Effects of dissolved organic matter on the co-transport of mineral colloids and sorptive contaminants

Cheng, Tao; Saiers, James E.

doi:10.1016/j.jconhyd.2015.04.005

Cited by 26 publications

(6 citation statements)

References 60 publications

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“…The behavior of Fe and Al could be explained by the release either of OM complexes (organometallic complexes; Lucas, 2001;Patel-Sorrentino et al, 2006) or mineral colloids (kaolinite, gibbsite and goethite; Cheng and Saiers, 2015) during percolation through the Bh. These complexes or colloids are subsequently partially retained during percolation through the kaolinitic material.…”

Section: Transfers Of Carbon and Major Elementsmentioning

confidence: 99%

“…6. The peak A corresponds to fulvic-like humic compounds, the peak C to humic-like humic compounds and the peak P to protein-like compounds that indicate an active bacterial activity (Coble, 1996); these peaks are characteristic of natural terrestrial DOM. The peaks S1 and S2 have been related to non-humiclike labile matter related to microbial activity (Singh et al, 2010) or to fulvic-like compounds (Stedmon and Markager, 2005).…”

Section: Fluorescence Properties Of Percolation Solutionsmentioning

confidence: 99%

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Soil organic carbon mobility in equatorial podzols: soil column experiments

Merdy

Lucas

Coulomb

et al. 2021

SOIL

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Abstract. Transfer of organic carbon from topsoil horizons to deeper horizons and to the water table is still little documented, in particular in equatorial environments, despite the high primary productivity of the evergreen forest. Due to its complexing capacity, organic carbon also plays a key role in the transfer of metals in the soil profile and, therefore, in pedogenesis and for metal mobility. Here we focus on equatorial podzols, which are known to play an important role in carbon cycling. We carried out soil column experiments using soil material and percolating solution sampled in an Amazonian podzol area in order to better constrain the conditions of the transfer of organic carbon at depth. The dissolved organic matter (DOM) produced in the topsoil was not able to percolate through the clayey, kaolinitic material from the deep horizons and was retained in it. When it previously percolated through the Bh material, there was production of fulvic-like, protein-like compounds and small carboxylic acids able to percolate through the clayey material and increase the mobility of Al, Fe and Si. Podzolic processes in the Bh can, therefore, produce a DOM likely to be transferred to the deep water table, playing a role in the carbon balances at the profile scale and, owing to its complexing capacity, playing a role in deep horizon pedogenesis and weathering. The order of magnitude of carbon concentration in the solution percolating at depth was around 1.5–2.5 mg L−1. Our findings reveal a fundamental mechanism that favors the formation of very thick kaolinitic saprolites.

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Section: Transfers Of Carbon and Major Elementsmentioning

confidence: 99%

Section: Fluorescence Properties Of Percolation Solutionsmentioning

confidence: 99%

Soil organic carbon mobility in equatorial podzols: soil column experiments

Merdy

Lucas

Coulomb

et al. 2021

SOIL

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“…Finally, co-solutes like dissolved organic matter or phosphate may compete with DNA, being a biopolymer and colloidal particle, for adsorption sites on particle surfaces, thereby reducing DNA adsorption. The reduction of colloid retention in the presence of organic matter has been well described in the literature (Cheng & Saiers, 2015;Kretzschmar et al, 1995;Morales et al, 2011;Yang et al, 2015).…”

Section: Adsorption and Aggregation In Surface Watermentioning

confidence: 79%

Artificial DNA in hydrology

Foppen

2023

WIREs Water

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The use of artificial DNA (artDNA) in hydrological applications is becoming increasingly popular, either in dissolved form (dissolved artDNA) or encapsulated and protected by a layer (encDNA). DNA can be detected even at low concentrations and offers the ability to create numerous uniquely identifiable DNA labels, making it ideal for a wide range of multi‐tracer applications. A literature review revealed that in streams, the breakthrough curve of artDNA is visually similar to that of a conservative tracer in terms of time to rise, time to peak, and dispersion coefficient. In saturated porous or fractured media, the time of first arrivals and time to peak of artDNA are usually earlier than that of a conservative tracer, indicating size exclusion of both dissolved artDNA and encDNA. Transport in subsurface media can be described by one‐site or two‐site kinetic attachment. The recovery of artDNA in environmental systems is always less than 100% due to adsorption and decay. Although the processes responsible for both are known, yet they cannot be quantified or predicted in mass balance approaches. Despite these limitations, artDNA can be used in various hydrological applications in environmental studies and engineering. Finally, attention should focus on the use of rapid detection of DNA tracers in the field, on upscaling of DNA production, and on increasing the efficiency of the DNA encapsulation process.This article is categorized under: Science of Water > Hydrological Processes Science of Water > Water Quality Science of Water > Methods

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“…Contrary to MAN, the WDC from the acidic forest soils of MIT and LUE were likely better dispersed at pH values much lower than the particles point of zero charge. The strong binding of (dissolved) organic matter to Fe-and Al-(hydr)oxides at low pH values (Kaiser et al, 1997) can promote the mobilization of particles (Kretzschmar et al, 1995;Philippe and Schaumann, 2014;Cheng and Saiers, 2015), thus enhancing also the mobility of P bound to these particles. The (weak) podzolic features of the LUE soil would support the theory of diffusion of OM-Fe/Al-P complexes into the DGTs.…”

Section: Soil Ph Wdc Composition and P-speciation As Drivers For Wdc Mobility And P-deliverymentioning

confidence: 99%

Forest Soil Colloids Enhance Delivery of Phosphorus Into a Diffusive Gradient in Thin Films (DGT) Sink

Konrad

Billiy

Regenbogen

et al. 2021

Front. For. Glob. Change

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Phosphorus (P) is preferentially bound to colloids in soil. On the one hand, colloids may facilitate soil P leaching leading to a decrease of plant available P, but on the other hand they can carry P to plant roots, thus supporting the P uptake of plants. We tested the magnitude and the kinetics of P delivery by colloids into a P sink mimicking plant roots using the Diffusive Gradients in Thin-Films (DGT) technique. Colloids were extracted with water from three forest soils differing in parent material using a method based on dispersion and sedimentation. Freeze-dried colloids, the respective bulk soil, and the colloid-free extraction residue were sterilized and mixed with quartz sand and silt to an equal P basis. The mixtures were wetted and the diffusive fluxes of P into the DGTs were measured under sterile, water unsaturated conditions. The colloids extracted from a P-poor sandy podzolic soil were highly enriched in iron and organic matter compared to the bulk soil and delivered more P at a higher rate into the sink compared to bulk soil and the colloid-free soil extraction residue. However, colloidal P delivery into the sink was smaller than P release and transport from the bulk soil developed on dolomite rock, and with no difference for a soil with intermediate phosphorus-stocks developed from gneiss. Our results provide evidence that both the mobility of colloids and their P binding strength control their contribution to the plant available P-pool of soils. Overall, our findings highlight the relevance of colloids for P delivery to plant roots.

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Effects of dissolved organic matter on the co-transport of mineral colloids and sorptive contaminants

Cited by 26 publications

References 60 publications

Soil organic carbon mobility in equatorial podzols: soil column experiments

Soil organic carbon mobility in equatorial podzols: soil column experiments

Artificial DNA in hydrology

Forest Soil Colloids Enhance Delivery of Phosphorus Into a Diffusive Gradient in Thin Films (DGT) Sink

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