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Dissolved organic matter--nonionic p...

Lee, Dar-Yuan.

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Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter./
Author:	Lee, Dar-Yuan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1988,
Description:	93 p.
Notes:	Source: Dissertation Abstracts International, Volume: 50-02, Section: B, page: 4810.
Contained By:	Dissertation Abstracts International50-02B.
Subject:	Environmental science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8909873

Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter.
Lee, Dar-Yuan.

Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter. - Ann Arbor : ProQuest Dissertations & Theses, 1988 - 93 p.

Source: Dissertation Abstracts International, Volume: 50-02, Section: B, page: 4810.

Thesis (Ph.D.)--University of California, Riverside, 1988.

This research was conducted to characterize the interaction between dissolved organic matter (DOM) and nonionic pesticides and to investigate the influence of DOM on the sorption of nonionic pesticides by clay and soil.Subjects--Topical Terms:

677245
Environmental science.

Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter.
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100 1 $a Lee, Dar-Yuan. $3 3283815
245 1 0 $a Dissolved organic matter--nonionic pesticide interactions and nonionic pesticide sorption by clay and soil as influenced by dissolved organic matter.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1988
300 $a 93 p.
500 $a Source: Dissertation Abstracts International, Volume: 50-02, Section: B, page: 4810.
500 $a Chairperson: Walter J. Farmer.
502 $a Thesis (Ph.D.)--University of California, Riverside, 1988.
520 $a This research was conducted to characterize the interaction between dissolved organic matter (DOM) and nonionic pesticides and to investigate the influence of DOM on the sorption of nonionic pesticides by clay and soil.
520 $a Equilibrium dialysis was used to determine the interaction of DOM from various sources with five nonionic pesticides of varying hydrophobicity. The association-dissociation of napropamide, a relatively polar, nonionic pesticide, with DOM was emphasized. Results indicated that hydrophobicity of nonionic pesticides alone cannot account for their interaction with DOM. When comparing DOM from different sources, dissolved humic acid had a higher affinity than dissolved fulvic acid for napropamide, DDT, and lindane. The extent of interaction between napropamide and peat dissolved humic acid was reduced with increasing ionic strength, increasing charge on cations added to the solution, and decreasing pH. The association of napropamide with DOM was not fully reversible, suggesting the possibility of a stable association being formed. In addition, DOM released from two separate soils each showed a different affinity for napropamide compared to bulk soil organic matter when the ability of the whole soil to retain napropamide was expressed on the organic matter content basis.
520 $a The batch equilibration method was used to investigate the sorption of napropamide by clay and soil as influenced by the presence of DOM. Sorption of napropamide by montmorillonite was decreased by the addition of DOM. In addition to the effect on sorption exerted by the association of napropamide with DOM in the solution phase, an interaction between DOM and montmorillonite was also involved. When Tujunga soil was used as the sorbent in a higher sorbent concentration relative to that in the montmorillonite system, the effect of reduced napropamide sorption was not observed due primarily to the sorption of added DOM by soil solids and partly to the low amount of DOM added compared to the native DOM in the soil. A reduction in napropamide sorption by two soils was observed when the soil pH was increased. The effect can be partly attributed to the association of DOM, released from native organic matter as caused by increasing pH, with napropamide.
520 $a The conclusions from this study are that the interaction between DOM and nonionic pesticides is a function of the chemical nature of the pesticides, properties of DOM, and solution chemistry. The effect of DOM on the sorption of nonionic pesticides by soils and sediments is more complex than simply the effect exerted by the interaction of DOM with pesticides in the solution phases. Interaction between DOM and the solid adsorbents must also be considered.
590 $a School code: 0032.
650 4 $a Environmental science. $3 677245
650 4 $a Agricultural chemistry. $3 523947
650 4 $a Agronomy. $3 2122783
690 $a 0768
690 $a 0749
690 $a 0285
710 2 $a University of California, Riverside. $3 791122
773 0 $t Dissertation Abstracts International $g 50-02B.
790 $a 0032
791 $a Ph.D.
792 $a 1988
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8909873