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Quantitation of bound pesticide resi...

Iowa State University.

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Quantitation of bound pesticide residues in field and wetland soils.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Quantitation of bound pesticide residues in field and wetland soils./
Author:	Wulf, Larry Warren.
Description:	242 p.
Notes:	Major Professors: James L. Baker; William G. Crumpton.
Contained By:	Dissertation Abstracts International62-11B.
Subject:	Agriculture, Soil Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3034238
ISBN:	0493470042

Quantitation of bound pesticide residues in field and wetland soils.
Wulf, Larry Warren.

Quantitation of bound pesticide residues in field and wetland soils. - 242 p.

Major Professors: James L. Baker; William G. Crumpton.

Thesis (Ph.D.)--Iowa State University, 2001.

A sequential extraction scheme was developed for the quantitation of extractable and bound pesticide residues in field and wetland soils. Extractable and bound fractions of pesticides in soil were measured in spiked field and wetland soils that were stored for periods of up to ninety days. Treatment conditions included microbiological control through the use of irradiated soil and biocide. Bound pesticide residue formation was also studied as affected by moisture level, dark and light storage, and concentration. The water column of wetland microcosms was dosed with pesticides to study sorption behavior of pesticides in intact wetland systems. Extractable pesticide degradation in soils could be described by first-order rate kinetics. Dissipation curves of extractable residues in soil and from the water column of wetland microcosms exhibited biphasic kinetic behavior. Bound pesticide formation was greater in soils exposed to light than samples stored in the dark. Bound pesticides in spiked wetland soils after ninety days of storage accounted for nearly all the pesticide present in the soil and represented a major fraction of the amount of initially added pesticide. The formation of bound pesticide residues occurs during the first few days of contact with the soil with a substantial amount of instantaneous formation of bound residues. The instantaneous formation of bound residues in soil favors a model of energetically favorable entrapment of pesticides within voids and micropores arising within aromatic rich portions of the structure of aggregated humic acids. A triangular model of pesticides in soil was developed between those pesticides in the aqueous soil solution phase, pesticides partitioned to the soil phase, and those pesticides in the bound fraction. Equations were developed that describe the concentration of bound pesticides in field and wetland soils upon initial soil contact and also the maximum concentrations of bound pesticides in the soil as a function of contact time.

ISBN: 0493470042Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Quantitation of bound pesticide residues in field and wetland soils.
LDR:02959nam 2200289 a 45 001 936299
005 20110510
008 110510s2001 eng d
020 $a 0493470042
035 $a (UnM)AAI3034238
035 $a AAI3034238
040 $a UnM $c UnM
100 1 $a Wulf, Larry Warren. $3 1259989
245 1 0 $a Quantitation of bound pesticide residues in field and wetland soils.
300 $a 242 p.
500 $a Major Professors: James L. Baker; William G. Crumpton.
500 $a Source: Dissertation Abstracts International, Volume: 62-11, Section: B, page: 4871.
502 $a Thesis (Ph.D.)--Iowa State University, 2001.
520 $a A sequential extraction scheme was developed for the quantitation of extractable and bound pesticide residues in field and wetland soils. Extractable and bound fractions of pesticides in soil were measured in spiked field and wetland soils that were stored for periods of up to ninety days. Treatment conditions included microbiological control through the use of irradiated soil and biocide. Bound pesticide residue formation was also studied as affected by moisture level, dark and light storage, and concentration. The water column of wetland microcosms was dosed with pesticides to study sorption behavior of pesticides in intact wetland systems. Extractable pesticide degradation in soils could be described by first-order rate kinetics. Dissipation curves of extractable residues in soil and from the water column of wetland microcosms exhibited biphasic kinetic behavior. Bound pesticide formation was greater in soils exposed to light than samples stored in the dark. Bound pesticides in spiked wetland soils after ninety days of storage accounted for nearly all the pesticide present in the soil and represented a major fraction of the amount of initially added pesticide. The formation of bound pesticide residues occurs during the first few days of contact with the soil with a substantial amount of instantaneous formation of bound residues. The instantaneous formation of bound residues in soil favors a model of energetically favorable entrapment of pesticides within voids and micropores arising within aromatic rich portions of the structure of aggregated humic acids. A triangular model of pesticides in soil was developed between those pesticides in the aqueous soil solution phase, pesticides partitioned to the soil phase, and those pesticides in the bound fraction. Equations were developed that describe the concentration of bound pesticides in field and wetland soils upon initial soil contact and also the maximum concentrations of bound pesticides in the soil as a function of contact time.
590 $a School code: 0097.
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Environmental Sciences. $3 676987
690 $a 0481
690 $a 0768
710 2 0 $a Iowa State University. $3 1017855
773 0 $t Dissertation Abstracts International $g 62-11B.
790 $a 0097
790 1 0 $a Baker, James L., $e advisor
790 1 0 $a Crumpton, William G., $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3034238