Retardation of Toxic Chemicals in a Contaminated Outwash Aquifer

Patterson, Ronald J.; Jackson, Richard E.; Graham, B. W.; Chaput, D.; Priddle, M. W.

doi:10.2166/wst.1985.0082

Cited by 17 publications

(17 citation statements)

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“…The sorption of carbazole, dlbenzothiophene, and anthracene was investigated on hematite, kaolinite, and CP-clay that had been coated with either peat humic acid or Suwannee humic acid. In these experiments, fx values were varied over the range of 0.001-0.01 to encompass the organic carbon concentrations found in low-carbon groundwaters and aquifers (see organic carbon concentrations in refs [55][56][57][58][59]. Low-carbon mineral systems were emphasized because past investigations have shown that Kx-Kov/ relationships tend to deteriorate below an fx of 0.001 (1,16,60).…”

Section: Resultsmentioning

confidence: 99%

Influence of mineral-bound humic substances on the sorption of hydrophobic organic compounds

Murphy¹,

Zachara²,

Smith³

1990

Environ. Sci. Technol.

429

307

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The sorption of three hydrophobic organic compounds (HOC) was investigated on hematite and kaolinite that had been coated with natural humic substances over a mass percent carbon range of 0.01-O.5%. Increasing quantities of sorbed humic substances increased the sorption of HOC. Anthracene, the most hydrophobic HOC, showed the greatest sorption enhancement, while the most aromatic coating, peat humic acid, was the strongest sorbent. Depending on the type of humic acid coating and the mineral substrate, the experimental K , values were either higher or lower than those predicted by the Kow The sorptivity of a given humic acid for HOC was not the same on kaolinite and hematite, suggesting that the orientation and structure of the humic substance on the mineral may affect the surface area of the organic phase and the accessibility of hydrophobic domains that control HOC sorptivity. Sorption isotherms for HOC on the humic-coated mineral substrates were nonlinear, implying that the sorption phenomenon was adsorption onto rather than partitioning into the surface organic phase.

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Section: Resultsmentioning

confidence: 99%

Influence of mineral-bound humic substances on the sorption of hydrophobic organic compounds

Murphy¹,

Zachara²,

Smith³

1990

Environ. Sci. Technol.

429

307

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“…The danger posed by such chemicals to drinking water supplies has brought about the rapid growth in contaminant hydrogeology, the passing into law of much regulatory legislation, and the creation of numerous consulting and analytical businesses. Despite all this activity, few substantial descriptions of the occurrence and distribution of toxic organic contaminants in groundwater flow systems have appeared in print (1)(2)(3)(4)(5)(6)(7)(8)(9). Only a handful of these provide a detailed account of the analytical organic chemistry of the groundwater.…”

Section: Introductionmentioning

confidence: 99%

Occurrence and fate of organic solvent residues in anoxic groundwater at the Gloucester landfill, Canada

Lesage¹,

Jackson²,

Priddle³

et al. 1990

Environ. Sci. Technol.

127

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“…1,4-Dioxane has low sorption into soils because of its low octanol-water partition coefficient. Furthermore, several field and laboratory studies have confirmed that retardation factor of 1,4-dioxane in subsurface is very limited [8][9][10] . Like-…”

Section: Introductionmentioning

confidence: 94%

A New Approach for Prediction of 1,4-Dioxane Distribution in Groundwater at an Illegal Dumping Site in Japan

et al. 2013

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Dioxane migrates in groundwater with low sorption, low degradation, and low volatilization according to its physicochemical properties. 1,4-Dioxane migration therefore strongly depends on groundwater flow. Hydraulic conductivities, the most uncertain parameters and critical to groundwater flow, should be precisely determined. In a conventional approach, groundwater flow is estimated by calibration to optimize hydraulic conductivities, and then the calibrated groundwater flow is used for predicting 1,4-dioxane distribution considering other parameters such as source location and concentration. Although other parameters are properly set, 1,4-dioxane distribution cannot be always precisely predicted because the calibrated groundwater flow model does not perfectly present the real groundwater flow. Thus, the calibrated groundwater flow should be reevaluated to define the most suitable hydraulic conductivities considering 1,4-dioxane distribution. This study proposes a new approach with verification process of groundwater flow estimation for precisely predicting 1,4-dioxane distribution in groundwater. In this approach, several acceptable sets of hydraulic conductivities in term of groundwater heads are estimated by calibration and each groundwater flow is verified to match between calculated and observed 1,4-dioxane concentrations. The effectiveness of our new approach comparing to the conventional one was proved by a case study at an illegal dumping site in Japan where three aquifers have been contaminated by 1,4-dioxane for about 15 years. Eight acceptable sets of hydraulic conductivities of the three aquifers were determined by calibration using observed groundwater heads, and then verified to minimize the errors in 1,4-dioxane concentration. As a result, 1,4-dioxane distribution was predicted by our approach more precisely than the conventional approach.

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Retardation of Toxic Chemicals in a Contaminated Outwash Aquifer

Cited by 17 publications

References 0 publications

Influence of mineral-bound humic substances on the sorption of hydrophobic organic compounds

Influence of mineral-bound humic substances on the sorption of hydrophobic organic compounds

Occurrence and fate of organic solvent residues in anoxic groundwater at the Gloucester landfill, Canada

A New Approach for Prediction of 1,4-Dioxane Distribution in Groundwater at an Illegal Dumping Site in Japan

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