Insights into colloid-mediated trace element release at the soil/water interface

Pédrot, Mathieu; Dia, Aline; Davranche, Mélanie; Coz, Martine Bouhnik‐Le; Hénin, Odile; Gruau, Gérard

doi:10.1016/j.jcis.2008.05.019

Cited by 145 publications

(99 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A positive correlation is also found between storm events and trace element concentrations in streams [73]. In fact, organic and inorganic colloids could play an important role in trace elements mobilization in soil sand water [74]. The possible implications for human health associated with these higher mobilization of chemical constituents from minerals and higher concentrations in natural waters are difficult to demonstrate.…”

Section: Heavy Rainfall and Floodsmentioning

confidence: 97%

Impact of climate change on waterborne diseases

Funari

Manganelli

Sinisi

2012

Annali Dell'Istituto Superiore Di Sanità

View full text Add to dashboard Cite

Abstract. Change in climate and water cycle will challenge water availability but it will also increase the exposure to unsafe water. Floods, droughts, heavy storms, changes in rain pattern, increase of temperature and sea level, they all show an increasing trend worldwide and will affect biological, physical and chemical components of water through different paths thus enhancing the risk of waterborne diseases. This paper is intended, through reviewing the available literature, to highlight environmental changes and critical situations caused by floods, drought and warmer temperature that will lead to an increase of exposure to water related pathogens, chemical hazards and cyanotoxins. The final aim is provide knowledge-based elements for more focused adaptation measures.Key words: climate change, waterborne diseases, microbial pathogens, chemical contaminants, toxic cyanobacteria.Riassunto (Effetto dei cambiamenti climatici sulle malattie trasmesse dall'acqua). I cambiamenti climatici e del ciclo idrologico metteranno a rischio la disponibilità d'acqua e aumenteranno l'esposizione ad acqua contaminata. Le alluvioni, le siccità, le grandi tempeste, le variazioni nella frequenza ed intensità delle piogge, il riscaldamento e l'aumento del livello del mare crescono in ogni parte del mondo e influenzeranno le caratteristiche biologiche e chimico-fisiche dell'acqua attraverso diversi meccanismi, con il conseguente aumento del rischio di malattie trasmesse dall'acqua. L'analisi della letteratura disponibile, presentata in questo articolo, evidenzia i cambiamenti ambientali e le situazioni critiche causate da alluvioni, siccità e crescente riscaldamento che causeranno un aumento di esposizione a patogeni, inquinanti chimici e cianotossine, legati all'acqua. Lo scopo è di fornire gli elementi scientifici di base per misure di adattamento mirate.Parole chiave: cambiamenti climatici, malattie trasmesse dall'acqua, microrganismi patogeni, contaminanti chimici, cianobatteri tossici.

show abstract

Section: Heavy Rainfall and Floodsmentioning

confidence: 97%

Impact of climate change on waterborne diseases

Funari

Manganelli

Sinisi

2012

Annali Dell'Istituto Superiore Di Sanità

View full text Add to dashboard Cite

show abstract

“…Previous studies have indicated that the transport of pollutants (e.g., heavy metals, radioactive pollutants, and organic matter) through subsurface environments is facilitated by colloids (Denaix et al, 2001;Hammes et al, 2013;Honeyman, 1999;Kersting et al, 1999;Pedrot et al, 2008;Roy and Dzombak, 1997;Wang et al, 2011a;Yin et al, 2010;Zhang et al, 2005). The generally accepted mechanism of colloid-facilitated pollutant transport was that the colloid acts as a carrier to adsorb the pollutant and thus promote pollutant transport (Kanti Sen and Khilar, 2006).…”

