Organic matter mineralization in sediment of a coastal freshwater lake and response to salinization

Canavan, Richard W.; Slomp, Caroline P.; Jourabchi, Parisa; Cappellen, Philippe Van; Laverman, Anniet M.; Berg, Gerard van den

doi:10.1016/j.gca.2006.03.012

Cited by 113 publications

(118 citation statements)

References 71 publications

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“…Our results indicate that a sharp redox front develops over a short distance in the intertidal area due to the efficient removal of the reactant (NH 4 þ ) as soon as it comes in contact with O 2 . The computed rates are higher than those reported for freshwater lake sediments (7 Â 10 À9 mol N m À2 s À1 ; Canavan et al, 2006) and shallow coastal marine sediments (3.6 Â 10 À9 mol N m À2 s À1 ; Wang and Van Cappellen, 1996).…”

Section: Nitrogen Dynamicscontrasting

confidence: 61%

Flow and nutrient dynamics in a subterranean estuary (Waquoit Bay, MA, USA): Field data and reactive transport modeling

Spiteri¹,

Slomp²,

Charette³

et al. 2008

Geochimica et Cosmochimica Acta

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132

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A two-dimensional (2D) reactive transport model is used to investigate the controls on nutrient (NO 3 À , NH 4 þ , PO 4 ) dynamics in a coastal aquifer. The model couples density-dependent flow to a reaction network which includes oxic degradation of organic matter, denitrification, iron oxide reduction, nitrification, Fe 2+ oxidation and sorption of PO 4 onto iron oxides. Porewater measurements from a well transect at Waquoit Bay, MA, USA indicate the presence of a reducing plume with high Fe 2+ , NH 4 þ , DOC (dissolved organic carbon) and PO 4 concentrations overlying a more oxidizing NO 3 À -rich plume. These two plumes travel nearly conservatively until they start to overlap in the intertidal coastal sediments prior to discharge into the bay. In this zone, the aeration of the surface beach sediments drives nitrification and allows the precipitation of iron oxide, which leads to the removal of PO 4 through sorption. Model simulations suggest that removal of NO 3 À through denitrification is inhibited by the limited overlap between the two freshwater plumes, as well as by the refractory nature of terrestrial DOC. Submarine groundwater discharge is a significant source of NO 3 À to the bay.

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Section: Nitrogen Dynamicscontrasting

confidence: 61%

Flow and nutrient dynamics in a subterranean estuary (Waquoit Bay, MA, USA): Field data and reactive transport modeling

Spiteri¹,

Slomp²,

Charette³

et al. 2008

Geochimica et Cosmochimica Acta

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132

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“…AVS has been analysed by extraction on shallow sediments from lakes within the river Rhine system (Van den Berg et al, 2001;Van Griethuysen et al, 2003, 2004Canavan et al, 2006Canavan et al, , 2007, recent river sediments ( Van den Berg et al, 1999;Poot et al, 2007;Thomas, 2007), floodplains (Poot et al, 2007) and temporarily inundated wetlands (Van den Berg et al, 1998;Table 14). AVS extractions have been interpreted in terms of non-pyritic reduced sulphur in the references cited.…”

Section: Iron Sulphidesmentioning

confidence: 99%

“…Initial SO 4 concentration does not appear to be a controlling factor. The early diagenesis of sulphides is hard to explain quantitatively by geochemical transport modelling of the S chemistry; the same applies to explaining the AVS contents as part of the total, aqua regia-soluble S contents (Canavan et al, 2006(Canavan et al, , 2007.…”

Section: Iron Sulphidesmentioning

confidence: 99%

“…Extractions have been used to indicate the amount of Fe oxyhydroxides in Dutch sedimentary environments, but there is always a possibility of interference from other solids during the Fe oxide extraction (Martin et al, 1987;La Force & Fendorf, 2000). The results of these extractions also suggested the presence of Fe oxyhydroxides under SO 4 -reducing conditions (Canavan et al, 2006). This is an important observation because it shows that not all Fe oxyhyroxides present can be microbially reduced for the given time scale and that under reduced conditions an oxic mineral remains present that will be part of the sediment sorption capacity.…”

Section: Reactive Fe Mineralsmentioning

confidence: 99%

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The mineralogy of suspended matter, fresh and Cenozoic sediments in the fluvio-deltaic Rhine–Meuse–Scheldt–Ems area, the Netherlands: An overview and review

