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Influence of metabolites and co-cont...

Vanderford, Mindy.

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Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils./
Author:	Vanderford, Mindy.
Description:	170 p.
Notes:	Adviser: Frederic K. Pfaender.
Contained By:	Dissertation Abstracts International62-11B.
Subject:	Biogeochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3031923
ISBN:	0493446362

Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils.
Vanderford, Mindy.

Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils. - 170 p.

Adviser: Frederic K. Pfaender.

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2001.

Soils contaminated with potentially carcinogenic polycyclic aromatic hydrocarbons (PAH's) also contain complex mixtures of co-contaminants. These compounds combined with the specific attributes of their deposition and location may effect the natural attenuation process and risk estimation for contaminated sites. Work presented in the following document illustrates the complexity of interactions between parent PAH compounds and possible co contaminants. A series of solvent spiking and soil moisture conditions were investigated for their impact on microbial response. Degradation and fate of pyrene was monitored in field-wet and air-dry and rehydrated soils using dichloromethane, acetone, ethanol or toluene as spiking solvents. Soils subject to ethanol solvent spikes exhibited total elimination of pyrene mineralization capacity and dramatically increased solvent extractability of pyrene. Other solvent spikes showed high, and largely similar, levels of pyrene mineralization. Additional tests of microbial response to solvent spiking included glucose turnover, culturable heterotrophs and DNA extractability. Results indicate that choice of soil spiking protocols can alter the response of the microbial community and degradation of the target compound.

ISBN: 0493446362Subjects--Topical Terms:

545717
Biogeochemistry.

Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils.
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020 $a 0493446362
035 $a (UnM)AAI3031923
035 $a AAI3031923
040 $a UnM $c UnM
100 1 $a Vanderford, Mindy. $3 1260219
245 1 0 $a Influence of metabolites and co-contaminants on the biodegradation of polycyclic aromatic hydrocarbons in soils.
300 $a 170 p.
500 $a Adviser: Frederic K. Pfaender.
500 $a Source: Dissertation Abstracts International, Volume: 62-11, Section: B, page: 5305.
502 $a Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2001.
520 $a Soils contaminated with potentially carcinogenic polycyclic aromatic hydrocarbons (PAH's) also contain complex mixtures of co-contaminants. These compounds combined with the specific attributes of their deposition and location may effect the natural attenuation process and risk estimation for contaminated sites. Work presented in the following document illustrates the complexity of interactions between parent PAH compounds and possible co contaminants. A series of solvent spiking and soil moisture conditions were investigated for their impact on microbial response. Degradation and fate of pyrene was monitored in field-wet and air-dry and rehydrated soils using dichloromethane, acetone, ethanol or toluene as spiking solvents. Soils subject to ethanol solvent spikes exhibited total elimination of pyrene mineralization capacity and dramatically increased solvent extractability of pyrene. Other solvent spikes showed high, and largely similar, levels of pyrene mineralization. Additional tests of microbial response to solvent spiking included glucose turnover, culturable heterotrophs and DNA extractability. Results indicate that choice of soil spiking protocols can alter the response of the microbial community and degradation of the target compound.
520 $a Simple aerobic soil microcosms were used to demonstrate the effect of identified PAH metabolic products on the rate, extent of degradation and final disposition of two high molecular weight PAH's. Data indicate that low concentrations of salicylic acid (50μg/g soil) have a mild stimulatory effect on mineralization of pyrene in soil. 4-hydroxybenzoic acid (4-HB) and protocatechuate have no effect on mineralization of pyrene. Pyruvate significantly inhibited pyrene mineralization. BAP mineralization was unaffected by salicylic acid and other compounds, but was inhibited by the presence of phenanthrene.
520 $a Toxicity, mobility and persistence of the oxidized metabolite pyrene-4,5-dione (P45D) were investigated in soil systems. Toxicity of P45D in saturated solution, as measured by Microtox, indicated an EC50 of 0.63 mg/L. Degradation of pyrene in the presence of P45D in spiked soil microcosms showed greatly reduced initial mineralization kinetics and significantly less total mineralization over 180 d. The presence of P45D had no effect on the mineralization and ultimate disposition of benzo[a]pyrene. Recovery of spiked P45D from soil microcosms indicated that 15 to 18% of the initial concentration of P45D could be solvent-extracted after treatment.
590 $a School code: 0153.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Environmental Sciences. $3 676987
690 $a 0425
690 $a 0768
690 $a 0775
710 2 0 $a The University of North Carolina at Chapel Hill. $3 1017449
773 0 $t Dissertation Abstracts International $g 62-11B.
790 $a 0153
790 1 0 $a Pfaender, Frederic K., $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3031923