Section: Introductionmentioning

confidence: 99%

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Guo

Lei

et al. 2016

Environmental Pollution

View full text Add to dashboard Cite

a b s t r a c tTransport of environmental pollutants through porous media is influenced by colloids. Co-transport of As(V) and soil colloids at different pH were systematically investigated by monitoring breakthrough curves (BTCs) in saturated sand columns. A solute transport model was applied to characterize transport and retention sites of As(V) in saturated sand in the presence of soil colloids. A colloid transport model and the DLVO theory were used to reveal the mechanism and hypothesis of soil colloid-promoted As(V) transport in the columns. Results showed that rapid transport of soil colloids, regulated by pH and ionic strength, promoted As(V) transport by blocking As(V) adsorption onto sand, although soil colloids had low adsorption for As(V). The promoted transport was more significant at higher concentrations of soil colloids (between 25 mg L À1 and 150 mg L À1) due to greater blocking effect on As(V) adsorption onto the sand surfaces. The blocking effect of colloids was explained by the decreases in both instantaneous (equilibrium) As adsorption and first-order kinetic As adsorption on the sand surface sites. The discovery of this blocking effect improves our understanding of colloid-promoted As transport in saturated porous media, which provides new insights into role of colloids, especially colloids with low As adsorption capacity, in As transport and mobilization in soil-groundwater systems.

show abstract

“…Several recent studies have illustrated the mobilization of organic matter in response to increases in pH (Grybos et al, 2007(Grybos et al, , 2009 with some documenting colloidal forms of organic matter (Pédrot et al, 2008(Pédrot et al, , 2011Thompson et al, 2006a). We found that increasing the pH of all three of our Hawaiian soils through addition of KOH resulted in greater release of nanoparticulate (2.3-60 nm) and dissolved C, but the amount of colloid-bound (60-430 nm) C was minimally affected (Fig.…”

Section: Mechanisms Of Colloidal Carbon Mobilizationmentioning

confidence: 56%

Depth and character of rock weathering across a basaltic‐hosted climosequence on Hawai‘i

Goodfellow

Chadwick

Hilley

2013

Earth Surf Processes Landf

View full text Add to dashboard Cite

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. The transport of organic carbon (C) to deep mineral horizons in soils can lead to long-term C stabilization. In basaltic soils, C associations with short-range-ordered (SRO) minerals often lead to colloid-sized aggregates that can be dispersed and mobilized by changes in soil solution chemistry. In the montane forest region of Hawaii, basaltic soils are exposed to high rainfall and anoxic conditions that facilitate ferric (Fe III ) (oxyhydr)oxide reduction. We explored the potential of iron (Fe)-reducing conditions to mobilize C by exposing the surface mineral horizons of three soils from the Island of Hawai'i (aged 0.3, 20, and 350 ky) to 21 days of anoxic incubation in 1:10 soil slurries. Mobilized C was quantified by fractionating the slurries into three particle-size classes (b430 nm,b 60 nm,b2.3 nm ≈ 10 kDa). In all three soils, we found Fe reduction (maximum Fe 2+ (aq) concentration ≈ 17.7 ± 1.9 mmol kg −1 soil) resulted iñ 500% and~700% increase of C in the 2.3-430 nm, and b 2.3 nm size fractions, respectively. In addition, Fe reduction increased solution ionic strength by 127 μS cm −1 and generated hydroxyl ions sufficient to increase the slurry pH by one unit. We compared this to C mobilized from the slurries during a 2-h oxic incubation across a similar range of pH and ionic strength and found smaller amounts of dissolved (b 2.3 nm) and colloidal (2.3-430 nm) C were mobilized relative to the Fe reduction treatments (p b 0.05). In particular, C associated with the largest particles (60-430 nm) was dispersed almost exclusively during the Fe reduction experiments, suggesting that it had been bound to Feoxide phases. Our experiments suggest that colloidal dispersion during Fe-reducing conditions mobilizes high concentrations of C, which may explain how C migrates to deep mineral horizons in redox dynamic soils.

show abstract

Insights into colloid-mediated trace element release at the soil/water interface

Cited by 145 publications

References 56 publications

Impact of climate change on waterborne diseases

Impact of climate change on waterborne diseases

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Depth and character of rock weathering across a basaltic‐hosted climosequence on Hawai‘i

Contact Info

Product

Resources

About