Colloid-facilitated Pb transport in two shooting-range soils in Florida

Yin, Xianqiang; Gao, Bin; Lena, Q.; Saha, Uttam Kumar; Sun, Huimin; Wang, Guodong

doi:10.1016/j.jhazmat.2009.12.077

Cited by 92 publications

(28 citation statements)

References 37 publications

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“…And the main colloid Sb was Sb(III) and the colloid mainly composed of Fe-oxides (Fe weight percentage 8.69%) which was analyzed by SEM-EDS. Earlier studies have indicated that colloid is an important factor influence heavy metals transport in soils [41,42]. Huanjiang soil has a larger adsorption capacity than Yingtan soil, which is consistent with the result of isotherms experiment (Table 1).…”

Section: Breakthrough Curvessupporting

confidence: 89%

Kinetic modeling of antimony(III) oxidation and sorption in soils

Cai

Zhang

2016

Journal of Hazardous Materials

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Section: Breakthrough Curvessupporting

confidence: 89%

Kinetic modeling of antimony(III) oxidation and sorption in soils

Cai

Zhang

2016

Journal of Hazardous Materials

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“…[11] Several studies have also shown that flow rate and solution ionic strength (IS) also have strong impact on the fate and transport of heavy metals in soils. [12,13] Mobile soil colloids have been extensively studied in recent years because of their role in contaminant transport through soils and groundwater. [14] Colloid facilitated transport of heavy metals in soils has also been reported [15][16][17] and it has been recognized as one of the most important mechanisms governing the mobility of heavy metals in soils, and thus has attracted much attention.…”

Section: Column Experimentsmentioning

confidence: 99%

Transport of vanadium (V) in saturated porous media: effects of pH, ionic-strength and clay mineral

Wang

Yin

Sun

et al. 2016

Chemical Speciation & Bioavailability

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Vanadium, a hazardous pollutant, has been frequently detected in soil and groundwater, however, its transport behavior in porous media were not clearly understood. In this study, the effects of solution pH, ionic strength (IS) and the effect of clay mineral on the transport of vanadium in saturated porous media were investigated. Laboratory experiments using a series of columns packed with quartz sand were carried out to explore the retention and transport of vanadium with a range of ionic-strength (0.001-0.1 M) and pH (4-8) and two different types of clay minerals montmorillonite and kaolinite. Results of the breakthrough experiments showed that vanadium was highly mobile in the saturated porous media. The increase in pH rendered a higher transport of vanadium in saturated porous media. The study also indicated an easier transfer of vanadium with an increase in IS. Montmorillonite enhanced the mobility of vanadium in the column when compared to kaolinite. A mathematical model based on advectiondispersion equation coupled with equilibrium and kinetic reactions was used to describe the retention and transport of vanadium in the columns very well.

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“…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

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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.

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Colloid-facilitated Pb transport in two shooting-range soils in Florida

Cited by 92 publications

References 37 publications

Kinetic modeling of antimony(III) oxidation and sorption in soils

Kinetic modeling of antimony(III) oxidation and sorption in soils

Transport of vanadium (V) in saturated porous media: effects of pH, ionic-strength and clay mineral

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

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