<i>A priori</i> simulation of tetrachloroethene transport through aquifer material using an intraparticle diffusion model

Young, Dirk F.; Ball, William P.

doi:10.1002/ep.670130112

Cited by 42 publications

(38 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on their results, monitor placement for underground diesel fuel storage systems can be improved. Tetrachloroethene transport through aquifer material using an intraparticle diffusion model was described by Young and Ball (1994). Model predictions were in agreement with column breakthrough data, supporting the hypothesis of intraparticle pore diffusion as a mechanism of slow sorption.…”

Section: Site Assessmentsupporting

confidence: 64%

Hazardous wastes: Assessment, management, minimization

Watts¹,

Nubbe²,

Hess³

1996

Water Environment Research

View full text Add to dashboard Cite

show abstract

Section: Site Assessmentsupporting

confidence: 64%

Hazardous wastes: Assessment, management, minimization

Watts¹,

Nubbe²,

Hess³

1996

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…Curtis et al (1986a) and Ball and Roberts (1991a) attributed the higher‐than‐predicted K oc values to the HOC sorption by mineral surfaces and/or unknown organic matter, whereas Allen‐King and Mackay (2000) explained their results using the dual‐mode sorption mechanisms. Alternatively, Ball (1990) and Young and Ball (1994)(1999) suggested that the Borden material may contain organic matter exhibiting high HOC sorption affinities.…”

Section: Resultsmentioning

confidence: 99%

Kerogen in Aquifer Material and Its Strong Sorption for Nonionic Organic Pollutants

et al. 2003

View full text Add to dashboard Cite

Sorption of organic pollutants by subsurface materials has been found to not only correlate with the total organic carbon (TOC) content, but also depend on the types of soil and sediment organic matter (SOM). Characterization of geochemically heterogeneous SOM is key to elucidating sorption mechanisms and predicting pollutant transport in ground water systems. In this study, kerogen, a nonextractable organic material, was isolated with an acid demineralization procedure from a sandy aquifer material (Borden, Ontario, Canada) having a TOC content of approximately 0.021% (w/w). Petrographical examinations reveal that the kerogen has three major types of macerals including bituminite (Kerogen Type I and II), vitrinite (Type III), and fusinite (Type IV or charred kerogen). The solid-state 13C nuclear magnetic resonance (NMR) spectrum shows two dominant peaks, aliphatic and aromatic carbons, for the isolated material. Sorption isotherms measured using phenanthrene, naphthalene, 1,3,5-trichlorobenzene (TCB), and 1,2-dichlorobenzene (DCB) as sorbates showed that both the isolated kerogen and the original sand exhibited nonlinear sorption and that the phenanthrene and TCB isotherms measured for the kerogen material are more nonlinear than the respective isotherms for the original sand. The single-point organic carbon--normalized sorption capacity measured for the isolated kerogen can be several times greater than that measured for the original sand for a given sorbate. The study suggests that kerogen plays a major role in overall sorption isotherm nonlinearity and could yield higher-than-predicted sorption capacities for the subsurface material even though the content of this organic material is very low.

show abstract

“…Sorption isotherms for the TCE and PCE with selected DAFB aquifer and aquitard materials were determined by means of batch experiments using 14C-labeled TCE or PCE in 10-mL flame-sealed vials, following the method of Ball and Roberts [1991b]; 14C-labeled analytes were obtained commercially from Sigma Chemical Co. (St. Louis, Missouri) and purified using an HPLC preparative technique described elsewhere [Young and Ball, 1994]. Mixing was continuous at 2 rpm, and equilibration times between 1 and 70 days were used.…”

Section: Sorption Isothermsmentioning

confidence: 99%

A diffusion‐based interpretation of tetrachloroethene and trichloroethene concentration profiles in a groundwater aquitard

Ball¹,

Liu²,

Xia³

et al. 1997

Water Resources Research

Self Cite

View full text Add to dashboard Cite

Abstract. Analysis of subsurface soil cores from the site of a field-scale groundwater remediation experiment at Dover Air Force Base, Delaware, has revealed that tetrachloroethene (PCE) and trichloroethene (TCE) contamination extends into an aquitard underlying a groundwater aquifer. The site location is well doWngradient of the locations of contaminant release, and the aquitard contamination is believed to have begun when contaminated groundwater first arrived in the overlying aquifer. Using independent estimates of sorption and diffusion properties in the aquitard layers, mathematical modeling based on diffusion in laminate slabs has been used to make inferences regarding the historical concentration conditions in the overlying aquifer. The results suggest that plume arrival occurred within the last two decades, with some important differences in the inferred TCE and PCE plume histories. The diffusion model was also applied toward predicting future aquitard concentrations and fluxes under scenarios based on the current condition as a starting point and hypothesized conditions of future groundwater cleanup. The results demonstrate how aquitard sampling and diffusion modeling can provide essential information relevant to forensic analysis, risk assessment, and subsurface cleanup. IntroductionClayey subsurface deposits are often of sufficiently low hydraulic conductivity that molecular diffusion is the dominant process of contaminant transport under many typically encountered conditions of hydraulic gradient [Barone el al., 1992; Johnson el al., 1989; Shackelford and Daniel, 1991]. As a consequence, the contamination of clay and silt aquitards underlying polluted aquifers may proceed primarily by this process, and subsequent remediation will be correspondingly slow. Investigations of contaminant diffusion in aquitards can help us to understand the effect of this rate-limiting process on remediation time and can also provide important clues regarding the contamination history of the overlying groundwater.Organic contaminant diffusion i n low-permeability materials has been studied previously iri the context of clay landfill liners or cutoff barriers, using both laboratory experiments [Barone el al., 1992; Molt and Weber, 1991] and field diffusion profiles [Johnson el al., 1989]. Johnson el al. [1989] have reviewed some of the literature related to solute diffusion through clay liners and other low-permeability materials underlying landfill sites and provide compelling evidence that simple Fickian diffusion can be an important mechanism of vertical contaminant transport in many field situations. These authors were among the first to investigate in situ diffusive transport through field material, which they accomplished by means of pore-water analyses from squeezed sections of core taken from directly below a 5-year-old landfill. Results were successfully modeled on the basis of the known exposure time, using the diffusion coefficient as a fitting parameter. Diffusion coefficients of organic Copyright 1997 by the ...

show abstract

A priori simulation of tetrachloroethene transport through aquifer material using an intraparticle diffusion model

Cited by 42 publications

References 25 publications

Hazardous wastes: Assessment, management, minimization

Hazardous wastes: Assessment, management, minimization

Kerogen in Aquifer Material and Its Strong Sorption for Nonionic Organic Pollutants

A diffusion‐based interpretation of tetrachloroethene and trichloroethene concentration profiles in a groundwater aquitard

Contact Info

Product

Resources

About