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Degradation of nitroaromatic herbici...

Klupinski, Theodore Paul.

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Degradation of nitroaromatic herbicides in wetland sediments.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Degradation of nitroaromatic herbicides in wetland sediments./
Author:	Klupinski, Theodore Paul.
Description:	112 p.
Notes:	Adviser: Yu-Ping Chin.
Contained By:	Dissertation Abstracts International63-04B.
Subject:	Agriculture, Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3049053
ISBN:	0493634436

Degradation of nitroaromatic herbicides in wetland sediments.
Klupinski, Theodore Paul.

Degradation of nitroaromatic herbicides in wetland sediments. - 112 p.

Adviser: Yu-Ping Chin.

Thesis (Ph.D.)--The Ohio State University, 2002.

Contamination of surface waters and sediments from nonpoint sources is a major environmental concern. Pesticides and herbicides contribute significantly to this problem due to their widespread usage on agricultural land, from which they can be transported by surface runoff. In wetlands and lakes, these compounds may exhibit a variety of behaviors, including degradation, persistence in the water column, or sorption to sediments. As many pesticides/herbicides may pose toxic risks, it is important to understand the factors that influence the fate of these contaminants in surface waters. This dissertation discusses the role of abiotic reactions in the sediment-mediated degradation of two nitroaromatic herbicides: trifluralin (2,6-dinitro-<italic>N,N</italic>-dipropyl-4-(trifluoromethyl)benzenamine) and pentachloronitrobenzene (C6Cl5NO2).

ISBN: 0493634436Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Degradation of nitroaromatic herbicides in wetland sediments.
LDR:03604nam 2200361 a 45 001 928262
005 20110426
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020 $a 0493634436
035 $a (UnM)AAI3049053
035 $a AAI3049053
040 $a UnM $c UnM
100 1 $a Klupinski, Theodore Paul. $3 1251725
245 1 0 $a Degradation of nitroaromatic herbicides in wetland sediments.
300 $a 112 p.
500 $a Adviser: Yu-Ping Chin.
500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1761.
502 $a Thesis (Ph.D.)--The Ohio State University, 2002.
520 $a Contamination of surface waters and sediments from nonpoint sources is a major environmental concern. Pesticides and herbicides contribute significantly to this problem due to their widespread usage on agricultural land, from which they can be transported by surface runoff. In wetlands and lakes, these compounds may exhibit a variety of behaviors, including degradation, persistence in the water column, or sorption to sediments. As many pesticides/herbicides may pose toxic risks, it is important to understand the factors that influence the fate of these contaminants in surface waters. This dissertation discusses the role of abiotic reactions in the sediment-mediated degradation of two nitroaromatic herbicides: trifluralin (2,6-dinitro-<italic>N,N</italic>-dipropyl-4-(trifluoromethyl)benzenamine) and pentachloronitrobenzene (C6Cl5NO2).
520 $a Laboratory reactions were conducted in mixtures of Fe(II) and goethite (α-FeOOH). Both herbicides reacted rapidly in the presence of 500 μM Fe(II) and 100 mg/L goethite at near-neutral pHs. These conditions are comparable to those that have been observed in natural sediments, suggesting the potential environmental relevance of these results.
520 $a In the Fe(II)/goethite media, trifluralin is degraded to yield at least eight intermediates and five products. The results revealed the occurrence of three distinct reaction pathways: reduction of nitro groups, dealkylation of propylamines, and cyclization to form benzimidazoles. The observed products have all been reported by others in field studies of trifluralin degradation, which was generally assumed to be a biologically mediated process.
520 $a C6Cl5NO2 reacted with Fe(II)/goethite to yield only the reduced product pentachloroaniline (C6Cl 5NH2). Extensive kinetics studies suggested that the reaction may be correlated with a distinct sorbed Fe(II) species, rather than with the total amount of sorbed Fe(II). Additionally, the reactions do not display true second-order kinetic behavior, indicating that the surface association of C6Cl5NO2 may affect the degradation rate.
520 $a Finally, C6Cl5NO2 was degraded in porewaters isolated from the sediments of a freshwater wetland. The measured rate constants are consistent with the hypothesis that Fe(II)/iron oxides promote the reaction. In total, the results of this research demonstrate that abiotic reactions in sediments may significantly influence the environmental fate of nitroaromatic herbicides.
590 $a School code: 0168.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Biogeochemistry. $3 545717
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Environmental Sciences. $3 676987
650 4 $a Hydrology. $3 545716
690 $a 0285
690 $a 0388
690 $a 0425
690 $a 0768
690 $a 0775
710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 63-04B.
790 $a 0168
790 1 0 $a Chin, Yu-Ping, $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3049053