Interaction of metals with mineral surfaces in a natural groundwater environment

Freedman, Yuri E.; Magaritz, Mordeckai; Long, Gary L.; Rönen, Daniel

doi:10.1016/0009-2541(94)90160-0

Cited by 18 publications

(4 citation statements)

References 29 publications

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“…Lead is another contaminant of concern in the Barton Springs Aquifer (Hauwert and Vickers, 1994). In the groundwater environment, the distribution coefficient of lead between minerals and groundwater ranges from about 30 to over 200, with sorption increasing as quartz Ͻ calcite Ͻ kaolinite (Freedman et al, 1994). Therefore while the clays have the greatest potential to sorb and transport lead, the mobile calcite and quartz sediment may also do so.…”

Section: Implications For Contaminant Transportmentioning

confidence: 99%

Muddy waters: temporal variation in sediment discharging from a karst spring

Mahler

Lynch

1999

Journal of Hydrology

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Karst aquifers are capable of transporting and discharging large quantities of suspended sediment, which can have an important impact on water quality. Here we present the results of intensive monitoring of sediment discharging from a karst spring in response to two storm events, one following a wet season and the other following a dry season; we describe temporal changes in total suspended solids (TSS), mineralogy, and particle size distribution. Peak concentrations of suspended sediment coincided with changes in aqueous chemistry indicating arrival of surface water, suggesting that much of the discharging sediment had an allochthonous origin. Concentrations of suspended sediment peaked 14-16 h after rainfall, and the bulk of the sediment (approximately 1 metric ton in response to each storm) discharged within 24 h after rainfall. Filtered material included brightly colored fibers and organic matter. Suspended sediments consisted of dolomite, calcite, quartz, and clay. Proportions of each mineral constituent changed as the aquifer response to the storm progressed, indicating varying input from different sediment sources. The hydraulic response of the aquifer to precipitation was well described by changes in parameters obtained from the particle size distribution function, and corresponded to changes seen in TSS and mineralogy. Differences between storms in the quantity and mineralogy of sediment transported suggest that seasonal effects on surface sediment supply may be important. The quantity of sediment discharging and its potential to sorb and transport contaminants indicates that a mobile solid phase should be included in contaminant monitoring and contaminant transport models of karst. Temporal changes in sediment quantity and characteristics and differences between responses to the two storms, however, demonstrate that the process is not easily generalized. ᭧

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Section: Implications For Contaminant Transportmentioning

confidence: 99%

Muddy waters: temporal variation in sediment discharging from a karst spring

Mahler

Lynch

1999

Journal of Hydrology

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“…On the basis of the laboratory microcosm experiments (Jahn 2005b), where it was found that the degradation of contaminants with Fe(III) reduction could be adequately described by a simple first‐order kinetic expression, the reaction of aqueous‐phase substrates with Fe(III) was represented in the model using first‐order kinetics. Aqueous phase Fe(II) ions produced by the reduction of Fe(III) minerals are known to take part in numerous secondary reactions such as precipitation as Fe(II) sulfides or reoxidation to Fe(III) (Tuccillo et al 1999; Vencelides et al 2007) and in ion exchange processes (Appelo et al 1999; Freedman et al 1994) that limit their transport away from areas where Fe(III) reduction is active. In the simulations, the complex geochemistry of Fe(II) was simplified to two processes: reoxidation of Fe(II) to Fe(III) in the presence of oxygen and a first‐order decay term applied to Fe(II) to represent the various other sink reactions.…”

