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Impacts of hydrous manganese oxide on the retention and lability of dissolved organic matter

Overview of attention for article published in Geochemical Transactions, February 2018
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Title
Impacts of hydrous manganese oxide on the retention and lability of dissolved organic matter
Published in
Geochemical Transactions, February 2018
DOI 10.1186/s12932-018-0051-x
Pubmed ID
Authors

Jason W. Stuckey, Christopher Goodwin, Jian Wang, Louis A. Kaplan, Prian Vidal-Esquivel, Thomas P. Beebe, Donald L. Sparks

Abstract

Minerals constitute a primary ecosystem control on organic C decomposition in soils, and therefore on greenhouse gas fluxes to the atmosphere. Secondary minerals, in particular, Fe and Al (oxyhydr)oxides-collectively referred to as "oxides" hereafter-are prominent protectors of organic C against microbial decomposition through sorption and complexation reactions. However, the impacts of Mn oxides on organic C retention and lability in soils are poorly understood. Here we show that hydrous Mn oxide (HMO), a poorly crystalline δ-MnO2, has a greater maximum sorption capacity for dissolved organic matter (DOM) derived from a deciduous forest composite Oi, Oe, and Oahorizon leachate ("O horizon leachate" hereafter) than does goethite under acidic (pH 5) conditions. Nonetheless, goethite has a stronger sorption capacity for DOM at low initial C:(Mn or Fe) molar ratios compared to HMO, probably due to ligand exchange with carboxylate groups as revealed by attenuated total reflectance-Fourier transform infrared spectroscopy. X-ray photoelectron spectroscopy and scanning transmission X-ray microscopy-near-edge X-ray absorption fine structure spectroscopy coupled with Mn mass balance calculations reveal that DOM sorption onto HMO induces partial Mn reductive dissolution and Mn reduction of the residual HMO. X-ray photoelectron spectroscopy further shows increasing Mn(II) concentrations are correlated with increasing oxidized C (C=O) content (r = 0.78, P < 0.0006) on the DOM-HMO complexes. We posit that DOM is the more probable reductant of HMO, as Mn(II)-induced HMO dissolution does not alter the Mn speciation of the residual HMO at pH 5. At a lower C loading (2 × 102 μg C m-2), DOM desorption-assessed by 0.1 M NaH2PO4extraction-is lower for HMO than for goethite, whereas the extent of desorption is the same at a higher C loading (4 × 102 μg C m-2). No significant differences are observed in the impacts of HMO and goethite on the biodegradability of the DOM remaining in solution after DOM sorption reaches steady state. Overall, HMO shows a relatively strong capacity to sorb DOM and resist phosphate-induced desorption, but DOM-HMO complexes may be more vulnerable to reductive dissolution than DOM-goethite complexes.

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The data shown below were compiled from readership statistics for 55 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 55 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 14 25%
Researcher 9 16%
Student > Doctoral Student 7 13%
Student > Master 4 7%
Unspecified 2 4%
Other 5 9%
Unknown 14 25%
Readers by discipline Count As %
Environmental Science 10 18%
Earth and Planetary Sciences 8 15%
Chemistry 6 11%
Agricultural and Biological Sciences 4 7%
Unspecified 2 4%
Other 5 9%
Unknown 20 36%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 21 February 2018.
All research outputs
#18,587,406
of 23,023,224 outputs
Outputs from Geochemical Transactions
#60
of 81 outputs
Outputs of similar age
#334,984
of 446,086 outputs
Outputs of similar age from Geochemical Transactions
#3
of 3 outputs
Altmetric has tracked 23,023,224 research outputs across all sources so far. This one is in the 11th percentile – i.e., 11% of other outputs scored the same or lower than it.
So far Altmetric has tracked 81 research outputs from this source. They receive a mean Attention Score of 3.4. This one is in the 2nd percentile – i.e., 2% of its peers scored the same or lower than it.
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