

Am. Mineral.

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Plant Soil

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Limnol. Oceanogr.

Manganese minerals in clays: a review

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Freshwater Biol.

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Limnol. Oceanogr.

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Nature (London)

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Hydrobiologia

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Research paper
Oxidation products of Mn(II) in lake waters

Some stability relations in the system Mn“O₂“H₂O at 25° and one atmosphere total pressure

The polarographic measurement of O₂, Fe²⁺, Mn²⁺ and S²⁻ in hypolimnetic water