Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57....9a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 1, pp.9-14
Other
8
Scientific paper
The metastable iron sulfide mineral mackinawite commonly forms in anoxic sediments in the region where elevated concentrations of dissolved Mn 2+ are also observed. There is, consequently, a potential for significant interactions between dissolved Mn and mackinawite. We have experimentally investigated adsorption of Mn 2+ on mackinawite and its coprecipitation with mackinawite using chemostat techniques. The very fine-grained nature of mackinawite results in adsorption being quantitatively (generally > 90%) much more important than coprecipitation. Adsorption of Mn 2+ follows a Langmuir-type isotherm and decreases substantially with increasing salinity. The partition coefficient for Mn 2+ with mackinawite, in low ionic strength solutions at 25°C extrapolated to zero reaction rate, is . It approximately doubles for every 20°C increase in temperature, and, over the range of conditions investigated, was found to be close to independent of pH and the mole fraction of MnS. The partition coefficient is 1.8 (±0.35) × 10 -3 in seawater of S = 35 at 25°C at a slow reaction rate (0.5 mol L -1 min. -1 ). It also decreases by about a factor of 3 at high precipitation rates, possibly because of the formation of a greater proportion of amorphous-FeS rather than mackinawite or an inability of the sorption reaction to keep up with the rate of formation of new surfaces.
Arakaki Takeshi
Morse John W.
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