Griffioen

Klaver

Westerhoff

2016

Netherlands Journal of Geosciences

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Minerals are the building blocks of clastic sediments and play an important role with respect to the physico-chemical properties of the sediment and the lithostratigraphy of sediments. This paper aims to provide an overview of the mineralogy (including solid organic matter) of sediments as well as suspended matter as found in the Netherlands (and some parts of Belgium). The work is based on a review of the scientific literature published over more than 100 years. Cenozoic sediments are addressed together with suspended matter and recent sediments of the surface water systems because they form a geoscientific continuum from material subject to transport via recently settled to aged material. Most attention is paid to heavy minerals, clay minerals, feldspars, Ca carbonates, reactive Fe minerals (oxides, siderite, sulphides, glauconite) and solid organic matter because they represent the dominant minerals and their properties form a main issue in subsurface and water management. When possible and relevant, the amounts, provenance, relationship with grain size distribution, early diagenesis and palaeohydrological evolution are described. Tables with statistical data about the mineral contents and isotopic composition of carbonates and organic matter are presented as overviews. The review on the mineralogy of Dutch fluvial and marine environments is more extensive than that for the other sedimentary environments because the first two have been studied much more intensively than the others and they also form the larger part of the Dutch deposits. The focus is on the natural background mineralogy of Dutch sediments, but this is hard for recent sediments, largely because the massive hydraulic infrastructure present in the Netherlands has probably also affected the mineralogy and geochemistry of sediments deposited in recent centuries. Many findings are summarised, several of which lead to more general insights for the Dutch situation. Ca carbonates in sediments often have several provenances and thus must be considered as mixtures. Dolomite is commonly present in addition to calcite. The importance of biotite as weatherable mica is unclear. Weathering of heavy minerals plays some role but it is unclear in which way it affects the heavy mineral associations. Clays are usually dominated by illite, smectite and their interstratified variant, while kaolinite is usually below 20% and chlorite below 5%. Vermiculite is a minor constituent in fluvial clays and its illitisation presumably happens during early diagenesis in the marine environment. Opaque Fe hydroxides can be present in addition to Fe oxyhydroxide coatings and both will play a role in redox chemistry as reactive Fe minerals. Feldspars in marine sediments must be present but they have not been properly studied. The genesis of rattle stones and carbonate concretions has not been completely elucidated. The fraction of terrigeneous organic matter in estuarine and coastal marine sediments is substantial. The available data and information are spread irregularly over the country and the reviewed information discussed in this paper is derived from relatively small-scale studies dealing with a limited amount of analysed samples. Much information is available from the Scheldt estuaries in the southwestern part of the Netherlands partly due to the severe contamination of the Western Scheldt in recent decades.

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“…Most of the values were constrained from literature studies, following the general procedure adopted in similar modelling exercises (e.g. Van Cappellen and Wang, 1996;Canavan et al, 2006). Those denoted as "fitting parameters" were obtained by trial and error by fitting the model to the field data.…”

Section: P Dynamicsmentioning

confidence: 99%

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

Spiteri

Slomp

Regnier

et al. 2007

Journal of Contaminant Hydrology

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A 1D reactive transport model (RTM) is used to obtain a mechanistic understanding of the fate of phosphorus (P) in the saturated zone of two contrasting aquifer systems. We use the field data from two oxic, electron donor-poor, wastewater-impacted, sandy Canadian aquifers, (Cambridge and Muskoka sites) as an example of a calcareous and non-calcareous groundwater system, respectively, to validate our reaction network. After approximately 10 years of wastewater infiltration, P is effectively attenuated within the first 10 m downgradient of the source mainly through fast sorption onto calcite and Fe oxides. Slow, kinetic sorption contributes further to P removal, while precipitation of phosphate minerals (strengite, hydroxyapatite) is quantitatively unimportant in the saturated zone. Nitrogen (N) dynamics are also considered, but nitrate behaves essentially as a conservative tracer in both systems. The model-predicted advancement of the P plume upon continued wastewater discharge at the calcareous site is in line with field observations. Model results suggest that, upon removal of the wastewater source, the P plume at both sites will persist for at least 20 years, owing to desorption of P from aquifer solids and the slow rate of P mineral precipitation. Sensitivity analyses for the noncalcareous scenario (Muskoka) illustrate the importance of the sorption capacity of the aquifer solids for P in modulating groundwater N:P ratios in oxic groundwater. The model simulations predict the breakthrough of groundwater with high P concentrations and low N:P ratios after 17 years at 20 m from the source for an aquifer with low sorption capacity (b 0.02% w/w Fe(OH) 3 ). In this type of system, denitrification plays a minor role in lowering the N:P ratios because it is limited by the availability of labile dissolved organic matter.

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Organic matter mineralization in sediment of a coastal freshwater lake and response to salinization

Cited by 113 publications

References 71 publications

Flow and nutrient dynamics in a subterranean estuary (Waquoit Bay, MA, USA): Field data and reactive transport modeling

Flow and nutrient dynamics in a subterranean estuary (Waquoit Bay, MA, USA): Field data and reactive transport modeling

The mineralogy of suspended matter, fresh and Cenozoic sediments in the fluvio-deltaic Rhine–Meuse–Scheldt–Ems area, the Netherlands: An overview and review

Modelling the geochemical fate and transport of wastewater-derived phosphorus in contrasting groundwater systems

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