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Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry./
作者:	Maizel, Andrew Chapin.
面頁冊數:	1 online resource (327 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.
標題:	Environmental engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369735178

Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry.
Maizel, Andrew Chapin.

Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry. - 1 online resource (327 pages)

Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2017.

Includes bibliographical references

The irradiation of dissolved organic matter (DOM) produces reactive intermediates, such as excited triplet states of dissolved organic matter (3DOM), which contribute to the degradation of environmental contaminants. An understanding of how DOM composition determines the production of reactive intermediates is useful for predictions of contaminant fate and for relating the environmental processing of DOM to its photochemistry.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369735178Subjects--Topical Terms:

557376
Environmental engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry.
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245 1 0 $a Relating Dissolved Organic Matter Composition and Photochemistry with High Resolution Mass Spectrometry.
264 0 $c 2017
300 $a 1 online resource (327 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-09(E), Section: B.
500 $a Adviser: Christina K. Remucal.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2017.
504 $a Includes bibliographical references
520 $a The irradiation of dissolved organic matter (DOM) produces reactive intermediates, such as excited triplet states of dissolved organic matter (3DOM), which contribute to the degradation of environmental contaminants. An understanding of how DOM composition determines the production of reactive intermediates is useful for predictions of contaminant fate and for relating the environmental processing of DOM to its photochemistry.
520 $a To compare the reactivity of common 3DOM probe compounds, the photoreactivity of diverse, environmentally relevant waters was quantified with trans,trans-hexadienoic acid, 2,4,6-trimethylphenol, and furfuryl alcohol under ambient and standardized conditions. Measurements with each probe, including apparent quantum yields and pseudo-steady state concentrations, were found to exhibit unique sensitivities to variation in solution conditions. Comparisons of apparent quantum yields under standardized conditions suggest that the probe compounds each react with different 3DOM populations.
520 $a 3DOM photoreactivity varies with molecular weight, but the underlying mechanisms are unclear. Therefore, the photochemistry and composition of ultrafiltration-fractionated fulvic acid isolates were compared with reactive intermediate probes compounds and Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). Terrestrially derived DOM was increasingly aromatic with molecular weight, while microbially derived DOM was invariant. 3DOM pseudo-steady state concentrations decreased with molecular weight due to increased 3DOM quenching, rather than variation in 3DOM formation rates.
520 $a In order to relate DOM processing in natural systems to altered composition and photoreactivity, DOM from related lakes of different trophic status was evaluated with FT-ICR MS and reactive intermediate probe compounds. The presence of highly aromatic formulas, similar to lignin and tannin, correlated with 3DOM formation and light absorbance. Conversely, aliphatic formulas correlated with enhanced 3DOM quantum yields and environmental persistence.
520 $a To investigate the unique composition and photochemistry of DOM from aquatic microbial sources, DOM from a wastewater treatment plant was evaluated by FT-ICR MS and UV-visible spectroscopy. Wastewater DOM contained molecular formulas that were compositionally similar to lipids, proteins, carbohydrates, and lignin, and were enriched in heteroatoms such as N, S, P, and Cl. Secondary treatment increased highly aromatic formulas and increased the number of identified heteroatom containing formulas, while other treatment stages produced smaller changes in DOM composition.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Environmental engineering. $3 557376
650 4 $a Environmental science. $3 1179128
655 7 $a Electronic books. $2 local $3 554714
690 $a 0775
690 $a 0768
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Wisconsin - Madison. $b Civil and Environmental Engr. $3 1185690
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10276964 $z click for full text (PQDT)