Interactions Between Polycyclic Aromatic Hydrocarbons and Humic Substances in the Aqueous Phase and Bound to Clay Surfaces PDF Download
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Author: Kim David Jones
Publisher:
ISBN:
Category : Organic water pollutants
Languages : en
Pages : 384
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Author: Kim David Jones
Publisher:
ISBN:
Category : Organic water pollutants
Languages : en
Pages : 384
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 700
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Leonardite is a naturally occurring oxidized form of lignite coal that is rich in humic materials. It is collected during coal-mining procedures, as it is commonly found overlying coal seams. Humic substances have been shown to significantly enhance the aqueous solubilities of PAHs by acting as a surfactant, increasing the water solubility of the PAH and allowing the contaminants to enter the aqueous phase. The use of humic acids on contaminated soils has the potential to greatly enhance the solubility, and consequently the bioavailability, of PAHs allowing for an easier and more efficient bioremediation procedure. A fluorescence quenching method was used to determine the association constants (Kb) for various water-soluble humic materials and naphthalene. The objective of the microcosm study was to determine if a variety of dissolved humic material solution amendments could influence the biodegradation rate of selected PAHs, namely anthracene and benzo[a]pyrene, in a soil with previous exposure to PAHs. (Abstract shortened by UMI.).
Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 806
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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309086256
Category : Technology & Engineering
Languages : en
Pages : 433
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Bioavailability refers to the extent to which humans and ecological receptors are exposed to contaminants in soil or sediment. The concept of bioavailability has recently piqued the interest of the hazardous waste industry as an important consideration in deciding how much waste to clean up. The rationale is that if contaminants in soil and sediment are not bioavailable, then more contaminant mass can be left in place without creating additional risk. A new NRC report notes that the potential for the consideration of bioavailability to influence decision-making is greatest where certain chemical, environmental, and regulatory factors align. The current use of bioavailability in risk assessment and hazardous waste cleanup regulations is demystified, and acceptable tools and models for bioavailability assessment are discussed and ranked according to seven criteria. Finally, the intimate link between bioavailability and bioremediation is explored. The report concludes with suggestions for moving bioavailability forward in the regulatory arena for both soil and sediment cleanup.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: Thomas Donald Gauthier
Publisher:
ISBN:
Category :
Languages : en
Pages : 226
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Author: Yazmina Bryant
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author: Yazmina Bryant
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Andrew Lawrence Sayers-Fay
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
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