Section: Model Setupmentioning

confidence: 99%

Multicomponent Simulations of Contrasting Redox Environments at an LNAPL Site

Miles¹,

Peter

Teutsch

2008

Groundwater

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A two-dimensional multicomponent reactive transport modeling approach was used to simulate contaminant transport and the evolution of redox processes at a large-scale kerosene-contaminated site near Berlin, Germany. In contrast to previous site-scale modeling studies that focused either on one or two contaminants or on steadystate redox conditions, multiple contaminants and electron acceptors, including mineral phase Iron (III), were considered with an evolving redox zonation. Inhibition terms were used to switch between the different electron acceptor processes in the reaction scheme. The transient evolution of redox zones and contaminant plumes was simulated for two separate transects of the site, which have different geology and ground water recharge distributions and where quite different downstream contaminant and terminal electron-accepting process (TEAP) distributions are observed. The same reaction system, calibrated to measured concentrations along one of the transects, was used in both cases, achieving a reasonable match with observed concentrations. The differences between the two transects could thus to some extent be attributed to the different hydrological and hydrogeological conditions, in particular ground water recharge distributions. Long-term simulations showed that the distribution of TEAPs evolves as Fe(III) becomes depleted, with conditions becoming increasingly methanogenic, leading to changes in contaminant plume lengths. The models were applied to assess the potential effects of planned changes in land use at the site that may affect the ground water recharge distribution. The simulated redox zonation responded strongly to changes in recharge, which in turn led to changes in the contaminant plume lengths.

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“…Silica minerals are abundant in the earth’s crust and very important to production and life. On the one hand, silica species have been extensively used in some industries, including catalysis products, electronic devices, optical instruments, and solar cells because of their unique properties. − On the other hand, as a group of significant minerals in soil and sediments, silica minerals exert unique effects on the interfacial reactions involving geochemical and environmental domains. − Adsorption of contaminants at the silica–solution interface is a vital part of the self-purification process of soil and sediments. Dye substances are well known to be widely used in many industries, such as textile, leather, dye, printing, food, and plastic industries, and also a major source of colored wastewater due to their unreasonable discharge .…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Heterogeneity of α-Quartz and α-Cristobalite on Adsorption of Crystal Violet

Tang

Dong

2021

ACS Omega

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Silica minerals are a kind of important minerals and widespread on the earth’s surface. They play an irreplaceable role in the whole geochemistry and environment processes. The diversity in the crystal structure of SiO 2 polymorphs might lead to the heterogeneity in their surface microstructures and properties. As two common SiO 2 polymorph minerals in soil and sediments, α-quartz and α-cristobalite have been studied for the effects of their surface heterogeneity on adsorption behaviors toward crystal violet (CV) by batch adsorption experiments in different specific surface areas (SSAs) and at different pH values and temperatures, as well as by X-ray photoelectron spectroscopy (XPS) investigation. Owing to the larger surface site density, the saturated adsorption amount of α-quartz was larger than that of α-cristobalite. It was also indicated by the larger slope of adsorption lines as a function of SSA. The adsorption capacity of both increased with increasing pH and temperature. In the thermodynamic study, the negative Δ G indicated that the adsorption of CV on the surface was spontaneous and the positive Δ H suggested that the reaction was endothermic. The well-fitted Langmuir adsorption isotherms suggested that the CV adsorption was monolayer adsorption. The adsorption interaction force was mainly involved in electrostatic attraction force between the negatively charged surface reactive sites and positively charged N atoms in the dimethylamino groups of CV. The XPS spectra of N 1s showed that the stoichiometric ratio of N low /N high changed from lower than 2:1 to about 2:1 as the adsorption changed from the unsaturated to saturated state. The change reflected that the spatial arrangement of adsorbed CV monomer on the mineral surface could be readjusted by lifting the average tilt angle between the average plane of the CV monomer and the sample surface during the adsorption process. Surface heterogeneity of α-quartz and α-cristobalite controlled the different distributions and postures of adsorbed CV monomers on the surface. The CV monomers adsorbed on α-quartz presented a larger average tilt angle because of its larger surface reactive site density, while α-cristobalite did conversely.

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Interaction of metals with mineral surfaces in a natural groundwater environment

Cited by 18 publications

References 29 publications

Muddy waters: temporal variation in sediment discharging from a karst spring

Muddy waters: temporal variation in sediment discharging from a karst spring

Multicomponent Simulations of Contrasting Redox Environments at an LNAPL Site

Effects of Surface Heterogeneity of α-Quartz and α-Cristobalite on Adsorption of Crystal Violet

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